Tag Archives: charge controller

Friday 30th October 2015 – ALL GOOD THINGS …

… come to an end. And today, the home-made 12-volt immersion heater that I use as a dump-load for the excess solar energy finally ground to a halt.

Mind you, I’m not surprised. What has surprised me is that it lasted as long as it has – about 4 years if I remember correctly. It’s a 500-watt industrial 12-volt water heater element that I can pick up by the dozen in the USA, fitted into the side of a 25-litre plastic storage box and sealed in with rubber gaskets, and a simple tap. The whole lot is stood on a thick sheet of polystyrene insulation, with some of this thick space-blanket insulation wrapped around it, and a plastic lid covered with an off-cut of a sheet of polystyrene-backed plaster-board. Down on the inside of the space-blanket insulation up against the plastic side is the sensor of a maximum-minimum thermometer.

It’s wired in (with a 70-amp fuse) to a 60-amp Solar charge controller that I have reverse-wired so that instead of being “on” and switching off when the batteries are fully-charged, it’s “off” and switches on when the batteries are fully charged – and so when the batteries are fully charged and the charge controllers on the batteries switch off, the current that would otherwise be lost is diverted down into the water heater element and so heats up the water in the immersion heater for washing up, washing, and all that kind of thing.

And so why did it all go wrong?

The answer is that it hasn’t really gone wrong. A year or so ago I noticed that the positive wire to the immersion heater was heating up dramatically, and so I rewired it. But the thread stripped in the connection on the element so I had to find a small nut and bolt. But I couldn’t really fit a spanner into it so that it wasn’t particularly tight.

Today, I went downstairs to the fridge to fetch something to drink, and I could smell the burning plastic. There was something or a record of 37 amps going down the cables and this was simply too much for the bad joint and the wire was so hot that it was melting the insulation.

I hadn’t designed it particularly well – I can do much better than this, and in any case I don’t have any rubber joints for the element which I’ll need to take out and remake the joint, and so that’s a task for next week if I remember to buy the things that I need tomorrow at the shops. However, I have plugged the fridge back in so that something is being done about the excess current.

And so what else have I done today?

Apart from work on the laptop, which you can take as read, I’ve been tracking down some wood. I went to rescue the wooden box that I used to use to keep my fruit and vegetables in, but I pinched it last year to store my potatoes. But that didn’t work as the potatoes all went off and the wooden box is ruined (but I did in passing cast an eye on last year’s compost and it’s brewing beautifully!) and so I need to make another one.

I found a 50cm pine plank and some 40mm aluminium angle and I’ll be using that on Monday to make my new fruit and veg box.

As well as that, I went to check over the Kubota mini-digger. The reason for that is that the battery in the Kubota tractor is finished and I need a new one, so if I’m ordering one it makes sense to order a second for the digger – after all, that hasn’t run since the end of November last year.

But much to my astonishment, the mini-digger fired up straight away with no difficulty. And so I checked it over and left it running for a good hour or so to warm everything up and top up the battery.

I spent some time downstairs tidying up the ground floor too. It’s now looking as if you might be able to see the floor if I keep up like this. But I need to make a great deal of room as pretty soon I’ll be starting work down there and I’ll need the space.

Last but not least, I had a shower. 33°C in the verandah and 59°C in the 12-volt immersion heater, and so I cleared a corner of the verandah, fetched a bucket of hot water with some cold mixed in, found the pouring jug, and hey presto! Now I smell like coconut. I finished it off with a shave too, so now I’m all ready for the weekend.

But I could have done with a shave and a shower last night, as I was on my travels again. It was Marianne who had the pleasure of my company, going to the airport for a flight to Portugal. At the last minute she asked why I didn’t come with her, so with three hours to go before take-off I nipped off to my apartment for some clothes and the like, and to run one or two errands.

Once I’d done all of that, I had to return to the airport so there I was, driving through North London (flitting in and out of another nocturnal ramble from ages ago) on my way to Brussels Airport. The road was certainly very familiar to me, but I wasn’t convinced that it was the road that I should have been taking. But I arrived at the airport and reached the security gate with just 15 minutes to take-off and I still had a long way to go, not to mention passing through the “security”. And here I was, panicking in case I missed the flight, which was looking more and more likely as time passed by.

0

Tuesday 2nd December 2014 – REMEMBER THE OTHER DAY …

… when i said that I reckoned that winter was just around the corner?

1st snow winter 2014 les guis virlet puy de dome franceWell, I wasn’t wrong. At about midday today it started to snow – the 1st snow of winter 2014/15.

It might not look like much, but it snowed steadily throughout the afternoon and when I knocked off at 18:00 there was a think layer that was doing its best to stick. And had it been light, I would have taken a better photo of it.

I wonder what it’s going to be like tomorrow morning.

portable power board les guis virlet puy de dome franceI finished off the portable power board this morning. Well, it’s almost finished because it needs a backing on it to keep the cables and the backs of the sockets covered up.

There’s the inverter on there of course, a 600 watt one, together with an electric meter and a timer. Then we have three types of socket – a pair of 12-volt sockets, a single European 230 volt socket, and a pair of UK 230 volt sockets.

Regular readers of this rubbish will recall that I use British plugs and sockets on my 230 volt system because the plugs are fused, and that’s a useful thing to have.

This afternoon, I started on the new power board in the barn down at the southern end.

The bad news is that I dropped my Ryobi Plus One handlamp and broke it. That’s a tragedy because it’s the best light that I’ve ever had and I shall miss it very much.

The good news is that the power board is up and in position. The Xantrex charge controller that works the bank of solar panels is installed, and that wasn’t as easy as it might have been. I forgot how rigid the ware was and it took me ages to bend it into position and thread it through the series of holes through which it needs to pass.

Threading the wires through for the wind turbine was easier, and that’s in place together with the meter that reads the voltage and the amount of charge.

There was an hour left and so I settled down to connect up the new batteries to the system.

And here’s a thing.

Which company sells batteries that take a certain size of bolt that is supplied, so you can look at it and know which size of battery cable to order – and then sells you a meter that works off a shunt connected to the negative lead between the battery and the grounding circuit – and which takes a larger bolt?

Of course, you can’t buy battery leads with different-sized terminals on each end, so tomorrow I’m going to have to cut one lead in half and solder larger terminals onto the cut end. And my soldering is rubbish too.

I have to say that I’m not at all impressed with this company

With the snow, I lit the fire again tonight and made a mega-aubergine-and-kidney-bean whatsit. There’s enough in there for four days as usual and tonight’s helping tasted really nice. Somehow, cooking in the oven tastes so much better.

-2

Wednesday 12th March 2014 – NO PHOTOS TODAY, PEOPLE.

Yes, you can tell that I’m back home. And nothing exciting ever seems to happen around here and I never seem to do anything worth recording, especially as, having disconnected all of the alarms today, it was … errr … 12:20 when I crawled out of bed.And if it weren’t for the fact that I needed to visit the beichstuhl I would probably still be in bed right now.

It usually takes me a day or so to recover from a journey such as yesterday’s (I’m not as young as I used to be) and so a day of rest isn’t such a surprise really. And there was such a lot going on through the night (and the morning) that most of it slipped through my fingers. But I do recall running some kind of detective agency such as that of Hercule Poirot, and I had three girls working for me. The youngest was telling all of us about a superb proposition that had come her way and how it was going to make her a fortune, but it was the kind of proposition that had “SCAM” written right across it in illuminated capital letters and I really thought that, having worked for me for three years, she would know better than to fall for something like this.

I didn’t quite do nothing though. With over 160 amp-hours of surplus electricity by 15:00, water temperature in the home-made 12-volt immersion heater off the gauge and temperature of 34°C in the verandah, I treated myself to the second electrically-heated shower of the year.

And not only that, there was enough hot water left for a shave too and for the washing up as well. And there was enough of that seeing as how I made a mega-lentil-and-green-pepper curry. On the gas stove too. The temperature up here in the attic topped 20°C today – a waste of time lighting the woodstove – I’d be burnt out of the room before the stove was hot enough to cook on

And do you remember the charge controller that packed up last year and mysteriously started up the other week? Well, it’s just as mysteriously stopped again..

-3

Tuesday 11th February 2014 – I DIDN’T FIND …

… my tile cutter today, but I found something else instead.

tiling window sill head of stairs les guis virlet puy de dome franceQuite a few years ago I was at a car boot sale at Hexham with Dave Boustead (whatever happened to him?) and amongst the objects that I picked up was an ancient Rawlplug electric tile-cutter, for a couple of quid if I remember correctly.

And this morning, we had bright blue skies and not a cloud in sight and fully-charged batteries by 11:00 and so after I’d put the second coat of varnish on the wood that I’ve been fitting, I wheeled out the tile cutter.

It needed cleaning and a little oiling and so on but to my surprise once I’d loaded it up with water we were off. I did a few test cuts and then set about the tiles.

There are loads of design faults with this machine – I can think of a hundred ways to improve it – but it did the job as I asked it to do and, to be honest, it cut them better than I could have done. So no complaints from me.

By lunchtime, they were all cut and cemented to the window sill. All they need now is to be grouted and I really do wish that I had done the window in here like this now.

This afternoon, I started on the definitive version of the stairs to the attic. When I built them in 2009 I was constrained by time and also by the width (60cms) of the wood that I had at hand. None of this now though. High time I did them properly using real wood and with real rails.

This means, in effect, removing the rails, cutting them down so that they fit behind the plasterboard that I’ll be fitting, and then cutting up floorboarding to 67cms which, apart fom giving me three strips to a length of 2m, fits perfectly upon the new rails.

It’s taking me ages to do this as you might expect, but it looks much better than scrap chipboard and the like, and takes my weight so much better..It’s looking much better already and there’s only one tread fitted so far.

With a brief interruption for rain (i had to fecth in the washing) I was well away when knocking off time came round.

I’m clearly enjoying myself.

And while I’m on the subject, the Xantrex charge controller in the barn, the one that packed up last autumn, has now miraculously sprung into life.

-2

Sunday 17th November 2013 – NO FOOTY … GRRRRRR!

And I checked before setting out, too. I rang up Fabien who has now taken over the running of FC Pionsat St Hilaire from Bernard, so I am given to understand, and he said at first that today’s 2nd XI match at Charensat was on. But shortly afterwards, he rang back to say that following a mid-morning pitch inspection, the game was off.

Seeing as it was Sunday, I wasn’t feeling too much like a 13:00 start anyway, especially as I didn’t crawl out of bed until abou 10:30. So that was the cue for a leisurely morning.

The afternoon gave me several possibilities – I could see if there were any clubs in the vicinity (Le Quartier, the Goatslayers, St Maurice etc) were playing, or whether Terjat or St Marcel’s matches were on, or else I could stay in and do the rock programmes for Radio Anglais. Common sense and logic suggested that I did the radio programmes and so for once, I took my own best advice (not like me, I know) and dashed out January’s rock music. So that’s out of the way.

This evening I was summoned to appear chez Liz and Terry so that Liz and I could do the rehearsals for our recordings on Friday, and I could have a quick glance at the Fiat Punto that has ground to a shuddering halt (might possibly be that a big end cap has come off, although it’s significant that it started to go wrong after a local garage changed the water punp – has someone dropped a bolt or a spanner down a waterway?)

Liz also sprung a surprise on me – could I help her translate some technical information about the work that is done in a casting foundry. That 18 months I spent in an in-depth study of the evidence of the Tay Bridge disaster, during which about 100 pages was spent in discussing foundry practice and principles, stood me in good stead here, that’s for sure. And I’m not really complaining because Liz also sprung on me an apple crumble and vegan custard together with a doggy bag to take home, as well as another supply of vegan cheese from the UK.

On the way there though, I noticed rather ominously that the sides of the Puy-de-Dome, the Mont Dore and the Puy de Sancy are well-covered in snow. Winter is drawing inexorably closer with every day.

I’m also having a little change of procedure about the bateries in the barn right now. As you know, the charge controller has packed up in there (the second in as many years) so I’m by-passing the charge controller with a flying lead with crocodile clips on each end. Anyway, the battery that I’m using is fully-charged and I don’t want to overcharge it by leaving it coupled up all day, but before all of these charge control issues there were three batteries that were, well, not too bad, and they gradually lost their charge in the absence of a charge conroller.

What I’m doing then is to charge up for just half an hour the battery that’s there, and then swap over the charge to the three precious ones. If we have a good week or so of decent weather it might actually put some charge in them. Who knows? But it’s worth a try.

-13

Tuesday 12th November 2013 – GOD, IT WAS HARD …

… getting out of bed this morning. It took me a good half-hour to finally show a leg; And although the sky had clouded over during the night, it was still pretty cold.

Anyway after breakfast, it was time to restart work for the first time for ages, and it was the turn of the lean-to outside to receive my attention – but not before I’d hooked up the crocodile-clip wire across the terminals of the charge controller in the barn so that the battery there will receive some charge.

By lunchtime I’d finished cleaning out the front part of the lean-to and making it look something-like in there, and I’d also collected some wood that was lying around, ready for the fire if I light one tonight.

However, a major issue at lunchtime was that the boulangère didn’t call with the bread, and wasn’t answering her ‘phone either. That meant a quick nip into Pionsat for a load of bread before I could have a butty, and then much to my surprise I crashd out for an hour afterwards.

Once I’d gathered up my wits (doesn’t take long – I don’t have many) I went outside and started to attack the garden. I’ve fought my way down to where the old cars are, and then I made a start on weeding the pathway down to the bottom of the garden and I was well on my way with that when the light disappeared. 18:00 hours or so, and so I did a few little jobs and then came up here to watch a film.

Of course, I can’t sleep now so I dunno what will happen next, but tomorrow’s plan is to clear some space in the barn by the battery box, and then to continue the weeding of the pathways.

We shall see.

-7

Monday 11th November 2013 – IT’S REMEMBRANCE DAY TODAY …

… which is a Bank Holiday here in France, and so I remembered to switch off the alarm and have another lie-in. It’s been a while since I’ve had a proper Bank Holiday day off.

It dropped below freezing point last night outside too, the first time at this end of the year, and I’m not surprised because it was a glorious day today – not a cloud in the sky. There was 134 amp-hours of surplus solar energy too and so the home-made electric 12-volt immersion heater that I use as a dump load was in action again.

I had a nice leisurely morning tidying up a load of files on the computer and then carried out what is probably the most disagreeable task that happens round here, and that is to empty the composting toilet. Down at the composting bin, the first time for probably 6 months or something, I was well-impressed. What had been a horrible soggy mass of I don’t quite know what (well I do, but this is a family website) I was greeted by a nice dark brown earthy, crumbly soil mixture. So that is clearly working.

I’m also having charging issues in the barn, and have been for quite some time. The Charge Controller seems to have given up the ghost and no charge has been passing through it for quite some time, and consequently the batteries there are somewhat empty. But it was a shame to miss out on all of this lovely solar energy that we were having and so I made up a cable with a crocodile clip at each end and for a couple of hours I by-passed the charge controller by using this cable, and that put a little life into the batteries and we actually had some light in the barn this evening.

I’ll have to remember to do that more often, in order to give the batteries a chance to build themselves back up again. But that’s the second Charge Controller that’s failed in there. Something isn’t quite right, I reckon. I’ll need to check and see what it is.

-6

Wednesday 26th September 2012 – IT WAS ANOTHER …

… day today where I heard the alarm go off properly but the accompanying cloudburst made me turn back over and … errr … wait for a while before arising.

So after the usual while on the computer I went outside and started work.

And in another major change to my usual lifestyle, I was still out there at 20:00.

First plan was to fit the new handles that I had bought the other day to the gardening tools that were lying around. The rake and the binette worked fine but this sledgehammer handle won’t work at all.

But anyway, using the newly-repaired tools, I hacked my way through a huge pile of undergrowth, ripped up piles of nettle and bramble roots, and laid a big tarpaulin on the floor.

Onto this tarpaulin I collected up all of the scaffolding that I’ve been using and laid it out on there. That was followed by all of the leftover plastic slates, and then I cleaned out all of the wood and the breeze blocks from where I had been working.

That gave me some more room to move around there and I could then hack out another pile of brambles.

There’s probably only about 30m² of land to clear back there and I reckoned that it wouldn’t take long, but I’m being rather optimistic about that. It’s going to take a while.

But it needs to be done because the next phase is to clear all of the stuff from where I park Caliburn and it’s there that I want to put it.

That took me up to about 19:00 and there was still a little job that I needed to do. The charge controller for one of the banks in the barn packed up ages ago and so I’ve been wiring the panels directly to the solar bank – not that there’s enough energy produced over there to worry the batteries too much.

But I need to measure the energy that’s going in, and so I disconnected the remote ammeter off the other bank and wired that to it.

Not so easy as it’s pretty cramped in there so I hope that it’ll work okay.

Still, we’ll find out tomorrow, won’t we?

-2

Monday 16th July 2012 – BLIMMIN’ ‘ECK!

Yes, and for many reasons too. Probably the most important was that it didn’t rain today and we had bright blue skies, with just a few clouds passing by – the first time since I can’t remember when.

It didn’t take long for the batteries to be fully-charged, and then the excess solar charge was diverted into the dump load.

home made 12 volt immersion heater solar energy dump load overcharge les guis virlet puy de dome franceAnd with the data panel that I installed on the overcharge controller, I could see how it was doing.

28 amps – or 382 watts – currently going into the home-made 12 volt immersion heater. Already, 23.4 amp-hours have gone in and by the time that I took the statistics before going to bed, we’d have a grand total of 122.2 surplus amp-hours – over 1.5KwH.

By the time I was starting to slow down – at 18:00 – the water in the dump load was up to 58°C and still rising. And so cue a load of washing. That’s all hanging out on the line now.

I even changed the bed linen, having to peel the pillow cases off the pillows and the quilt cover off the quilt.

It won’t only be clean bedding tonight – it will be a clean me too, for the temperature in the solar shower reached 33°C and a couple of litres out of the 12-volt immersion heater pushed that up to a respectable temperature and so I had a nice warm shower – and how I enjoyed that!

Pure bliss!

That’s made me feel like a new man – although where I might find one around here is anyone’s guess.

But that’s not all.

The benefits of going to bed early saw me up and about and breakfasting at 07:40 and that was really astonishing. That meant that I had a good 4 hours on the website and I was still all done by midday.

So I mixed a load of mortar and made a start on rebuilding the stone wall on the lean-to. That kept me busy for a few hours.

Rob came round to borrow my 100mm hole-cutter so we had a chat for 15 minutes, and then I had another task to attend to.

Hardly any water seems to be entering the water butts so I also stripped down the home-made water filters. And as I suspected, bunged up to the eyeballs, they were. and cleaned out the water filters. No wonder there wasn’t much water reaching the water butts.

Anyway, they are all ready for the next torrential rainstorm.

And me? I’m ready to snuggle up into my nice clean bed. I’ve been looking forward to this for ages

-8

Thursday 12th July 2012 – I’M OFF …

… to bed in a minute – at a ridiculously-early (well, for me, anyway) time too.

And for two good reasons too.

  1. I have to be up early as you know. Terry and I are off to Montlucon to see what we can find in Brico Depot
  2. I’m thoroughly exhausted and I’ve already crashed out once this evening.

Just for a change I was up and about before the alarms went off and while I was having a leisurely breakfast Rosemary rang up. “It looks as if it might be a comfortable morning so I’ll come round now if you like”.

Well, I need all the help I can get in the garden and one volunteer is better than 10 pressed men so I had to steam-clean the kitchen, tidy up in here, empty the composting toilet, all that kind of thing, at a rapid rate of knots.

And then a car pulled up. It was not Rosemary but Bill who had come for a chat. His van has just failed its Controle Technique, but not with anything serious and so we needed to devise a cunning plan to fix it.

Just then Rosemary appeared and so Bill wandered off while Rosemary and I attacked the garden.

Stopping for lunch for an hour or so was the only break that we had, but by the end of the day several of the beds are all weeded out, some (but by no means all) of the leeks are replanted, and then we attacked some of the jungle that was in the way.

After Rosemary went home, I carried on for an hour or so and that was my lot I’m afraid. I was finished off. Nevertheless, substantial progress was made today in the garden.

I’ve also made a smart discovery too.

I’m using a Xantrex C60 charge controller wired in backwards to act as a dump load controller. Normally, a charge controller senses the voltage levels in the batteries. When the solar panels and wind turbines have fully charged the batteries, the charge controller then cuts off the charge.

With certain charge controllers, you can fiddle about with them so that instead of switching off, they switch on. And then instead of having them wired as
INPUT ENERGY —> CHARGE CONTROLLERS —> BATTERIES
you can wire them
INPUT ENERGY —> BATTERIES —> CHARGE CONTROLLER —> DUMP LOAD (although I still keep my input charge controllers as a safety measure.

My dump load is a home-made 12-volt immersion heater – a huge 500-watt heater element suspended in 25 litres of water, and this is how I heat my water in summer.

The Xantrex controllers have a facility to have a data panel wired in so that you can see the amount of current passing through and I just happen to have a spare data panel that I dismantled from the charge controller that stopped working the other week.

I wasn’t sure if it would work on the one that I’m using as a dump load controller, what with it being wired in backwards and so on, but I gave it a go and in fact it does, which is really exciting news.

I’ve had 22.2 amp-hour worth of excess charge heating my water today. That’s quite impressive considering that the weather has been cloudy for all of the day. I wonder what it will show in a bright sunny glorious day.

But we aren’t ever going to have one of those ever again.  

-2

Tuesday 5th June 2012 – I’VE MADE FURTHER STRIDES …

… in the garden today.

after another late start and breakfast I carried on with my notes from my recent trip to Canada and the USA and they are now all up-to-date.

Following that I had a huge pile of stuff to pack and prepare for shipping – and it was then that I realised that the UK is closed today.

Bearing in mind the catalogue of disasters that occurred while I was away, after lunch I started the repair programme.

A few batteries needed recharging and replacing and it didn’t take long to do all of that

new fuse 12 volt immersion heater les guis virlet puy de dome franceThe new fuse is now fitted to the overcharge circuit that powers the home-made 12-volt electric immersion heater and so I have hot water again at last.

But the largest strip fuse that I have seems to be 50-amp and that’s nothing like enough, but it’s all that I have for now. It will have to do.

I’ll have to pay a discreet visit to the local car breaker’s, or else buy some … “Buy? Are you feeling alright?” – ed … when i’m next in the UK. The type that I want actually range from 40 amps to 250 amps so I shouldn’t have too many problems getting what I want.

Not so good news in the barn though. As you fix one problem, another problem rears its ugly head. It seems that one of the charge controllers, the oldest one, has ceased to function.

10 years old so I can’t complain too much but it is rather annoying.

It’s something internal that has gone wrong with it. I can tell this because the voltmeter is registering the voltage on the battery so that side is fine, and the hourmeter wired to the input side is working too, so that bit is okay. it’s all of the bits in the middle where we have a problem.

What I’ve done for now is to connect the two terminals together with an old jump lead – not ideal but at least current is reaching the batteries and so they will charge up.

But there’s no cut-off when they are fully-charged so I will just have to keep my eye on them, and disconnect them if I have to go out on a sunny day.

That left me an hour in the garden and I weeded one of the beds. It’s stil not all done but at least I can see what’s in there. Tons of brussels sprouts by the looks of things.

>Meanwhile in other news, since I graduated from University, the whys and wherefores of OUSA – the Open University Students Association, have been sadly lacking from these pages.

I’ve been doing my best to put it all behind me but it won’t go away.

The latest is that what should have been a private mail from an elected officer to a member of the Association but which was “inadvertantly” (as if that ever happens) published to a public forum.

The memo reads – Hi all. My name is Hazel (http://www.facebook.com/hazel.pegg) and my Alter Ego is VP Comms. For various reasons my official ID needs to be an admin of your FB page. please don’t force me to go the heavy route?

What kind of threat is that to make to a member of an organisation of which the writer is an elected member?

My own opinion is that it is thoroughly shameful. It reminds me of the Kray Twins or the legendary “Dinsdale” sketch – “he nailed my head to a coffee table. He didn’t want to do it – I had to insist”.

But whatever you might think – it just goes to show that nothing has changed in OUSA.

-1

Friday 16th March 2012 – I HAVE HARDLY …

… been outside today.

I’ve been a busy boy inside – piles of paperwork that all needs completing by Tuesday and so there’s no time like the present to do it even though I’m not really in the mood.

Apart from that, I had to change the batteries over in the outside temperature gauge and that meant moving the dustbins with the sawdust and the kindling. And while I was doing that I cause a huge pile of wood to fall over that was propped up there and so all of that had to be repositioned.

Such is the exciting life that I lead.

But in other news, the dump load was registering off the end of the temperature gauge as early as 14:00 and there was that much power going through the dump load controller that the heat sink was positively boiling – and I had a few papers and a plastic fuse holder sitting on top.

I’m surprised that the whole thing didn’t go up like Joan of Arc like the brazier did yesterday.

This dump load is clearly to small for summertime use – it needs more than 25 litres of water. But if I do that, then there will be not enough useful heat in the winter.

What I need is two tanks therefore, each with its own water heater element.

But the overload controller only handles 60 amps, and each water heater element is rated at 500 watts, which (at 13 volts) is about 40 amps or so, and so it won’t handle two elements. And anyway, imagine how hot the heat sink would be.

The clue for this might well be twofold, and as I don’t know the implications of what I’m talking about, I’ll write it here and invite comments.

Basically, I could have two elements and have them both wired to the battery circuit, but have them wired via relays that are powered from the overload controller. After all, the relays that would drive the heater elements need just enough power to overcome the resistance of the spring, namely a few milli-amps or so. That way the heat sink wouldn’t be so hot.

But a refinement of this is to have the second relay wired to a heat switch that is attached to the side of the water tank that is heated by element number one.

If the switch were set to close at, say 65°C, then when the water in the tank is heated to that temperature and the heat switch detected it, it would switch on the second relay to heat the element in tank 2.

What would happen then though would be that the current would be split 50/50 between the two elements, so that would mean that the temperature in tank 1 would continue to rise as the temperature in tank 2 was continuing to warm up.

So supposing I had another heat switch on the side of tank 1 – this time a switch that opened at say 70°C and wired to the element in this tank. When the water in tank 1 reached 70°C the switch would open and this would cut off the supply to the element in tank 1 and stop the temperature rising.

Without heat the temperature in tank 1 would slowly fall and when it fell to 65°C it would cut the supply to tank 2 and restart the heat at tank 1.

This all sounds thoroughly complicated to me, but that’s the way that it would have to work. I just wish I knew enough to work out what the pitfalls would be in all of this.    

Tomorrow I’m going to be heading to Montlucon if I’m up early. I need a bulk shopping session seeing as how I haven’t been there since January, and I need a pile of stuff from Brico Depot.

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Friday 19th August 2011 – What I would be doing this evening …

… is to post a photo of where I finished on Thursday with the pointing, and I did go out this morning to take a photo. However, despite a thorough search, I can’t remember where I put the camera afterwards. It’s defnitely getting to me, all of this.

So after working on the web site this morning I went out and did some more searching for stuff that I need for Canada. And I’m badgered if I can find my box of battery terminals. I’ve about 50 somewhere but your guess is as good as mine.

What I’m intending to do is to buy a caravan battery over there, but to have two terminals with me, with a solar charge controller, a multi-cigarette-lighter socket, a couple of 12-volt sockets and a 12/120 volt inverter wired up to it so that all I need to do is to slip them onto the battery and wire the solar panel to the charge controller. Then I’ll be all set up for my voyage. But where are these blasted terminals?

This afternoon, down to the bank to transfer some money, warn them about my visit to Canada (I don’t want to have another cash card swallowed up by “unusual spending patterns”) and to obtain a certificate of no claims for my insurance over there in case I decide to buy a car. I also went to the Mairie at Pionsat to get some info for the radio programmes.

I still had time afterwards to go up the wall, and I’ve extended the ladder almost right up the the apex – that’s about 9 metres and of course I’m 2 or so metres off the ground before I start, being on the roof of the lean-to. It’s decidedly shaky and being up there with no hands on the ladder while I chisel out the decaying mortar between the stones – I’m just not looking down.

The good side of today though was that the solar water reached 40.5°C and I had a gorgeous shower. What a way to start the weekend? I might even to to the swimming baths tomorrow.

For a little entertainment this evening, I watched the John Wayne film She Wore a Yellow Ribbon. It’s said to be one of his classics but it’s not a patch on El Dorado or Rio Bravo, his two best films by a country mile if you ask me.

What is interesting though is that She Wore a Yellow Ribbon is set in Monument Valley in the Utah-Arizona desert and it brought back all kinds of happy memories as keen long-term followers of this rubbish will recall that I visited there in 2002 when I was first off work ill, and I’ve never ever forgotten that journey. Yes, this evening I saw all kinds of sights that I had seen in the flesh, as it were. I’m definitely getting to be all broody about North America, aren’t I?

What is even more interesting is that they had the Cavalry marching out of the camp to the tune of “Garry Owen”, but that was in 1950 and they wouldn’t ever dare do that now. “Garry Owen” was the marching song of the 7th Cavalry, the late and unlamented General Custer’s regiment and ought to really have died with him at Little Big Horn because it played rather a sinister role in the American Ethnic Cleansing of Native Americans.

Back in 1869, Custer and his cavalry were on the trail of a small band of marauding Cheyenne raiders but losing the way in a blizzard they stumbled upon the camp of Black Kettle, a peaceful Cheyenne chief whose camp on the Washita River, well within the confines of the concentr … errr … Reservation. Setting his band up on a bluff overlooking the camp, Custer had them play “Garry Owen” while he and his soldiers raided the village, massacring every man, woman and child they could find, inculding a white woman and child who Black Kettle had liberated from a raiding party a short while earlier.

The atrocities that were committed on the dead and dying by the 7th Cavalry, described in all their gory – “that’s not a spelling mistake” …ed – by Custer in his book My Life on the Plains and also by many other soldiers at the battle and they make horrific reading.

Of course, this film was made 20 years before the release of Soldier Blue – the first film to blow the lid off the myth of the “heroic” US Cavalry and reveal them as the butchers and sadists that they really were. Soldier Blue concerned the earlier dreadful and notorious massacre of peaceful and innocent native Americans at Sand Creek – the event that brought home to the native Americans that whether they surrendered or whether they resisted, they were still going to be massacred (as indeed they were) and so they stood and fought.

Such was the horror of what happened at Sand Creek that an American Investigating Committee said of Colonel Chivington and his soldiers that
“(we) can hardly find fitting terms to describe his conduct. Wearing the uniform of the United States, which should be the emblem of justice and humanity; holding the important position of commander of a military district, and therefore having the honor of the government to that extent in his keeping, he deliberately planned and executed a foul and dastardly massacre which would have disgraced the verist savage among those who were the victims of his cruelty. Having full knowledge of their friendly character, having himself been instrumental to some extent in placing them in their position of fancied security, he took advantage of their in-apprehension and defenceless condition to gratify the worst passions that ever cursed the heart of man. Whatever influence this may have had upon Colonel Chivington, the truth is that he surprised and murdered, in cold blood, the unsuspecting men, women, and children on Sand creek, who had every reason to believe they were under the protection of the United States authorities”.

Of course, by the time that the Washita came around, some 5 years later, nothing at all of any criticism was levelled. “Manifest Destiny” was now official Government Policy and extermination of the native Americans was all part of the plan.

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Friday 8th July 2011 – Well I finished the wiring today

And that’s hardly surprising given the time that I had to do it, as when the alarm went off at 08:00 I was already up and about. How about that for a change of habits?

And so by 12:00 I was fed and watered, done a couple of hours on the computer and been in discussion with an American company about some stock and a dealership, I was outside.

The wires that come from the wind turbine and anemometer, and those which go to the solar panels – they are all sheathed now properly (and I seem to have got the hang of doing that now? and go where they are supposed to – down to where the new battery box will be.

And that wasn’t without difficulty either. I managed to finish off the hole in the floor that I started yesterday but as luck would have it, it’s right over the beam. So another hour or so to drill a couple of new ones and saw out between them to give me enough room to feed the conduit through. The charge controller is in place and the wind turbine is wired up to it. Let’s see what that does.

This afternoon I was working on the length of wire to connect the solar panel array to the batteries in the barn – the part of the wiring that is outside. That’s all nicely sheathed now and going where it’s supposed to. And after that, I was fitting the junction box onto the solar panel mounting rails.

That’s as far as I got, seeing as it was by then 19:00 and so a solar shower and that’s me finished for the weekend. Monday will see me finish off the junction box and cut the lengths of pipe that will stand the lower solar panel mounting rail off the wall at the correct 70°C angle. And then maybe I can start to fit the solar panels.

I’m glad that the anemometer is all mounted and that the wiring is properly installed. All I need to do now is to find the data head and I will be in business. But finding anything in my little attic room is an impossible task. Neitzsche said “Out of chaos comes order” but he had clearly never ever set foot in my attic.

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