off grid at Gloucester

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Re: off grid at Gloucester

Postby davidg » Sun Oct 28, 2018 10:26 am

Hastings wrote:Davidg you said only 60% dod for lithium. All the stats and real world reviews I have read, say 80 and even 100%. Is this not right?


Marketing is wonderful thing isn't it.

Australia is a hot climate and because of this the marketing info typically based around Europe is inaccurate. If you want the cells to last then they should only be charged to 90% max 95% and not discharged more than 70% DOD which effectively means a total of 60% DOD, deeper than that definitely and noticeably shortens a cells/pack life. To achieve this a BMS needs true intelligence and control or you have to VERY AWARE of what is going on in terms of charge and discharge states that means you need to be overseeing what is happening most of the time. Unlike most marketing the fact is that over 35C there is a serious impact on long term life of the cells so that needs to be avoided.

Managed battery packs such as LG and BYD offer have the intelligence to decide what the state is, what the amount of charge is, how far they will allow discharge, how much chare itwill allow and so on, based on all sorts of things including heat. These BMS's do control a considerable amount of things for the cells that's why the can offer a 10 year warranty, but they will run away at the speed of light if the packs warranty is not followed.
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Re: off grid at Gloucester

Postby jules » Sun Oct 28, 2018 10:32 am

Hastings, you should be able to stay within your 13Kwh per day and maybe improve on it when you're off grid. If you also have solar hot water and can use wood for some part of your heating, [or even cooking with a slow combustion stove], you'll reduce your power needs. I use a gas cook top, largely because I regard them as being the best way to cook but it's also true that they use very little gas. I get about 6 months out of a 9kg cylinder which is ok, even with the new improved price of gas we now have to bear. Good passive solar design of your house will help enormously of course :)

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Spares; 5 x 12V, 1,000 Ah batteries plus a couple of regulators
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Re: off grid at Gloucester

Postby Hastings » Sun Oct 28, 2018 11:52 am

Yes, I was aware of the operating temps and relation to battery life, just wasn't aware that people would tell lies...... :lol:
It all comes down to your own experiences and what makes sense at the end of the day. Well, I can tell you that nothing about solar makes sense to me, ATM.

So keep on giving up the answers please. I know one day Ii will click.
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Re: off grid at Gloucester

Postby Hastings » Sun Oct 28, 2018 11:53 am

Hey, Jules.
You might be interested in my post about the new build over on the alternative building thread.
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Re: off grid at Gloucester

Postby jaahn » Sun Oct 28, 2018 5:13 pm

Hi Hastings :)
If Solar is a mystery then I suggest a good book is a good start. Probably cheaper than the first mistake you make buying some item. :evil:
Solar Success. complete guide to home and property systems. By Collyn Rivers. I have it and another one by him too. It is written in Australia by an Australian who lived off the grid in WA.
You might even find one in your local library or a second hand one on line perhaps. Available new in lots of places and online.

Money well spent to read on those long nights when you want to understand something. Re read it as often as you need to, a bit here and a bit there. :geek:
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Re: off grid at Gloucester

Postby Hastings » Sun Oct 28, 2018 6:10 pm

Thank you Jaahn for reminding me about Collyn Rivers. I have his book on 12 v solar camper systems, but didn't know he produced one on homes.
I will purchase one immediately.
That will save some "oh no not him again" on this forum... ha ha
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Re: off grid at Gloucester

Postby Hastings » Sat Nov 03, 2018 1:40 pm

Anyone know what the cost of a 13kw/h stand alone system with lithium installed would be?. I know how long is a..........but surely there are some basic price structures out there
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Re: off grid at Gloucester

Postby Gordon-Loomberah » Sat Nov 03, 2018 2:11 pm

There are kits etc, some pre-wired, of various sizes on Gumtree and ebay, I suspect most will be Lead-acid batteries though, but I'm sure you can discuss battery options with vendors. Pricing is entirely dependent on brand, specifications etc, so no one could give you a general covers all price.
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Re: off grid at Gloucester

Postby jaahn » Sat Nov 03, 2018 2:20 pm

Hi Hastings,
If you go to the top of this forum and look at the band which says "limited time special offers' click here. Well click there and see what you can get. Probably a sales person. :) :) :)
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Re: off grid at Gloucester

Postby Gordon-Loomberah » Sat Nov 03, 2018 2:29 pm

I suspect a sales person who will tell you that EM don't do off-grid these days.
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