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Old 08-03-2021, 23:07   #1
makeitfit
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Default Going off grid :)

Probably one for Rick but here goes
It looks like I might have scored a grant to get solar panels and inverter.
This is for my REWORX shop. It's my upcycling, reclaimed and bespoke interiors project, more of that again.
4kw system
The idea is to try and store as much as possible in batteries and use that to run my lighting displays in the shop.
Pretty much all of them are LED
Anyway, it's 24v and I guess I'll need many 1000 s of amp hours
What do I look for ? Budget is max £1200
Thankyouplease
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Old 08-03-2021, 23:19   #2
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Is that budget for pv panels, batteries and inverter? bit on the low side, youwill not get much for that sort of money, but why the inverter if you are running nothing but lights? Rick
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Old 08-03-2021, 23:54   #3
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£1200 is the bit we have for the batteries
Just checked the spec
Briefly: 3kw inverter charger with built in mppt solar controller.
ac/dc isolators, consumer unit and ac input and outputs
12 x 320w solar panels
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Old 09-03-2021, 00:04   #4
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2v 775a/h GNB traction batteries 2016
12 off @ £625 plus vat plus delivery
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Old 09-03-2021, 00:17   #5
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I would need some reliability data for an all in one box inverter/charger(from the mains) and solar controller (also a charger) is the inverter pure sign wave, Rick
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3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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Old 09-03-2021, 00:18   #6
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The batteries are a bit dear for 5 year old, Rick
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Lokka on the front with manual hubs
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3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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Old 09-03-2021, 09:51   #7
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Lithium mate, Chinese ones are getting better and better. Remember you can discharge them more so don't just look at the amp hours. Think max you can discharge a lead acid is 50%? I think lithium is more like 70%?

Check this guys youtube out for some ideas - https://www.youtube.com/user/greasybrothers
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Old 09-03-2021, 10:59   #8
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i looked into the chinese batts and concluded it was not worth getting them inported as some already here were not much dearer.you can take them to almost o volts as the built in brains cut off power out completley,the good thing about them is they output full volts not a reducing volts and take a really hefty charge so get fully charged fast but you do need the correct charger for them.i wanted 2 for my caravan.
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Old 09-03-2021, 12:04   #9
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Ordinary lead acid 50%

Full traction 80% but almost every day for at least 15 years

Li far too expensive, plus they have built in regulators so will give no warning but just cut off when reached safe discharge level, big problem with these also is if one of the regulators fails and a cell discharges below 3v it will be permanently damaged and a fire risk, Rick
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Lokka on the front with manual hubs
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3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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Old 09-03-2021, 13:18   #10
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Depends on what Battery system you have, You can build your own and choose a decent Battery management system where you can tweak the settings and does different things at different points/voltages.

Probably a bit over budget for pete, But certainly not too expensive.
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Old 09-03-2021, 20:44   #11
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What batteries you looking at Fez as I cannot find anything that is not an arm and a leg with ridiculous specs? Rick
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Ex banger racer now off road maniac
Lokka on the front with manual hubs
Diff lock on rear
3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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Old 11-03-2021, 16:55   #12
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When I last looked it was about £80 per Lithium cell (3.3v 120ah). Might be cheaper or more expensive now (Depending on exchange rate, taxes, Import fees etc)

So would need minimum 8? For a 24v 3kwh system. £80x8= £640
For a decent system times by 4. 12kwh = £2560
Battery management system £150-200+
I only briefly looked into it, Was surprised on how much prices have gone down.

Now this might be way more than a traction battery setup, I wasn't aware they can be discharged so much.
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Old 11-03-2021, 19:41   #13
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Mmmm that set up would give me 480 Ah, currently running 800 plus Ah at a lot less money, 480 would not be enough for our current needs and I do not think from what I read about overall life that I would get the 6000 plus charge discharge cycles that I get with lead acid, thanks anyway Rick
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Ex banger racer now off road maniac
Lokka on the front with manual hubs
Diff lock on rear
3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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Old 14-03-2021, 12:48   #14
makeitfit
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Well I'm now the proud recipient if one resilience grant 🙂
Next problem is to actually find some batteries.
Procrastination over 🤪
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Old 14-03-2021, 21:16   #15
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Before you start looking for batteries you need to establish your amp hour requirement, this will be based on your average amp hour draw and the output maximum of your solar array, plus how long you require to be able to function on one charge cycle, hope this helps, Rick
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Ex banger racer now off road maniac
Lokka on the front with manual hubs
Diff lock on rear
3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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