LIFEPO4 Battery discussion thread

denmendez65 said:
Looks like the offer a 6 month warranty. After that you are at the mercy of the manufacturer. Its 50/50 it looks like. My Omnivolt from builders has a 6 month warranty from builders ONLY if i used an installer.

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Look I understand why they want COC etc because mistakes happen and people take chances but also feels like they use that as an escape plan not to honor a warranty which would leave them out of pocket.

denmendez65 said:
That's why I said the 30k part about the inverter. If paying that much I would consider it. Battery, not possible. I would be doing DIY LFP. The local guys actually offer warranties on the cells. So, if one packs up i just get it replaced.

You won't find me buying a Freedom Won battery. Even if I was a millionaire or something in dollars. DIY batteries, Cheap inverters for 15k under. That's how I roll šŸ¤£. More fun anyway.

My price playground is here lol.

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Those Ecco inverters do look pretty decent. Saw the on display at solarwarehouse.

DTBA said:
I just buy the cheapest battery for around 8-9k call it day. If the bms kaks Ill slap a jk in

To much BS rules

I will do it safe.
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Yeah I agree. I do like myself a budget build. These super expensive sunsynks might be nice but hands on with lfp is also quite fun and interesting.
 
denmendez65 said:
That's why I said the 30k part about the inverter. If paying that much I would consider it. Battery, not possible. I would be doing DIY LFP. The local guys actually offer warranties on the cells. So, if one packs up i just get it replaced.

You won't find me buying a Freedom Won battery. Even if I was a millionaire or something in dollars. DIY batteries, Cheap inverters for 15k under. That's how I roll šŸ¤£. More fun anyway.

My price playground is here lol.

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How will you CoC DIY battery for insurance?
 
cavedog said:
The state of health at 100% is just the BMS. How much capacity do the cells still have after 3+ years. That is the real question. It probably lost like 4% or so.
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New cells always deliver more capacity than advertised so BMS just doesn't report anything over 100% I would assume and/or has probably never ran them dead so it hasnt had the opportunity to do the calculation.
 
wingnut771 said:
As long as your insurance company is happy lol.
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Well they cant say anything really. All the protection etc is there. The electrician will check according to the SANS requirements. You just ring him up, tell him what you want to do, ask him if he has any objections and voila.

There are hundreds of homes running DIY banks in SA, thousands upon thousands worldwide. There wouldnt be a market for them if all these homes lost their insurance.
 
denmendez65 said:
Well they cant say anything really. All the protection etc is there. The electrician will check according to the SANS requirements. You just ring him up, tell him what you want to do, ask him if he has any objections and voila.

There are hundreds of homes running DIY banks in SA, thousands upon thousands worldwide. There wouldnt be a market for them if all these homes lost their insurance.
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Dont CoC need serial numbers and whatnot?
 
wingnut771 said:
Dont CoC need serial numbers and whatnot?
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They can use the JK serial number. Not all batteries come with from what I saw on this forum. I think @DTBA said his doesnt have.

Screenshot 2026-06-02 211710.pngScreenshot 2026-06-02 211639.png

Would definitely build mine with these. It will suffice with 80% of the installers I am sure.
 
denmendez65 said:
Unfortunately says enquire. But local options exist. With enough digging one can find something. From Lithium battery SA and comes with BMS and breaker.

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Who wants puny 5kWh for DIY kit? IMHO, all these cases are rip offs and defeats the DIY option being cheaper.
off-grid-garage.com

Battery DIY-Kits

On this page, you will find some battery DIY-Kits, I have tested on the channel. These are mainly pre-configured battery cases with all accessories included. Itā€™s a battery construction set wā€¦
off-grid-garage.com off-grid-garage.com
 
@cavedog, this one's for you, sorry about the rabbit hole, but I found a use for your cheapig, charge your big battery:
 

I will set the voltage cut off at 3.1V a cell or 49.6V. Maybe 49 to cover for voltage drop. He has some good info @wingnut771.
 
denmendez65 said:

I will set the voltage cut off at 3.1V a cell or 49.6V. Maybe 49 to cover for voltage drop. He has some good info @wingnut771.
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That is under a 20amp load. If you have something like 3amp load it might cutoff too soon if you want to use the last bit of capacity. I think that is what I experienced with my 1 x 5.12kw battery. On a small load like 100w through the night at 50v cutoff/switch to grid there was still around 20% give or take left.

Now since I have more batteries I have more aggressive discharge voltages.

Screenshot 2026-06-03 100838.png
 
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