10kWh LifePO4 DIY Battery Addition..... Here is my write up.

Have you any link or details please

Allen He from Docan Powers sent me the quote in April. Contacted through Alibaba.

I purchased EVE cells from them before which they said would be closer to 290Ah than the advertised 280Ah and they were. So when he states these are close to 300Ah I would believe it.

I have purchased 32 EVE cells from them before, the VAT is already paid on them. They came straight through customs without any delay or additional charges.

But obviously anyone buying should confirm this first with any seller.

Well, €1745 for over 14kWh of true capacity is a bargain. Go ahead everyone and buy them and sell me your old CALBs 😁

I've never had that issue using Alibaba and DDP, not yet anyway.

AliExpress is definitely better set up for that side of things.

Further on this..

I cleaned all the battery terminals, and the upper and lower surface of all bus bars, and applied copper paste to the top of each battery terminal, the top and bottom of each bus bar, and the top and bottom of each ring terminal (both the ones for the BMS sense wires and the ones on the 16mm2 cables to the DC breaker),

Didn't solve the problem unfortunately, as soon as the Sofar tries to discharge, I get the same error as before. Reporting 0 or 0.2V on Cell1 &2 and the Seplos shuts down. I had real time recording running in the Seplos during this time, and it doesn't show any voltage drop on cell 1 or 2.

It seems the Cell1 and Cell2 seems to be a common feature, and it doesn't necessarily mean the problem is with those cells?

Any guidance, suggestions or advice welcome.

Not yet unfortunately. Wasn't getting any response from Seplos either, but today they replied and CCed the tech person, Alex I think.

So, I'll provide all the details to him and hopefully he can give me some guidance. It's a bit annoying to be exporting so much to the grid these fine days instead of storing locally.

I’m wondering if people have the Neey then what exactly is the need for the Seplos at all?

Would home assistant reading the voltages controlling the Sofar do similar?

And with no BMS, you'd also need to input some sort of parameters into the inverter, where the inverter then thinks you have Lead-Acid's connected, and will calculate the SOC% based on those parameters.

This is one area where the Sofar fails miserably

Very similar issue now, cell 1 to 204 and cell 2 to zero.

Would be great if they had a new firmware to sort this one out.

Not sure how, the fact that it works for hours fine and then just has a heart attack randomly.

Yup, always the first two. One of the lads swapped cells, connections etc and was still the first two. Head wrecking.