Huge loss of capacity after power cut / restart attempts.

Folks
I have a 'plant' of 2 X 8.2, each with its own AC3.0 inverter.
I also have an EPS, which utilises a manual changeover switch, to disconnect the grid, and allow me to run of the ESS.
It's been working [fairly] successfully for about 3 years.

During a recent power cut, the inverter 'round' lights (normally green ring) were red, and despite a lot of effort, I couldn't get either of them back on line. I assumed it was a system problem, and tried many times to shut everything down, and re-start - including the batteries and the inverters - but to no avail.

When the grid power was finally restored, everything started up correctly.
However... one of the batteries had 'forgotten' it's SoC of around 80% or so when the power cut occured, and has since 'lost' pretty much all of its capacity. It'll start at 100%, but if it discharges @ EG 1kW for just a few minutes, it's down at 6%; if I charge it back up at 3kW, it'll be back up at 100% within a few mins.

I've tried a very slow discharge, followed by a very slow charge, but to no avail.
I'm tempted to try a calibration, but am concerned that it could just make things [even] worse.

The other battery/inverter combo is working as normal.

I tried sending GE a report, and got a ticket number back, but then of course things went Pete Tong, so I assume there'll be no more help from that direction....

Any bright ideas, or has anyone had a similar issue.Folks
I have a 'plant' of 2 X 8.2, each with its own AC3.0 inverter.
I also have an EPS, which utilises a manual changeover switch, to disconnect the grid, and allow me to run of the ESS.
It's been working [fairly] successfully for about 3 years.

During a recent power cut, the inverter 'round' lights (normally green ring) were red, and despite a lot of effort, I couldn't get either of them back on line. I assumed it was a system problem, and tried many times to shut everything down, and re-start - including the batteries and the inverters - but to no avail.

When the grid power was finally restored, everything started up correctly.
However... one of the batteries had 'forgotten' it's SoC of around 80% or so when the power cut occured, and has since 'lost' pretty much all of its capacity. It'll start at 100%, but if it discharges @ EG 1kW for just a few minutes, it's down at 6%; if I charge it back up at 3kW, it'll be back up at 100% within a few mins.

I've tried a very slow discharge, followed by a very slow charge, but to no avail.
I'm tempted to try a calibration, but am concerned that it could just make things [even] worse.

The other battery/inverter combo is working as normal.

I tried sending GE a report, and got a ticket number back, but then of course things went Pete Tong, so I assume there'll be no more help from that direction....

Any bright ideas, or has anyone had a similar issue?

Sykes Any bright ideas

You could rip it out and replace with a single system of equivalent or better power.

For example, but not a recommendation you need to do your own research talk to suppliers, etc.
https://www.itstechnologies.uk/products/installed-solis-8-10kw-hybrid-plus-fogstar-energy-eco-16-1kwh?variant=57922472706429

Stick your old GE kit on ebay pronto (spares or repair?) and you should get half the cost back, and the savings you have made over the last three years should cover the difference.

I came across this,
https://solar-tech-support.co.uk/solar-not-working/
who might be able to help, while searching for possible support solutions after the recent news. I've not used them but wondered if having them on a retainer for £10 a month might be worth it long term or a one-off £75 remote diagnosis.
If you use them let us know if they were any good.

Mix There's dozens, if not hundreds of chancers putting up the same thing - "GE gone bust, we can help", which basically amounts to "we'll rip out the GE stuff and put in whatever makes us the most cash".

NOBODY REPUTABLE is going to go anywhere near a GE system they didn't install.

One option might be to pay TheDragon aka Paul and/or Mick

I believe they've offered help with getting stared with Home Assistant (for a small fee, given they've been made redundant and need to put food on the table).

I think they might also be looking at providing ad-hoc hardware support too.

I don't think I've ever spoken to Mick, but as for Paul, he is brilliant - as I'm sure many of us would agree - he's helped me commission a new inverter when my installer was getting stuck, plus I've been involved in lots of beta testing so various emails and forum messages back and forth re beta testing and some ad-hoc support when firmware updates didn't go quite right.

Keep an eye on the Facebook forums (givTCP ones I guess) for more info.