100% SoC from nowhere

I have an AC3 inverter and 9.5kWh battery, installed in late December. In the last few days the battery has been running on 1 to 5% SoC as I would expect as there is precious little solar and I do not charge from the grid. Eco mode is on.

This evening I noticed three green lights on the battery cover where previously it has had one flashing light. So I looked at the app and my battery was reporting 65% SoC. So where did that come from? Tracing back through the data it seems that the battery SoC changed from 0% to 100% between 15:57 and 16:07 this afternoon, but there was no energy flow from anywhere else. Even if the power had come from somewhere else, getting 9.5kWh into the battery in 10 minutes isn't likely. Although the cloud figures are normally updated every five minutes there is no data for 16:02.

In the period since 16:07 the battery has been gradually discharging into the house load and is now at 62%.

Do you think that my battery might find 9.5kWh from nowhere every day because I would be really pleased if it would.

The battery fairy will only visit about every 3 weeks.

Does anyone know how I can find out whether any remote changes to firmware or settings were made to my system at about 16:00 on the 10th January 2023?

666tim666 Call or web chat Givenergy during office hours.

666tim666 My system did something similar to your system (same setup) on Monday 9th but at 0430. The battery charged from 2% to 100% in 5 minutes. The battery powered the home for the rest of the day and was topped up by a small amount of sunshine.

If the SoC data was not correct then where did the 9.5kW of battery power come from?

It could not have been charged from the grid and I was so sceptical that it took photos of the non-smart meter to check that power was not being drawn from the grid when the app said we were running on battery power. In 6 hours consumed a couple of kW.

666tim666

I have exactly the same problem although my AC3 and 9.5 was installed a little earlier (August last year). I've spent a great deal of time on the phone to GE and all they can say is they're aware there is an issue and a fix will be issued on 16th December via a firmware update (not sure which year 😄). Lots of systems see the problem. Read about it here:

[https://community.givenergy.cloud/d/713-firmware-3007-has-not-fixed-sudden-soc-drop-to-0-problem/1880](https://)

Today I saw it go from 11% SOC to 100%. All from an hour or two of patchy sun 😆

Tim Have spoken to GivEnergy support about this and the only reason they could give for the sudden addition of 9.5kWh to my battery was that the 'SoC fault' had caused the system to lie about the level of charge. They said that they had not made any alterations or updates to my system at 4pm yesterday when this behaviour occurred.

They said that they would update my battery firmware to 3007, the latest version. As the web portal says my firmware is currently 3008 this seems odd. Maybe be 3007 is better?

They said that they are working on the correction for the SoC fault. I think we knew that.

But where does all the extra power come from? I am also on v3008 with a system installed in August 2022

666tim666 my 9.5kWhr battery installed late Nov 2022 has firmware 3009. So far no issues.

666tim666 I suspect that the reversion to 3007 will fail but whether it does or not the issue you gave will only be fixed by the official fix release, much waited for

ChrisAS But where does all the extra power come from?

The power doesn’t appear or disappear. It’s the BMS (Battery Monitoring System) making mistakes about what the measured values mean. Sometimes it can be that the measured voltage is wrong or that the trend being tracked is flawed. Givenergy have acknowledged this and are developing a new algorithm that has been through a laborious testing programme with end users taking part. Fingers crossed for a positive outcome soon.

I've had the same thing today and also about a week ago, I've been communicating with GE about something else and they told me the same, that it's being worked on as part of the new firmware. Mine was installed mid last year and I haven't known it happen before, I have had a few times where it would get down to 30% overnight in summer and then just totally discharge (or it said that it did).