Can I rely on the SOC%

Now that I can make sense of the downloaded data I can see an inconsistency in the battery charge data, which perhaps one of the experts on this forum can explain. The following chart shows the period 23.30-05.30 as this is when I have set up a scheduled battery charge.

The charge takes place as scheduled, starting from 4% and reaching 100% within 2 hours, although the max. charge rate for my Hybrid 3.6 inverter is 2.6Kw. I was expecting it to take over 3 hours to charge the 8.2Kw battery. The data shows a power level of 1474 during the charge.

I then looked at the Grid to battery data and compared it to the apparent increase in battery SOC and what a difference. The grid import was much lower than the 96% increase in SOC. So I'm left wondering what's going on.

Is the SOC % just plain unreliable or is there a problem with the battery?

in GE kit the SoC is very unreliable - just search this forum and you will see this issue going back years. They were multiple attempts by GE to address this issue by pushing firmware updates. I am currently on version 3013 and that seems to work the best for me. On any other version I experience between 20-60% weekly SoC drops.
I my opinion this is due to complete lack of quality control on GE manufacturing.

philipdawsonladds The main problem with reported SOC is when it's between, say, 20% and 80% - the voltage is very flat, and it's impossible to infer SoC from voltage over that range. Especially when the battery is in use.

But the more serious issue is that your battery is only taking in about 2kWh for a full charge. This might be a problem with the cells, or it might just be that it was too trusting of the SOC, and it stopped discharging when it reported 4%, but it was actually still almost full.

Do you also have the battery voltage available ?

If you're on Android, https://givenergymonitor.wixsite.com/tutorials might be helpful - that can report the individual cell voltages.

See also https://community.givenergy.cloud/d/1931-sudden-battery-discharge/13 which references a chart of typical cell voltages.

I got a very helpful reply from Support which confirmed your observation that somehow the battery capacity was set at 2.4Kw instead of 8.2Kw. Lewis (Support) has initiated a re-calibration but why did it happen and how can I monitor in future? Lewis tells me that regular timed charges or discharges can degrade the battery faster than normal - makes me wonder why this is an option in this case. Has anyone else using timed charges had this issue?

Any ideas where/how I can initiate a calibration myself and how to monitor actual battery capacity?

philipdawsonladds so you won't be able to initiate a calibration yourself, that's only with support at the moment.
As for checking what size battery you're supposed to have go to the web portal, My Inverter and there it should tell you the battery capacity.
To check the actual capacity, you'll need to monitor the charge to the battery against the SOC and calculate from there if it's correct.

philipdawsonladds how to monitor actual battery capacity?

if you go to the inverter part of the portal, and select data (the grid icon) then look in the 'meter data' tab, two of the columns on the right are 'batt charge today' and 'batt discharge today'. (There's also a 'Batt Throughput total' but that seems to record the average of the charge and discharge, and so isn't all that helpful.)

Because the data is ordered backwards by time, the topmost reading is the total for the day. I've never really studied this data, but for me it's between 6.5 and 8 in and out each day - depends on how much solar there is, I guess. (I charge from 10% low around midnight to 80% during cheap rate, then export back down to 10% through the day. Plus whatever solar comes in.)

You could use the API to download the daily data to record it over time - I think the portal only offers intra-day charts ?