Minimum SOC

My battery stops discharging at 5% SOC. Is by design to protect the battery, or can it be changed?

Mines 4% - but 5% is ok - might have been nudged higher or its a rounding error.

And yes its to protect the battery - they don't like being fully discharged (Or charged for that matter) - best kept between 20 and 80% - the current 8.2kWh batteries are actually about 10kWh but regulated back to be 100% @ 8.2kWh.
If mine isn't charged, then it gradually declines to 0% when it automatically charges back up to 4 or 5%. (Which is actually nearer 25%!)

anglefire Do you know what the equivalent numbers are for the 5.2kWh battery? I’ve only had mine a week. It seems to take 4.8kWh to charge it up overnight, but I’m not sure if that’s the amount stored in the battery, or the amount drawn from the grid, which I would expect to be larger.

I don’t off hand. I think the current 5.2 are quoted as 100%soc. so will be 6.3kWh batteries (or thereabouts)
So to recharge from 25% (1.6kWh roughly) to 5.2kWh is 3.6kWh - so your 4.8 seems a bit high. Even if the 25% is based on the 5.2kWh capacity it seems a bit high.
I would expect losses to be a couple of percent in conversion from ac to dc.

Battery capacity is fully explained in the k
Knowledge Base under Installation Guides - not sure how to do a hot link
https://kb.givenergy.cloud/article.php?id=10&oid=1

That’s true for the older spec batteries but not the newer ones. Or at least not the upper end. Bottom end will be similar.
Which would make more sense if the 4% equates to 15% as that would mean a charge of 4.8kw takes the battery from about 0.8kWh to 5.6kWh so a 0.4 kWh loss. Which is about 8% - still seems a lot. But that could be rounding errors etc.

The 8.2 is the only "100%" DOD one (unless GE datasheets are out of date)
The 5.2 and 2.6 are 90% DOD so 4.8kWh sounds roughly right for the AC side given its really 4.68kWh usable.

I’ve found the settings now, showing 4% is as low as it will go. However tonight it stopped discharging at 9%. Any ideas why that would be?

ChrisRowe Sounds like the battery calibration has drifted a bit. Happens all the time and is very annoying.

hoggy must admit I thought that the 5.2 was also 100 dod. But happy to be corrected.

hoggy 5.2 is an 80% dod.

https://www.givenergy.co.uk/products#givbat52

anglefire 90% dod.

A displayed discharged battery at 4% is actually around 15% real life discharged.
A displayed fully charged battery at 100% is actually about 95% real life charged.

A few % here and there, plus some batteries are bigger than their actual capacity ( 5.2 is about 5.6 / 8.2 is about 10.2 )

So very very roughly batteries are 80% dod of capacity.

Some are labelled as their actual capacity and other as their dod.

I think they are all going to 100% dod like the 8.2 to cause less confusion with the general public especially when they first start looking into the technology.

hmmmn. my 5.2 is 76% dod. my original 8.2 was 82% dod. Newest 8.2 is 108% dod. L:ooks like more capacity being added to individual batteries as time goes on?

judgepd Can anything be done about it? I’ve only had the battery for a week so I’m still learning!

ChrisRowe It's a known issue - I understand there should be a firmware fix at some point.

ChrisRowe This is a bug. Mine is set to 4% but stops at 8% now 9%. I raised a ticket and GivEnergy replied that they were working on it before Xmas.