Battery not charging fully

[P.Shutak]

Hi, Over past 3 weeks the battery is not charging up fully between 2-5am which is the cheap rate. The percentage drop has been progressive, decreasing every day reaching on 1.9Kw this morning. The battery is a 9.5Kw GivEnergy and was charging up fully until about 3 weeks ago. Why is this happening. I’m on the Octopus flux rate. Any advice would be appreciated.

[armstrn2]

Check this thread…

Battery charging rate

I have had the same problem with charge rate. I have a 3kW inverter but only got a battery charge between 2.65kW and 2.9kW. GE said it was within limit for losses but this in statement is misleading. If you look at the graphs there is an addtional inverter power tab. When the battery is charging at 2.9kW the inverter power does show 3.0kW showing a loss of 4% so within the spec. Even when charging at 2.65Kw the inveter power is 2.75kW so again show a 4% loss. This has hppened througout July-Oct …

I suspect your batteries are cold

[P.Shutak]

Thanks. Today it was charging at 400w, so your inverter is doing better than mine. Effectively this means i can’t make much use of Octopus’s flux rate in cold weather.

[armstrn2]

Just as a test… why not do a force charge to 100% to get some heat into the battries ?

Start it at about 7pm at night to try and keep it cheap - but let it get to 100% and then do a discharge.

I use “Predbat” and that gives me the option to do a Forced SOC - it’s worth giving it a try.

or - I keep my batteries warm using heaters… : Battery SOC calibration cold temperatures - GivEnergy Products / GivEnergy Batteries - GivEnergy Community Forum

[P.Shutak]

Thanks. I’ll try that and improvise with some insulation around the battery.