Solar pv and other domestic micro-generation technologies

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cathrobinson
cathrobinson
1 Oct
7:35pm, 1 Oct 2024
12,965 posts
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cathrobinson
Snail wrote:Is that because your battery is in a cold location @cathrobinson ?


It’s in the loft…

Jef wrote:What size battery do you have @cathrobinson ? We have a 13.5 kw and can charge it from flat to 100% between 2am and 5am on octopus cheapest rate.


8.6kWh. We should be able to charge it fully, but when it is cold (and we’re talking over 10 degrees still), it charges at a very slow rate.
HappyG(rrr)
HappyG(rrr)
2 Oct
7:25am, 2 Oct 2024
51,044 posts
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HappyG(rrr)
Jeff, you must have a faster inverter than us? What power rating @Jef

We can only charge 7.5kWh in 3 hours (inverter max power is 2.5kW) so we can't fully charge our 9.5kWh battery. Nothing to do with the cold though! And our battery is outside house. In Scotland!

I was annoyed to discover this after running as I don't feel this was explained to me by installer.

Cath @cathrobinson is it def quicker when warm? Are you sure it's not just a low power inverter? :-) G
cathrobinson
cathrobinson
2 Oct
8:03am, 2 Oct 2024
12,966 posts
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cathrobinson
It fully charges within 2hrs when it is warm enough, so it’s not the inverter. We also have the same issue on sunny days in winter - the battery barely charges and we end up feeding the grid, which would not be my preference.
HappyG(rrr)
HappyG(rrr)
2 Oct
8:59am, 2 Oct 2024
51,045 posts
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HappyG(rrr)
That seems wrong cath - very poor. Worth logging with them as a fault, because it seems like very poor battery performance? Good luck. :-) G
Jef
Jef
4 Oct
2:29am, 4 Oct 2024
16,399 posts
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Jef
Re inverter, @HappyG(rrr) I’ll check when I get in.

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Maintained by ThorntonRunner
Every so often we talk about solar pv, batteries etc split across the environment, energy bills and electric car threads. Here's a dedicated home for such discussion :)

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