this post was submitted on 15 Jul 2025
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If I were doing this all again I'd use Victron inverter kit with the self build batteries (Fogstar do a decent kit), for an entirely self hosted control system, and whatever panels fit the roof space best. But 180W is nothing to worry about. More important to find a second area for another array.
Oh, and you will want a hell of a lot more than 5kWh worth of battery storage. I have 14kWh and run low in winter when the panels make naff all (charge on cheap rate power to last all day)
Are batteries ok in the roof? I thought the temperature variation up there would be too much for them?
(Lazy question without searching for the answer myself)
Current guidance does not allow installation in a roof space, and limits capacity to 40kWh in most houses (80 kWh in detached or separate garage). Guidance, not law iirc.
But they are so heavy I would not place them on ceiling joists, I'd want them on a concrete floor