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Even if it is stormy they charge it?

We have 8 for now. My father has plans to increase but my mother advices we shouldn't be fully dependent on them.

Well, to be honest I am not sure about the battery capacity... It has the size of a rectangle box

We have mains electricity too so we will be fine when the weather is really bad and the days are short. The panels and battery will pay for themselves over several years anyway. The economics may be different for you.

As I already said, these are the best things to invest in. No more of those expensive papers with huge amounts written on them. Thanks to the solar system