if we want to install 20w solar pannel to my home then what should be the ah rating for 12 v battery?
Without bogging you down in calculations, if you have a lead-acid battery, the largest you should get is about 20 Amp-hour capacity, maybe 40 Amp-hour at the limit. If your battery is too large, it won’t charge right.
Also, not to discourage you, but the energy you get from this kind of system is on the order of what would run a low-power laptop for about an hour, or a performance laptop for a fraction of that.
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