It depends on how many cloudy/winter days you want to be proof for right? There needs to be some backup capacity for when you won't be able to fully recharge fo

It depends on how many cloudy/winter days you want to be proof for right? There needs to be some backup capacity for when you won't be able to fully recharge for weeks on end. Although I suppose it is cheaper to oversize solar and not the battery, but that's usually already maxed out and limited by roof space. Maybe a small wind turbine to compensate for stormy days...