Kind of. Consider solar panels. A lot of the time, you'll be using around 30% of the discharge capacity to keep you overnight. However, some days will be cloudy

Kind of. Consider solar panels. A lot of the time, you'll be using around 30% of the discharge capacity to keep you overnight. However, some days will be cloudy, so you might have to use more of the capacity. In this situation, a Lead-Acid will have the full capacity that you bought, but will age like you're using 30% of the capacity most of the time.