This is a small video in the Series on how to calculate power inverter run time. This video covers how batteries are rated and what information we need to calculate how long a battery can supply power. This video lays out why we look for Amp Hour (Ah) Rating instead of Cold Cranking Amps (CCA) when looking for battery capacity. This information is important to both inverter run time and solar battery charging times. Many people have found this video useful when determing overall battery bank capacity as well.