05-31-2020, 05:01 PM
You are correct Clarke. You could use 1 amp for 250 hours or 10 amps for 25 hours or any other combination within reason. High amperage draws present their own issues but you have the concept. Look at the various lights, tv's, microwave, etc that you use, calculate the number of amps each draws, multiple that times the amount of time you think you will use that light or appliance per day and you can determine how long it will take you to use 250 amp hours. Since many of your loads are AC, you have to use an efficiency factor for the inverter to convert DC to AC.