How Do You Calculate Battery Watt Hours. Note down the voltage. A 12 volt 50 Ah battery 50 Ah x 12 volts 600Wh.
So if a 5 Volt battery has 20 Watt Hour rating and it draws 2 Amp current then the Watt delivered by Battery 10 Watts 5 Volts x 2 Ampere. Note down the voltage. So that string provides 48 x 100 4800 or 48 kWh of energy.
If your lithium batteries do not have the watt-hour rating clearly marked on them and the information is not included on a specification sheet you can do some quick math to determine the watt-hour rating yourself using some other information commonly found on the battery.
20W water pump on for 20 minutes equals 666 watt-hours. 10W radio on for 5 hours equals 50 watt-hours. You may need to know the watt hour Wh rating of a lithium battery to determine how it should be shipped or to ensure you conform to regulations regarding air travel with lithium batteries. 20W TV on for 2 hours equals 40 watt-hours.
