Watt hour calculator (26ah 40ah 100ah)

Formula is as follows

Amp of battery x 12 volts = watt hours

Then you add an “inefficiency factor of .75”

Example:  26ah x 12volts (*inefficiency factor of .75) = 234 watt hours . 

Example of customer setup: Computer and monitor amounting to 60 watts (usage). 

60 watts usage would be 234 watts hours divided by 60 watts usage = 3.9 hours.

To figure out how much a customer would need in terms of watt hours take customer setup and multiple by hours needed

Example: 30 watts x 8 hours would be 240 watt hours.