An inverter converts DC power from an external power source into AC power. Choosing the right size of inverter depends on the power requirements of the appliances you expect to operate at any given time.

     You should consider both the continuous and surge power rating of your appliances and/or lighting. The continuous rating must be high enough to handle all the loads that may run at the same time. The inverter must also be capable of handling the starting surge of all loads that may start at the same time. Loads typically take many times their continuous rating to start.