So a simple rule will be to minimize 15% of your inverter's full capacity in order to get the maximum number of watts you can run with your inverter For example: Let's take a 1000W inverter with an 85% efficiency rate. 1000-15% = 850 watts. We created a comprehensive inverter size chart to help you select the correct inverter to power your appliances. Solar generators range in size from small generators for short camping trips to. . An inverter needs to supply two needs: Peak or surge power, and the typical or usual power. Surge is the maximum power that the inverter can supply, usually for only a short time (usually no longer than a second unless specified in the inverter's specifications). But the most standard rate is 85% so we'll take an 85% efficient inverter as an example So because of the inverter's efficiency rate, your 1000W inverter will have to pull 1150 watts from the battery if you're running it at its full capacity. The value is expressed in watts or kilowatts.
[PDF Version]