A 100Ah battery can support a 1000W inverter for roughly one hour. . Most 100Ah batteries are 12V, but some systems may use 24V. Power Rating of the Inverter (Wattage) Inverters are rated by their continuous power output in watts (W). The right inverter size depends on how much. . A 100Ah (amp-hour) battery delivers 100 amps for one hour, 10 amps for 10 hours, or 1 amp for 100 hours, depending on the load. Actual runtime depends on load wattage and battery voltage. For example, a 600W load would run ~2 hours at 12V, factoring in 90% inverter efficiency.
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