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Calculation Method:
Example:
Load: Lighting 20W + Laptop 100W + Smartphone Charging 6W + Coee
Maker 800W
Runtime: 2 hours
Battery voltage: 12VDC
Inverter eciency: 90%
Summary:
According to the above required load, an inverter of about 4000W is required.
When using the required load for 2 hours, you should choose a battery with a
capacity of at least 619AH.
Inverter Power
（20+100+6+800*4）/90% ≈ 3696W
NOTE: The coffee maker belongs to electrical
appliances with motor, which requires at least 4
times the starting power.
Battery Capacity
（20+100+6+800*4）/90%*2/12=619 AH
Simple Example Reference
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