[see
Forum Thread this is taken from for more]
How Big should my inverter be?
The inverter will have a
continuous rating and a
peak rating. The
continuous should be greater than the sum of all simultaneous devices at their peak rate. What watt meters won't tell you is the startup draw of devices. This can frequently be 3 or 4 times the maximum power listed on the devices label.
Example: For the fridge above you want at least a continuous of 130 watts, and probably 3×200=600 for the peak rating. To be safe add 120%, so a 150W continuous inverter with 600 watt peak.
