DCACPOWER  Frequently Asked Questions
Watts Used by Common Appliances and Tools (Usage Chart)
For this application, you would minimally need a 500 W inverter, and should give some thought to a larger one, as there will likely be a time when you wish you'd bought a bigger model ... in this example, you might decide you'd like to run a fan while you compute, or let the kids watch TV. Longer Answer: Determine Continuous Load and Starting (Peak) Load: You need to determine how much power your tool or appliance (or combination of them that you would use at the same time) requires to start up (starting load), and also the continued running requirements (continuous load). What is meant by the terms "continuous2000 watts" and "peak surge4000 watts" is that some appliances or tools, such as ones with a motor, require an initial surge of power to start up ("starting load" or "peak load"). Once started, the tool or appliance requires less power to continue to operate ("continuous load") 
Helpful formulas: To Convert AMPS to WATTS:
To Calculate approximate Startup Load:
Most often the start up load of the appliance or power tool determines whether an inverter has the capability to power it. For example, you have a freezer with a continuous load of 4 amps, and a start up load of 12 amps: 4 amps x 120 volts = 480 watts continuous You would need an inverter with peaksurge rating greater than 1440 watts. FORMULA to convert AC Watts to DC Amps: AC Watts divided by 12 x 1.1 = DC Amps 

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