From the bloggers at RV Travel.
If you’re considering adding an inverter to your rig, or already have one, it’s important to keep in mind the battery power you have available. Nothing can ruin a spot of boondocking quicker than killing off your “house” batteries. Replacing deep-cycle batteries is an expensive proposition, and a bit of quick math can help you prevent the problem.
To get started, you’ll need to know how many amps your shore power equipment will use. This can typically be found on the manufacturer’s ID plate on each appliance. The plate may list amps, but in many cases, power consumption will be expressed in watts. You’ll need to know the figure in amps, so here’s the method for figuring amps.
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