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Appliance Calculator for Battery Operating Times To estimate the time an appliance will operate with a given size battery: select battery Voltage, enter the batteries Amp hours and Wattage for the appliance(s) and then click Calculate: 1) Select the Battery Voltage. Battery Voltage 12 Volts 24 Volts 48 Volts 2) Enter the total Amp Hours for the battery. (use the chart below for examples) Amp Hours 3) Select or add up the Wattage value(s) for the appliance(s) to run on battery. Wattage 4) Click the Calculate button to estimate the number of hours the appliance(s)should run. Approximate hour(s) of operating time on full battery charge to 50% discharge: Battery Type Voltage Amp Hours 22 NF 12 50 24 NF 12 75 27 NF 12 100 8 D 12 200 Appliance Watts Color TV 100 VCR/Stereo 85 Washer 630 Fridge 785 Computer 150 Microwave Oven 800 CLF Sign Lamp 36 CLF Lamp 7 Actual power consumption may differ - Refer to equipment manufacture label. If you find this calculator helpful let us know...Email Get Greening Up the world one watt at a time Home  |  Window Film  |   Solar  |   Wind     ContactUs  |  Employment  |  Links