Battery/Appliance Operating Times Calculator

Amp Hour (Ah) indicates the battery's storage capacity over a 20 hour period.  To determine how many constant Amps the battery can output for 20 hours, divide the Ah rating by 20.  For example, if you have a 200Ah battery, it can deliver 10 Amps for 20 hours before it is fully discharged (200 ÷ 20 = 10).

To estimate how long a battery/appliance combination will operate together, use this handy calculator.

1. Enter the voltage of your battery or bank of batteries. Battery Voltage
Voltage Amp Hours
12 50
12 75
12 100
12 200
2. Enter the total Amp/Hrs of the battery or bank of batteries. Amp/Hrs
3. Enter the combined Watt value of the appliances you plan to run from your battery. Watts
Examples Watts
19" Color TV 100
Blender 300
12V Blanket 60
Circular Saw 1500
Computer System 200
Microwave Oven 800
Power Drill 400
Toaster 1000
Represents actual power consumption as measured on sample products

Click the Calculate button to see the number of hours your configuration should run.

hour(s) of operating time, approximate. Based on fully charged batteries.

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