Off-grid Solar PV system calculator

Use the online calculator below to work out the estimated battery bank (Ah)  and solar array size (watts) for your 12 volt off-grid  solar application.  This is basically the battery size and solar panel size calculators combined into one tool.

To use the calculator you need the following information: 

  • average sunshine hours for your location
  • the combined power consumption of your appliance(s) (W). Check the power brick label for the Volts and Amps. To obtain the Watts, use the formula Volts x Amps = Watts.
  • how many hours your appliance will be running for

Note: This is for a 12 volt system only. The results of this calculator should only serve as a guide

Related Topics

How to size a charge controller
How to size wire (AWG) for DC applications
How to choose an inverter