MPPT Sizing Calculator

This calculator helps you determine the appropriate MPPT solar charge controller based on your solar panel configuration and battery bank voltage. It provides a detailed step-by-step breakdown of the calculations performed:

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Assumptions and Calculations

Here are the assumptions and mathematical formulas used in this calculator:

• Total Power (Pmax): The total power is calculated by multiplying the wattage of each panel by the number of panels in series and parallel:
  Total Power = Panel Wattage × Number of Panels in Series × Number of Panels in Parallel

• Max PV Voltage (VOC Total): The maximum voltage of your solar array is calculated by multiplying the panel’s open circuit voltage by the number of panels in series and applying a temperature correction factor:
  VOC Total = Panel VOC × Number of Panels in Series × Temperature Correction Factor

• Max Charging Current (Imax): The maximum charging current is calculated by dividing the total power by the battery charging voltage:
  Imax = Total Power ÷ Battery Charging Voltage (e.g., 14.5V for a 12V system)

• Short Circuit Current (ISC Total): The short circuit current is determined by multiplying the panel’s short circuit current by the number of panels in parallel:
  ISC Total = Panel ISC × Number of Panels in Parallel

 

Need help determining your solar panel size requirements? Check out our solar panel calculator.