Solar string and MPPT calculator Solar string and MPPT calculator

Quick start

Check solar string voltage and parallel-string short-circuit current against entered controller limits.

  1. Enter module datasheet values and temperatures
  2. Set controller limits, series and parallel counts
  3. Calculate and review voltage and current checks

Solar string and MPPT calculator

Check a solar string’s voltage at cold and hot module temperatures, then compare parallel-string short-circuit current with the controller limit.

Calculator settings

Use module temperatures, not just ambient temperatures, and separate Voc and Vmp coefficients from the datasheet. Vmp is checked against the MPPT window; Voc against the DC maximum. A zero Isc limit leaves current unchecked. Startup voltage, irradiance, cables and protection are not modelled; verify the design with the manufacturer.

Module datasheet

Module temperatures

Controller limits

Series and parallel module connections

Voltage and current allowances

Solar string and MPPT calculator online

Find safe minimum and maximum photovoltaic module counts from inverter MPPT limits, DC voltage and temperature coefficients.

The result is an engineering or planning estimate. Verify critical dimensions, prices, limits and safety requirements before making a final decision.

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