MPPT Charge Controller Sizing Calculator

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Check a proposed solar string against the PV voltage and short-circuit current limits on your controller’s data sheet.

Your inputs

Panels per series string Parallel strings Rated watts per panel Panel open-circuit voltage (V) Panel short-circuit current (A) Absolute Voc temperature coefficient (% per °C) Coldest expected panel temperature (°C) Battery charging voltage (V) Controller PV voltage ceiling (V) Controller PV short-circuit current limit (A) Controller rated output (A)

Results

Cold array open-circuit voltage
Array short-circuit current at rated conditions
Estimated peak charge current before clipping
Rated array power
PV voltage and current check
Output rating check

How it works

Series panels add open-circuit voltage; parallel strings add short-circuit current. Adjust open-circuit voltage from 25°C using the magnitude of the panel’s temperature coefficient. Divide rated array watts by charging voltage to estimate peak output amps before clipping.

Reference: Victron SmartSolar technical specifications.

What to check before you use the result

Use the lowest expected panel temperature and the model’s PV limits, including its operating and startup voltage range. A result within the entered limits does not check hot-panel voltage, connectors, or the manufacturer’s allowed array wattage.

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MPPT Charge Controller Sizing Calculator

Results

How it works

What to check before you use the result

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