// multi-utility computation suite · offline · instant · precise
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eng.PV-string-MPPT-sizing Calculator
Calculates the optimal number of PV panels in series and parallel strings for a given MPPT inverter input voltage range. The string voltage must stay within the MPPT voltage window at all temperatures — minimum string voltage at high temperature and maximum at low temperature.
Inputs
Voc V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Vmp V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
T Min C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
T Max C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Voc Tc Pct C
Reference formula or conversion factor shown for context.
Mppt Max V
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Results
Voc at min temp (cold Voc)
The value at the specified point or condition.
Vmp at max temp (hot Vmp)
The value at the specified point or condition.
max panels in series (hard limit)
Sample size or count used in the calculation.
safe panels in series (90% derating)
A standardised quality or risk rating on the applicable scale.
total string voltage (safe)
Electric potential difference between the two terminals (V). In AC systems, quoted as RMS — 230 V mains has a peak of ~325 V.