The minimum string size, then, is 15 modules. The maximum string size is the maximum number of PV modules that can be connected in series and maintain a voltage below the maximum allowed input voltage of the inverter. The Module Voc_max is calculated using the coldest temperature when the modules produce the highest expected voltage.
Here are the results we calculated: This inverter has 2 MPPT trackers, so a total of 2 strings can be connected to the inverter. We know that there can only be 13 modules maximum installed. We can have one MPPT with 6 modules in a string and the other at 7 modules in a string. Check out UpTop Solar String Sizing Tool that does this for you!
Maximum String Voltage: Ensure the total Voc does not exceed the inverter’s maximum DC input voltage, typically 600V or 1000V for residential and commercial applications. MPPT Voltage Range: The inverter operates efficiently when the Vmp of the string falls within its MPPT range (e.g., 250-850V for utility-scale inverters).
(Inverter Min Voltage) / ( V low) = Minimum String Length Ensure that the highest voltage during the lowest temperature is within the inverter’s max and near the upper MPPT range. Find the low ambient temperature for the site and calculate the high voltage per module using the Voc and Tvoc with the following equation:
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