Simply divide the inverter’s maximum system voltage rating by the open circuit voltage (Voc) of the module used and you’re good. Well, that does get you in the ballpark, however, you could be at risk of over-sizing or under-sizing the number of modules in a string depending on where you are located in the world.
Voltage measurements typically begin at the string level in a combiner box or in an inverter’s wiring compartment. Insert the meter’s leads in the corresponding receptacle (red and black). Select the DC voltage setting on the DMM above the expected voltage at the location based on the system specifications and documentation.
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).
The maximum number of modules in series can be as much as 11. Now we have all the parameters that we need to design a system which will not go over the maximum input voltage of the inverter at record lows and will meet the minimum start-up voltage of the inverter where cell temps are at their highest.
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