Inverter input voltage 400v

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A SolarEdge inverter can only be used with SolarEdge Optimizers. The optimizers determine the voltage. There is a minimum of 8 optimizers per DC string and a maximum based on the nameplate power of the solar panels in that string. Forget about calculating voltages from solar panels and just follow the Solaredge instructions in this respect. Look at the optimizer datasheet and installation instructions for more info.

There is really just one input, with two parallel sets of terminals. If you connect two strings in parallel to those terminals, the optimizers will make the voltage of the two strings match, as long as you are within the guidelines I've described above.
 
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