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Example project: Gasse
We went on site to comission the system but it didn't pair the optimizers. As it was late and winter, we decided to do the pairing remotely later on when there's more light. When trying this, the pairing process failed and the DC voltage on the inverter indicated 0 V.
How did we figured out what the issue was? What were the steps we had to do in order to a) find out and b) resolve the issue?
Inverter indicating OV DC - this means strings are not connected to inverter or there is wrong wiring polarity.
Checking on the GAK wiring you can see if wires are connected properly (even if string voltage is good on roof).
Always need to check where wires should be connected on labels. In this case wires were connected wrong.
One can see in the picture that they have labeled the black cable with + and the red with minus, which was not correct.
When measuring the voltage, the red wire was +24 V (24 optimizer) and the black wire was minus.
This is how it should have been done:
