JBertok
Network Engineer
Solar Edge optimizers are each an MPPT DC-DC converter, with communication back to the inverter, but they even work with a non-SolarEdge inverters since they function autonomously. The optimizer emulates a solar panel in the string. The number of amps that passes through each optimizer in series will always be the same, as with the panels. The optimizers boost the voltage pressure like a panel would.
The SE7600A-US inverters each have input maximums of 500V DC and 23.5A
There are two power output level maximum for the different models of Optimizer- 60V or 85V DC. And then there are different models specific to the panel cell count and the silicon type, but all optimizer models are limited to 15A maximum output.
SolarEdge Inverters control the total string voltage and the voltage output of the optimizers.
The only Voc from the Optimizers is 1V which they default to when disconnected from the the inverter MPPT. So, they prevent higher than operating voltage from hitting the DC feeds into the inverter - only the optimizer itself has to be exposed to Voc of the unloaded panels, and those ratings are from 48, 60, 80, 87, or 125V DC maximum depending on the model of the optimizer.
The panels are probably strings of 18. This could be confirmed by opening the disconnect at the inverter and seeing 18V. While running, if you're seeing 440V DC at the MPPT inputs that would mean 24.4V from each optimizer average. Assuming the inverter is running at 100% output of 7600W and 97.5% efficiency, plus a 98.8% optimizer efficiency, that would mean a harvest of about 220W per panel, and you should be seeing about 8.85A on each of the two MPPT inputs per inverter if the string voltage is holding at 440V.
The SE7600A-US inverters each have input maximums of 500V DC and 23.5A
There are two power output level maximum for the different models of Optimizer- 60V or 85V DC. And then there are different models specific to the panel cell count and the silicon type, but all optimizer models are limited to 15A maximum output.
SolarEdge Inverters control the total string voltage and the voltage output of the optimizers.
The only Voc from the Optimizers is 1V which they default to when disconnected from the the inverter MPPT. So, they prevent higher than operating voltage from hitting the DC feeds into the inverter - only the optimizer itself has to be exposed to Voc of the unloaded panels, and those ratings are from 48, 60, 80, 87, or 125V DC maximum depending on the model of the optimizer.
The panels are probably strings of 18. This could be confirmed by opening the disconnect at the inverter and seeing 18V. While running, if you're seeing 440V DC at the MPPT inputs that would mean 24.4V from each optimizer average. Assuming the inverter is running at 100% output of 7600W and 97.5% efficiency, plus a 98.8% optimizer efficiency, that would mean a harvest of about 220W per panel, and you should be seeing about 8.85A on each of the two MPPT inputs per inverter if the string voltage is holding at 440V.