Minimum input voltage for 3.6 Ecco
I have 4 panels on a string (405w panels with Voc 37.23 and Vmp 31.21) My inverter is a 3.6kW Ecco hybrid (SYNK-3.6K-SG04LP1) The inverter startup says 125V but the minimum MPPT voltage is 150V - is this ok? What happens if the string voltage is below 150V?
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The start-up voltage of 125V represents the minimum voltage that must be received from the PV panels (per string) to allow the inverter to start up when using PV. The MPPT controller will not start doing its magic until it reaches a minimum of 150V. While the inverter will run when the voltage reaches 125V, it will not operate very efficiently. This is why it is advised that you should try to install enough PV to reach the 150Vmp (plus a bit extra) so the MPPT controllers maximize the available power from the PV.