Drok, tnx for your reply…
Voltage: the inverter, Western Co. Leonardo System 4kW/3000/48V, support an inuput of max 150v for each string.
Current: the inverter support max 13A for each string.
So I suppose that 4 panels will never exceedboth this values.
I need two DC power meters, one for each string.
ciao
S.