I am receiving lower voltage and current than expected when panels are connects to my MPPT 100/50. Full sun.
4 x 150w Panels (Voc = 20.9, Isc = 9.39) each tests around 20 volts and 5.5 amps when not connect to the MPPT.
Here is the reading for the whole system as diagrammed. When not connected to the MPPT each pair of panels in series reads 40V. The power is about half of expected.
For simplicity I also tested just one panel to the mppt through the fuses and breaker. Reads 20V at the leads before connecting them into the MPPT, however when connected the voltage reads at 15 and I get about half the expected current in bulk:
Is there something I am missing that I can test? Could this be an MPPT hardware issue? Thanks for the help!