I just wired a solar panel with solar charge controller (SCC) and battery.
The photovoltaic (PV) voltage displayed on the SCC is 13V, even though the PV voltage without load that I measured with a voltmeter is 19V.
After that I tried to put two PV panels in series and I measured again and got 39V.
But after I installed SCC with battery and connected the PV panels, the SCC still shows the PV voltage at 13V. I measured with a voltmeter and got the same 13V.
Is there a problem with my SCC or my PV panels?