Safe way to fault-test voltage of panels IN SERIES?
When you google you find lots on
- voltage testing of an individual panel
- warnings not to test multiple connected panels
- one video describes testing panels connected parallel.
Here, and nowhere though, I found a way to SAFELY test voltage of panels IN SERIES, does any electrician know?
So I have just 3 panels, connected in series (for higher voltage serving a 24V offgrid battery bank), and all has been working flawless for 2 years. Despite that, from the start I noticed that when I lifted the panels more horizontally towards the sun (we have an ingenious flexible mounting on the rear of a mobile home) then there appeared to be a loose connection somewhere.
Never found where, so I just left them in a bit lower position, and all has been fine.
Now however when I lifted them to a higher position, I somehow caused a permanent disconnect in the wiring/connections.
Measured each panel individually, all 3 are still working well: 19.6V
Measure at the end of the cables inside the tiny house however, the 3 combined now only bring in a few millivolts.
Cables look intact.
I am wondering how to find with my multimeter the fault in the connectors between the panels. What is a safe way, where may I touch the probes on one end of the series and on the other end of the series, anyone knows?