How to test a solar panel？
Incorrectly testing solar panels can sometimes lead to inaccurate results when trying to diagnose a fault. Below are the correct ways to test an unregulated solar panel. (Redarc’s BCDC, LFP and BMS ranges need to see a 12V nominal unregulated solar input; The below test procedures and results are based on this).
2 x 12V 21W globes in series or 1 x 24V 55W incandescent globe with wiresattached
Things also needed:
The specifications of the solar panel being testing: the Open Circuit Voltage (VOC) and Short Circuit Current(ISC). Most of the time these are detailed on the back of the solar panels.
SUNLIGHT!!!!! Testing solar panels either at night time or in poor sunlight conditions will give false and misleading results. For the best and most accurate performance indication, full, bright sunlight is required directly onto the panel.
Ensure the solar panel is disconnected from a regulator and battery.