I recently purchased some new 200W solar panels that are rated at approximately 10A and 20V. Before I go ahead and install them, I'm curious if there's a way to test their output to ensure they're working properly. I have a Klein CL390 amp clamp to use for testing. Is measuring voltage enough, or should I also measure amperage? I've received mixed advice from AI on connecting the positive and negative leads to test with the clamp, and I really want to avoid damaging the panels during this process.
3 Answers
Since these panels are designed to provide 10A, it's safe to connect them and test the amperage. Just make sure to cover the panel with a fabric or sheet before connecting the wires to be on the safe side.
Another approach is to hook them up to your charge controller and see if they output power on a sunny day. I usually just check the voltage to confirm I didn't mess up my series connection calculations and to make sure the polarity is correct.
Forget about what you heard from AI! The simplest test you can do is to measure the voltage while the panels are in full sunlight. Just connect one voltmeter probe to each cable coming from the panel and set your voltmeter to DC. If you want a more thorough test, you can also short circuit the panel using a robust voltmeter set to DC amps. Don't worry, shorting the panel won't damage it, just be careful with the connectors—cover the panel while you're connecting and disconnecting to avoid any risk.
This is the best answer—quick and simple for sure!
If shorting is okay, why not just connect the positive and negative panel connectors and measure with my amp clamp instead?