When the MC4 connectors are disconnected under a load, the resulting arc will damage the contacts and ruin the connector. 1x is all that's needed. The contacts we never deigned or intended to operate under load, and good practice dictates that systems be powered off when changes are being made. If you had a DC disconnect at the combiner box or charge controller, you don't have to cover panels.
If you have a combiner box, you can do most troubleshooting from there. (I have 5 strings on my system, and I can switch 1 on at a time and measure it and compare against it's brothers and get an instant verification they all are working)
The other issue, is naive users attempting to engineer and diagnose a system they have no background in. This leads to damaged connectors that can/will overheat on your roof, and then the pitchforks and torches come out (thank you Mary Shelly) and the revolt against the "fraud solar stuff" begins.
But this not what we want to see. Get the Dummies Handbook for Solar, either print from the bookstore, or an online download. Read it. Lean the basics, which are way too much for you to trust "strangers on the internet" and too complicated to provide electricity lessons on the internet from this forum.
If you have a combiner box, you can do most troubleshooting from there. (I have 5 strings on my system, and I can switch 1 on at a time and measure it and compare against it's brothers and get an instant verification they all are working)
The other issue, is naive users attempting to engineer and diagnose a system they have no background in. This leads to damaged connectors that can/will overheat on your roof, and then the pitchforks and torches come out (thank you Mary Shelly) and the revolt against the "fraud solar stuff" begins.
But this not what we want to see. Get the Dummies Handbook for Solar, either print from the bookstore, or an online download. Read it. Lean the basics, which are way too much for you to trust "strangers on the internet" and too complicated to provide electricity lessons on the internet from this forum.
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