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Will, after looking into the winter storage question, it's pretty clear that one bad event would be CHARGING THEM BELOW 32 degrees F. Apparently you get some crystals that pierce the internals and can theoretically cause really bad issues.

for setup, always connect the battery first, then the solar cells. for shut down, always disconnect the cells first. Basically, I never want power going into the controller with no place to put it, correct? Hey, one more question while I have your attention. I currently have 4 100 watt cells...

Does this seem like a good solution for switching both? renogy rover li 30 amp

Yes very interested in this too. Am mounting a stationary grid on a metal roof. Is it necessary to do copper grounding wire? And the topic of grounding the electrical system itself is new to me.

makes sense. Was hoping to make up for poor angling with more cells.

So, I have a Renogy Rover 30a controller being fed by 4 100w panels charging a 12 V battery bank. This puts me near the theoretical limit of what my controller can handle. E.G., 400W/12V = 28.57 amp output, near the limit. However, my solar cells are considerably off-angle. I've never seen...

Voltage is a great point. I have four in series and adding a fifth would often exceed 100V. I should be able to fix by doing a string of 2 and a string of 3, connected in parallel. Right?