When I'm out messing with the panels on a sunny day, I'll take a sheet of cardboard
with me to block off the bottom of one of the panels..
That way, I can use the cut-off toggle switch to kill the power out, without toasting the switch contacts..
It's actually much safer to just do the work after the sun goes down..
I was thinking about one of these Contactors for controlling the power going into the hotwater heater element..
White Rodgers 120 114751 6 Coil 24V DC 120 904 Heavy Duty Contactor New | eBay
But, maybe a big MOSFET would be better.. Only need to handle 10A max..
This is an
Off-Grid experiment. Any inverter that can take 122 volts is out of my price range anyways..