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Dropout voltage for a HH52P series relay is 10% of rated DC coil voltage which is 2.4 V. Ought to be good. Might want to secure the relay to the socket so it doesn't vibrate out. I don't see a locking bale on it.

Direct sunlight make a huge difference in solar panel output. With indirect sunlight my solar panels put out 150-300 watts. With direct sunlight they kick out 1,700 watts.

There are drain holes located under the battery trays. There may be more that I'm not aware of.

The max resistance that I get on the voltage Pot on my 802 is 2.111 K ohms I suspect if you remove one of the Pot's wire from the voltage regulator terminal 1 or 2 the max resistance measured at the Pot will probably be ~5 K. The internal resistance of the voltage regulator is in parallel with...

You'll need to use toggle switch's with a higher current rating. Your individual 4,500 watt elements are going to draw 18.75 amps. You ought to select switch's that have a safety margin above the nominal current being drawn.