FilterGuy
Solar Engineering Consultant - EG4 and Consumers
Wow! If it is getting hot when the switch is in the "ALL" position then there is a fair amount of resistance across the '2' circuit in the switch. What voltage are you seeing across the resistor?The other reason to not keep the pre-charge circuit on (for me at least) is that my 20Ohm 50W resistor gets hot enough to not be able to touch even in my 24V system. If you're going to leave it connected, you need to think about that heat.
Edited the position 1 statement
Even in the position 1, the current drop off to near zero very rapidly and not get hot.
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