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Hi Stu. No, I hadn't looked at the older thread but at first glance...that hurts my head. If the hot water tank is powered by shore power AND the dump output for the windgen, what happens if you're on shore power and the windgen hasn't been secured? Or, the shore power gets applied to the windgen dump somehow instead.
Sometimes I really like having donkeys doing the donkey work. Other times, I'm happier when there are no donkeys around, no inddor plumbing means no need to call a plumber at 3AM, no phones no heat...well, fewer service calls to worry about. (VBG)
Teaching a crew to flip a switch DOES seem like a good idea, but I give you this case study instead. A delivery truck (new company, new driver) backed into a loading bay, clipped the water main that stuck out three feet from the roof (!) and zigzagged elsewhere. Triggered the fire bell with the water pressure drop, FD arrived all set to go and disappointed to find no fire.
So the plant engineer got all pissed off and called a plu,mber to repair it--exactly the way it was before. I said, why don't you move the pipe, or at least put up some guards so it can't be hit again? And he said why? Why should he do that when the driver should just know not to back up on that side of the loading bay?
"Should", yeah. I like it better when there's a real engineer and the systems are built so they just CAN'T be screwed up. No matter how seasick, overtired, upset, and full of NyQuil you may be.
In this case...I think a second heating coil, or a hot water tank that used two coils, would be the answer. Hook up one to shore power, the other as a dump, and with any luck it doesn't scald anyone. (Another topic, huh?)
I keep thinking, I SHOULD be clever enough to design "one ring to rule them all", i.e. one controller that could handle all the power inputs and outputs, including wind and solar, and make them all play nice together. Should.