Thanks for a nice controller!
Here's what I'm doing with them:
I use it to cut on/off a solid state relay which is connected to the AC side on the inverter, my littler experiment proves it gets enough power to a smaller water heater for "preheating water"....many folks help me on this one... again thanks to everyone!
Yesterday we had some good winds and the 17 footer was doing a swell job heating water. Butwith the current setup I could not dump enough power on the AC side of things to keep up.....So I kept the DC dump in place too, so before my inverter could kick out due to over voltage; the bank of resistors ( set a bit higher for dumping) on the DC side would drop the power down, just before it could kick out.
I think I will keep both systems in place.