So i have been feeding my hot water heater with straight pv to a DC water heating element for a while. I have been trying to use a temp controller to keep water temps below 150 degrees. Works good and sometimes too good. With longer summer days my pv panels on the west side of my house generate power late into the evening. I have tried several relays but they have all failed. I am only pulling 20 amps and max 38 volts. Best results i have made is taking a decent relay increasing the spring pressure and also bending the contacts so there is more travel to separate the contacts to stop the dreaded green flame disconnect. Anybody working with some better relays.