OK an update..made it through winter with the Arduino as originally configured..couple of issues..The start voltage set at 11.4 as recommended by members saved the day, it operates flawless. Couldnt have made it off the grid without it. Now that the weather is warmer there is a slow drain due to the lights and tv and etc. The inverter kicks out at 11.6 which is not adjustable. So I am setting the start voltage to 11.6. See what that does.
I am working on version 2.0. It will tie in a load sensor, touch screen and thermostat.
I added a stand alone system to the hot water complete with flow sensors. Turn on the hot water and a solenoid diverts the water to the cold water line via circ pump until temp is reached.. It works ok. Needs some tweaking.