UL 1741 makes exciting a grid-tied inverter challenging without a grid. It also saves the lives of linemen working on your grid. If you have a UL 1741 approved with stand alone production capability, that's different. Read up on UL 1741, and let us know what type of inverters you have.
There are devices out there that can sense when your PV array is producing in excess of your home's present consumption. I ran across one not too long ago that was using a Raspberry Pi (small linux PC) to do the processing. EmonPi I haven't used it, but it looked entertaining, maybe someone else has used one?
|