I see that some low end grid tie inverters are rated to begin inverting at 14V. Any reason these can't be used to prevent the a 12V battery bank from overcharging, such as having a series of 4 300w (derated to 150w) ones to sevice a WN500? These are less than $100 units. I've not seen or read of anyone trying this and it would not require relays.
It might work but there is one definite problem. What happens when the grid goes down and it will from time time.
That is an excellent point! One may need a relay that "unpicks" when the A/C is absent senting the DC to a passive load. An easy circuit. Thanks!
