I thought about this option for a long time and finally just had a 3 cylinder Yanmar installed. I just posted a picture of it at the end of the Re-E-Power thread. There was just not enough duration and power on the pure electric units. The genset option just adds to the whole thing of something else to maintain, and at that point I just decided to get a standard diesel installation.
The 20HP Yanmar will provide all I need and is incredibly fuel efficient and remarkably quiet considering I was used to hearing a 30 year old Farymann.