Rich... I have a fourwinds by everfair and it has given me excellent service over the last few years as well as being nice and quiet (which also has a lot to do with how it was mounted). In 10-15 knots of wind you should be able to generate all the amps you need and then some...but in less than 10 knots you''ll have to run the engine a bit. Remember that many people pick anchorages that are out of the wind. My own solution was to add solar panels (2x80watt) which give me 40-50 amps most sunny days...the combination of wind and solar power works for me.