Have 260 watts of solar production in two panels wired in series. Panels are in a fixed horizontal position and unshaded except by the mast
if heading toward the sun. Battery
bank was two 6v Golf Cart batteries about 220 amp/hr. Current
draw is fairly low, no refrigeration
plotter and AIS
on 24/7 with intermittent Ham Radio
, Pactor Modem
and computer usage as well as LED cabin
and running lights. On the sail to Hawaii
, the panels didn't keep up with consumption
for the first 12 days of the trip because of heavy overcast. By the 12th day batteries were down close to 12v Once the sun broke out, the panels began to charge the batteries back up though hadn't gotten to full charge by the time I arrived in Hilo after 15 days. Lack of sunshine puts a serious crimp on the output of solar panels.
Look at the production posted by thomasow. Note the significant drop off in production between October and May. That's because of overcast and shorter days. Doubt that solar panels would do the trick in the winter unless you had a ton of them. In the summer, production will be gang busters especially if they could be tilted to better capture the rays. How feasible solar would be as your sole source of electrical
generation would depend on when you'll be cruising.
Wind will probably be next to useless in the summer. Windmills take at least 10k wind to produce any electricity and really don't begin to turn out significant juice till north of 15k. My experience with the PNW summer is winds are usually light and below a windmills minimum needed wind velocity. In the winter, Wind may be more viable which would be nice addition to the slumping solar output.
So the answer is have both if you need year around production. Solar Panels alone if it's just summer cruising.