Wind generators not THAT powerful to create huge drag while sailing windward. And there are blades with variable pitch
, or removable blades, if needed. When sailing downwind. most boats will go much slower then wind, so there's some wind left for wind generator
. And at anchor
wind generators will take all wind which out there. So the point is - wind generators are not useless.
Regarding "that huge battery bank" (and "these expensive hi-efficient solar panels" for that matter) Smart sailor already has most of needed power on the boat, even without electric motors!
This is taken from other thread:
"We have 1400Ah LiFePo battery and 1800W solar.
We do like to do dumb things:
- Like running the water heater (every day staring in March, less often before) as the batteries are full in early afternoon.
-At least once a week we run the water maker for 5 hours straight (Spectra 400).
- Our $90 table top ice maker from Walmart runs every day for a few hours. But what do you care if the watermaker is on and the ice maker is running and there are still 30A+ going into the batteries.
We replace about 600Ah into our batteries every sunnay day. If the forecast
is cloudy for a few days we use a little less, probably about 400Ah per day. We still easily get 200Ah in on a very bad rainy day so with over 1000Ah usable we can go 5 very gray conseccutive days without giving up any comfort.
We have been at anchor
for the last 6 weeks, and at the same spot for six days now. So no charge at all from the engines lately. Anyway, you are lucky to get 30A going from the alternator
into the batteries when under motor
. And most of the time we sail."
(From here - Mounting solar panels
So all that smart sailor needs - just ADD few batteries to battery bank, few solar panels
, wind generators and related electronics
. Not to buy complete system!
But even the way it's set now, guy has excess FREE power everyday which he could burn, if he would have electric motors.
Regarding "That huge and expensive 20kwh battery bank is only really 10kwh usable unless you want to replace it frequently."
This myth also was busted many times already - modern batteries will allow much-much deeper discharge without any harm to them.
And I'd like to repeat - this setup will not turn sailing boat into power boat
with free power. But sailors do sail most of the time, am I correct? And it's not uncommon that if there's no wind, people just wait few days, not motoring - to save fuel, which is not cheap
nowadays. So even moving few hours per day on 4.5kW of power would be beneficial.
Also, when you guys calculating cost of having diesel motors, please calculate ALL associated costs. Diesel fuel, repairs
(oil, filters, belts...Don't forget - you still need solar panels and good battery bank to run boat devices and appliances
, otherwise you'll burn way more fuel in genset.