Join Date: Jan 2003
Location: Maine Coast
Thanked 219 Times in 167 Posts
Rep Power: 16
Re: Repowering with an electric engine?
The larger issue, after the batteries, is re-charging them. Most offshore cruisers struggle to re-charge the house bank enough for day to day needs, often running the engine to help the solar and wind systems. Once you add a largish 48 volt bank for propulsion it becomes unmanageable.
We're not there yet.
Daysailing with the occasional overnight cruise and plugging in to re-charge at the home marina is about where it is now.
Not to mention you now have two battery systems, house & engine at two different voltages but no large current source that can be directed at either.
On a 34 footer I don't know that you can fit enough solar and wind to charge two banks adequately in the time frame you would want..
This is why e-power almost always requires a boat that is tied to a dock when done sailing or you wait a week or more between uses to recharge via solar & wind.....
By the time one gets done building a system like this a rebuild of diesel or an A4 looks like a Kmart Blue Light special in comparison..
This is not to say e-power can't be done, it can be dove very suitably if your use fits into the box.. Unfortunately "e" currently fits into a pretty tight box, range wise, for e only power. To do these systems right can be very expensive and then you still need to replace expensive banks every few years... The e conversion is only part of the expense if you also want wind and solar, and don't even think about the sub 1.5k wnd gens as they are plain and simply wallet drains.....
-Maine Sail / CS-36T
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