Friday, October 2, 2009

[Electric Boats] Re: New member - 37' sailboat

 

Hi Brad,

You mention regeneration as a power source. Am I correct in remembering that the Alberg 30 has the prop in an aperture? Since your boat is already converted, have you been able to generate any power into your batteries under sail? If so, what kind of charging rate were you getting? It's my understanding that the reduced flow around a prop in an aperture really cuts down the already limited power that is available through regeneration.

Many people have reported regen of somewhere around 100 - 150 watts with fully exposed props, and 100 watts is less than 2A of charging with a 48v system. On the electric condo cats, some people have reported that the regen really slows the boat down, as much as 2kts or more, but they do have 2 props, twice the drag.

On my full keel Bermuda 30 ketch, I'm going to skip the regen aspects and focus on other efficiencies to get maximum range.

Fair winds,
Eric
1964 Cheoy Lee Bermuda 30 - Serenity (being converted)
Marina del Rey, CA

--- In electricboats@yahoogroups.com, "BA" <oconnell_brad@...> wrote:
>
>
> Hello JB,
>
> I recently repowered my Alberg 30 with a system from Electric Yacht(www.electricyacht.com). They provide a great plug and play motor, controller, battery monitoring system, along with coupling to the existing shaft.
>
> There are multiple alternatives for regeneration, not limited to wind or solar.For example, the unit from Electric yacht will regenerate under sail, simply by allowing the prop to turn. The motor becomes a generator. This is ideal for offshore and longer passages.
>
> If you want I'll send you the contact information of the guy I was dealing with there.
>
> best regards, brad
>

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