Monday, June 8, 2009

[Electric Boats] Re: 29' CAL Looking to switch to EV



Hi Randy,

Welcome! I have a boat very similar to yours that I converted to electric a while back. When you say the Westerbeke is underpowered - can you elaborate? What kind of speed do you get at full-throttle? At cruising-throttle? And if you know the size and pitch of your prop that will also help.

Also please describe the sailing conditions (typical, as well as worst-case) - currents, wind-patterns, etc.

We also need some sense of how much speed and range you expect (without auxillary power like a genset). On your weekend trips - will you have access to shorepower?

The Thunderstruck kit is not intended for direct-drive - they just leave the mounting as an exercise for the reader :) Note that there are vendors with more turnkey systems, but are priced accordingly. This system will typically need a 2:1 reduction.

Best-case - you are looking at about $3K for a setup (motor/controller, batteries, cables, trays, meters, transmission, etc) including a lot of DIY effort. You probably already know you can replace your w-b for about the same or less.

The pros and cons are going to depend a lot on you and your expectations. Your inclination to being fastidious (I am not) and detailed oriented (ditto) will mean a lot. Mechanical/electrical skills also count (much to my dismay).

It is helpful to put electric in context - think about all the trips you have taken - now imagine you started with 1 gallon of fuel and think about how the trip would have changed.

Regards,

-Keith
e-S/V "Aja" - 1978 Hunter 30
San Francisco

--- In electricboats@yahoogroups.com, "r.ramjet@..." <r.ramjet@...> wrote:
>
> I have a westerbeake 1 lung 9hp diesel that is woefully underpowered. This winter the JB Weld that was dealing a cracked block in the water jacket sprung a leak. It is now time to take a serius look at an inexpensive EV system.
>
> I looked at the Thuderstruck page and it seems to be the cheapest and fairly simple to install.
>
> We pretty much do day sailing with some weekends in the plans.
>
> It also looks a\like a direct drive system rather than a belt system.
>
> Can anyone enlighten me on the pros and cons?
>
> Thanks
> Randy
>

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