Re: [Electric Boats] Re: converting a 42 foot sloop to electric propulsion

I agree, especially in salt water sailing. An overturned boat will
produce chlorine gas .....

Steve Spence
Renewable energy and self sufficiency
http://www.green-trust.org
http://arduinotronics.blogspot.com/

On 11/28/2010 11:08 AM, spincraft6 wrote:
>
>
> I would suggest the use of AGM batteries not repeat NOT 6 volt golf cart
> batteries( unless you want to accumulate hydrogen gas below decks and
> create a really exciting situation ) For engine configuration and size
> --charging systems-- and hybrid options- Suggest you contact me at
> spincraft6@gmail.com <mailto:spincraft6%40gmail.com>
> Holden
>
> --- In electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com>, "Mark n Angela"
> <mstafford@...> wrote:
>>
>> Rob(Wilk) [or is that Rob(Wild)?]
>>
>> Mark Stafford here with a similar sailboat: H55 (longer, narrower,
> electric). Do-able, fairly cheap, quick and easy. It took me much
> learning and planning, but only a few days of work.
>>
>> Now the bad news: every electron counts. No wasting energy, if you
> want that performance. 4 knots will more likely be your "sweet spot" in
> terms of range/safety margin. Use at least eight NEW 6v golf cart
> batteries (preferably 16). 48V system, gear or belt reduction, optimum
> prop diameter (15?% prop tip clearance), brushless permanent magnet
> motor(s). Everyone likes regen, but no-one relies on it: one hour of
> fast sailing will get you 1 minute of cruise power.
>>
>> More bad news: use Paktrakr, ampmeter, voltmeter, marine GPS,
> knotmeter, maybe CycleAnalyst and RPMs too. With electricity, you can't
> make intelligent decisions without information.
>>
>> Can you cannibalize a golf cart? Yes, but expect 1/3rd your desired
> performance. Arby Bernt and James Lambden are the kings of efficiency,
> having spent years optimizing. ThunderStruck and ElectricYacht are great
> sources of parts/systems. There are more: check the "links" section on
> the left side.
>>
>> This ElectricBoats YahooGroups list is indispensable! You have used it
> perfectly.
>>
>> FLA batteries are great on sailboats, especially if they are oriented
> posts-fore-and-aft. The tipping back and forth (tacking) keeps the
> electrolyte well mixed for even plate charge-discharge cycles. Hydrogen
> rises (let it escape!).
>>
>> Call me or anyone else. We are here to learn/share.
>>
>> Mark Stafford
>> mstafford@...
>> 925-586-0839 cell
>> GreenMarineRePower.org
>>
>>
>> --- In electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com>, "robwilk37" <robwilk37@> wrote:
>> >
>> > hello...
>> > first post and havent done any searching yet but thought id toss
> this project into the mix. ive got a 42'LOA, 32'LWL, 19,000 pound sloop.
> cut-away fore foot/full keel. barn door rudder with prop aperture. shes
> and old school cca design with beautiful (to my eye) lines, and a bare
> hull restoration. and since i dont have a diesel id like to incorporate
> and electric drive.
>> >
>> > my requirements are as follows...
>> >
>> > the boat will be a liveaboard cruiser. not interested in racing, and
> the bottom will always be impeccably clean (its a pet peeve).
>> >
>> > i only need 75% of hull speed (@5 kts) for 2 hrs a day, basically in
> and out of the slip and down and back the fairway.
>> >
>> > i can charge from a shore chord but will have some solar/wind/towed
> log charging when anchored out.
>> >
>> > i like the idea of regen capability while underway.
>> >
>> > i dont mind carrying a gas/propane genset for emergency/general
> charging or continuous running in flat calms.
>> >
>> > im quite handy and can do all the work myself.
>> >
>> > so...ive only got about 5,210 questions. among them...
>> >
>> > can i cannibalize an electric golf cart and "marine-ize" as much as
> possible and fullfill the above requirements?
>> >
>> > ive got deep bilges, do i put one big forklift battery down there or
> are many smaller ones a better idea?
>> >
>> > i like lead/acid as they are cheap and available worldwide but how
> do they hold up to the sloshing around and outgassing in the bilge? and
> 24 or 48vdc?
>> >
>> > roughly how large a battery bank for propulsion only would i need
> and how big a prop (3 blade i presume for the regen) and what size motor?
>> >
>> > and if these questions are too basic for this forum just point me in
> the right direction and ill get out of your hair. thanks so much in
> advance for any help..
>> >
>> > rob
>> >
>>
>
>

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