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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@... <mailto:spincraft6%40gmail.com>
Holden

--- In electricboats@...
<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@...

<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