Sunday, October 31, 2010

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

 

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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