Hi
Firstly, you have the cheapest electrical supply in the world in hydroelectric so that can be your recharge source but you can't take that on your boat so it's down to whether you can afford a system that can be recharged for a round trip, or it's a series hybrid system for the boat.
To get 10 knots (if you're getting it now comfortably with 50hp ice) a 15-20kW 3 phase a.c. electric will do the job (I replaced two 50 hp diesels with two 15kW motors, 15 ton displacement hull, target speed 6-10 knots.) How much battery you need for that depends on lots plus the type of battery determines how much you can/should flatten them between charges (d.o.d.).
There's plenty of experts here who can calculate that for you and Mike and other sites eg Fisher Panda can provide online fill in the blanks calcs to at least let you know what you're up for but the advice about reading and absorbing first was good.
Start with the theorists but finish with the practitioners, as any experienced knows the two can and do often diverge.
Cheers
Hello my name is Gerry Boy from Esperanza B.C. Canada
I am researching E-boats and I will be doing a project with the local high-school building a RedWing 23 hull into an Electric, inboard most likely, although we could do outboard as the hull is all ready set up for it with a well.I also would like to eventually build an electric (probably hybrid) vessel that would meet the needs of Esperanza which is a non-profit organization (Boat in only community) which does summer camps and other workshops and programs for healing and restoration here in Nootka Sound on the west coast of Vancouver Island. That would be a 12 passenger vessel hopefully attaining a 10 kt. cruise for a min 2 hour run time as it takes about 40 min. @ 10 kt. to get to town one way.Electric makes sense for us because we produce our own hydro electricity via Pelton wheel and we spend thousands on fuel each month to run our small fleet of boats.I would like to learn more about electric systems as I am not very experienced in that field. I would also like to hear about peoples real time experiences with different systems and hull shapes, battery banks, motors, etc.My biggest interest is in the area of efficient semi-displacment and low displacement / length monohulls.Thank you for having me in the groupGerry
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