Hi Eric,
I have been green since 1990 using off the shelf trolling motors and batteries. The motor I use now has 30 pounds of thrust and I find that lacking in heavy seas and winds. My latest project is my 1987 Compac 16' that displaces less than a ton I believe. Not sure on the math on that but a small day coastal cruiser/weekender at best. I am planning to move to the coast to retire in the next 10 years or so and know from my many years of offshore sailing that 30 pounds of thrust is not going to cut it AT ALL! It's ok for the lake where I sail now, but offshore if I have to high tail it to safety then Scotty I need more power! I have fallen out of love with gasoline motors, the mess, stench, the constant whine, and explosive qualities I can do without in such a small package as the Compac.
Don't laugh at the little boat, she is down right bullet proof and half submarine with a re-enforced hull and bulkheads below. So she will have the top sides redone with Bo-mar hatches. A poop deck to shed following seas and add room to the below deck. Just part of the transformations she will go through. One of modifications is the propulsion systems.
Now digging around I found Torqeedo outboard and this seems to be closer to my needs. Fact is the Compac is rated for a 10 horsepower gas outboard motor. It is common place for the Compac to run 2.5- 5 horses and a modified prop for more torque vs speed. A 4 blade speed prop is common. Hull speed under sail or motor is 5-7 knots but she is a real tug boat when it comes to towing anyone. Of other owners I have interviewed they say that the 4 blade 5 horse is enough in heavy seas to fight a current and make port.
I am looking for more information in this quest about other options, manufacturers, longevity, expected power drain, charging systems, solar panels, possible 110 power sources, generators, etc. to make this boat self-sufficient on weekend getaways.
Looking forward to everyones input!
Adam
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> Hi cptstarz1004 (?)
>
> You should really start by thinking about the boat, rather than the engine that happens to be in it. Typically, an electric drive should be about 1kW of rated power per ton of displacement for sailing auxiliaries.
>
> Without any information about your boat, I can say that the 5.5kW (7.3hp) drive that I purchased from Propulsion Marine is more powerful than the Yanmar 12hp diesel that came out of my boat.
>
> You may find that solar is good for charging your boat while you're away, but most reasonable size arrays won't drive your boat very fast by themselves. It all depends on how you use your boat.
>
> Batteries can be bought at Walmart, battery stores, marine stores or online depending on the batteries that you want. The rest of the drive can be purchased from electric boat vendors that you can find online for complete systems, or from EV vendors for random components that you can try to figure out how to make work in your boat. If you go the full DIY route, you can find help online, including in this group.
>
> But first, let's hear about your boat and how and where you intend to use it.
>
> Fair winds,
> Eric
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "cptstarz1004" cptstarz1004@ wrote:
> >
> > Hello all, I am looking for information to install an inboard electric motor on my sailboat that can generate 10 horsepower or compare to a 10 horsepower gas motor in torque and speed. Where can I buy batteries, motors, powertrains, and solar chargers?
> >
>
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