Re: [electricboats] Electric Motor for 40' Sailboat

I installed an Electric Yacht Quiet Torque 10 KW motor for my Catalina 27. This would probably not be nearly big enough for your boat. 20 kW sounds like a better bet. It's also a 48 volt system. It's worked out great for local sailing with two 5 kilowatt hour LFP batteries in parallel. 

For cruising I'm going to add another 10 kWh of LFP batteries.

The one thing I would caution about going higher than 48 volts DC is that it's very difficult to find electrical components such as switches rated above 48 VDC at high current. Even finding 48 VDC switches is challenging. Many top out at 32 volts. 

I charge at the dock and have solar for backup. Theoretically it will regen when going over five knots under sail. Unfortunately I'm going to have to change the propeller to make that work. 

All the best,
David

   

On Mon, Jun 2, 2025, 2:55 PM Dale Shomette via groups.io <dashoway=gmail.com@groups.io> wrote:

I have researched electric motors for boats a number of years. MY choice for my 32' Buccaneer, which is still being restored, is the Electric Yacht  QuierTorque 20.0. It's 48 volts, 400amps current. Maximum power input is up to 20.0 KW, it will accommodate 3/4 to 1.5" shaft size, it weighs 135 lbs. It has two motors in tandem that you can cruise with one motor or both, depending on your speed and current and sea condition. 7.1 knots is my boats hull speed. 6.0 knots can be supported by a 11KW 48 volt gen set. At that speed, it takes 190 amps and 9120 watts. The motor will fit in where the engine would sites on the runners. The cost is about $9K. I think it is the most reliable on the market but that's just the opinion I've developed over the years. Good luck!

Dale

On Mon, Jun 2, 2025, 4:25 PM Kevin Pemberton via groups.io <pembertonkevin=gmail.com@groups.io> wrote:

You might want to visit sailing Uma.  It is a YouTube channel. They started with a golf cart motor.

On Monday, June 2, 2025, cammcnally10@outlook.com via groups.io <cammcnally10=outlook.com@groups.io> wrote:

Hi everyone,

 

I am restoring a C&C 40' sailboat on a budget, and I am planning on replacing the engine with an electric motor. I know some of the general specifications I would like, including Brushless DC, 48V, and 12 kW. Does anyone have experience or advice on repurposing motors from golf carts, forklifts, or other similar vehicles? I have briefly searched eBay and online motor catalogs.  

 

Any insight would be much appreciated.

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