T-Pain Is On A Boat: Re: [Electric Boats] Re: Project lagoon 410

Friday, June 8, 2018

Re: [Electric Boats] Re: Project lagoon 410

Hi Pascal

I have a 45' electric sailboat. I did the conversion. I do not regret. Throw overboard those two alcoholic, stinky, smoky crews maned Diesel … They are from another millennium.

Beware… they will try to come back onboard by all means or as avatar called technician or mechanical engineer. Be without mercy…. feed the sharks.

For your cat, I will guess the 2 x 5kw motors could be enough, but it does not cost much more to get 2 x 10kw. I have 1 x AC20 HPEVs rated 7hp only, and it is more powerful than a 25hp diesel.

2 x 50 amps lithium batteries are fine, they are only 25kg each. you can always add more with the time if you need. They are easy to fix. Don't bother with lead batteries, it does not worth it ( I have 2 x 50 amps…a backup battery is useful). 48v is fine, it is safe and common. For the charger, I will recommend an IP rating.

A small generator gives more confidence for sailing and more comfort to live onboard.

About regeneration under sail, I don't get any. When I switch on the electric motor, the shaft slows down from 200 RPM to 30 RPM !. With your cat, you may get a trickle from 8-10 knots sailing speed.

Oceanvolt and others have electric sail drives… I don't know the price. It will be a big boatbuilder job to fix new propeller shafts, shaft bearings and build up a 10mm steel structure to receive the new electric motors ... Otherwise, find your electric motor, get the right gearhead with a compatible face and the proper reduction matching your propeller. There are so many gearheads from agriculture machine to IT robotic, google to find yours. The tricky point may be the coupling between the existing sail drive leg and the gearhead output. With a little of laser cut and DIY, you will get your way

Two improvements from my conversion would be:

-Regeneration at common and comfortable cruising sailing speed.

-Wireless controller for the electric motor in marina, anchoring, sail handling…

Don't use any German product if you don't want to speak German, if you don't want an Hitlerian cross on your boat or if you want to use your boat.

I hope those few words will help. Have fun. Good luck

On Thursday, June 7, 2018, 4:56:08 AM GMT+12, mike@electricyachtssocal.com [electricboats] <electricboats@yahoogroups.com> wrote:

I believe that the Lagoon 410 has Yanmar saildrives. My recommendation would be to replace both the motor and saildrive as the most prudent way to go. Yanmar saildrives from that era are known to have issues. You would be well served with two 20kW electric motors to replace the 35-40hp diesels originally installed by the builder. They would also be well matched with a single 10 to 15kW generator that would provide range extension, reduce battery weight, and support reasonable cruising speed.

I am not fully up to date on all saildrive options, but would think you should look at these vendors: Electric Yacht, OceanVolt, and Torqeedo for marine grade systems. There may be others that I am not aware of.

Mike

Electric Yacht Pacific

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Posted by: Berlouin Fred <berlouin@yahoo.com>

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