T-Pain Is On A Boat: RE: [Electric Boats] running the motor on genset

Sunday, December 28, 2014

RE: [Electric Boats] running the motor on genset

Hi Steve,

Interesting article,but what still puzzles me is how you can run your two engines only on generator when you have 24 hp of motors (around 17kw) and your generator is 16kw, wich is a little less. Are DC motors different than AC motors wich I know need much more power to start than their own HP.

Martin,

Happy holidays you too.

To: electricboats@yahoogroups.com
From: electricboats@yahoogroups.com
Date: Fri, 26 Dec 2014 06:30:56 -0500
Subject: RE: [Electric Boats] running the motor on genset

Hi Martin,

I've attached an article on the first of 3 410 S2 E electrics produced with the Solomons system. The original diesels where rated at around 27HP each side.

http://www.multihull-maven.com/Electric_Lagoons

Waypoint has several articles out there so do a search if you want to see some other comments. Even at 8 knots I still have some throttle left so in rough weather I can push harder. The output of the genset limits me to around 80A.

Happy Holidays,

Steve in Solomons MD

410 S2 E

From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Sent: Thursday, December 25, 2014 10:19 AM
To: electricboats@yahoogroups.com
Subject: RE: [Electric Boats] running the motor on genset

Steve,

What size diesel engine(or engines) your two 12hp electric motors replace?

you say that you do hull speed with your genset but what about in rough weather?

Martin

To: electricboats@yahoogroups.com
From: electricboats@yahoogroups.com
Date: Tue, 16 Dec 2014 07:08:55 -0500
Subject: RE: [Electric Boats] running the motor on genset

Martin,

I have a 41 foot Cat with the Solomons Tech system, Twin ST74 motors putting out 12HP(24HP) on each side. I also have a 16 KW Genset that meets the needs to get to hull speed, around 8 knots. With a variable speed output on the genset I charge the batteries then any excess power is sent to the motors. Now here's the kicker. I run at 144V DC which means I only need around 80A to run at hull speed so the 16KW genset meets the needs of the motors. By setting the genset output to anywhere from 144V to 164V DC I can safely charge the batteries then run the motors with the genset since the amperage is reduced to the batteries. I can run all day on genset only if I had to.

So to answer your question yes you can but Genset size would depend on your voltage output (amps) of the genset and the motor requirements. This sounds like you're looking at a mono boat in the 40 ft range?

Steve in Solomons MD

Lagoon 410 S2E

did someone run his motor only on generator power without any batteries? was this discussed before? would it need a too big generator ? I was thinking of a 15 hp motor driven by a 25kw generator?
any opinions?

Thanks, Martin