Sunday, January 4, 2015

Re: [Electric Boats] Re: running the motor on genset

 

Thanks for the charger info. john, that was about my last problem !!  I just looked at my 48 volt charger, and found I could match it with a Harbor freight generator.  just enough to run a 15 amp 48 volt pack charge set up.  Weight is less than a battery set, and my current pack will run all day without the charger running.   One tank of gas, let it run out overnight and the pack is redone, no fuss, no extra fuel except in one tank filler packs, for day time genset running.   That's it, I'm ready for spring now, new battery pack, a few commercial accounts buy my batteries -- to pay for my hobby, I think I'm good to go. 
 
Till I get another bug of course, Finally have a three EV boat fleet, 18' outboard conversion power, 12' sail aux. (ply lap) with a motor well, and an 11 ft. kayak type, motor under the deck, with no obvious electric showing.  still have the complete Golden Motor extra 48 v. unit, with the latest controller, maybe a project for that will crop up.  Kicking around a couple things, maybe a dune rail sorta thing, got enough boats, a portable MIG welder and more Minn Kota motors left over.
 
Keep up the good work, ----   Cal                    
 
Sent: Saturday, January 03, 2015 9:10 PM
Subject: [Electric Boats] Re: running the motor on genset
 
 

Larry,

That sounds like it would have been a Ward Leonard system where the generator armature and motor armature are wired in a loop, resistance control of generator and motor fields controlling the speed.  Similar to elevators of that vintage but the elevator system used an AC line motor to drive the DC generator.  Pretty clunky control system by today's standards.

I suppose you could run a DC motor in a boat in some sort of similar fashion but find it hard to think of a good way of varying the generator output directly to control the motor, especially smooth acceleration and response to load changes.

Electronic controls for DC motors are exceptionally good these days but they expect to have a constant voltage that is capable of large rapid swings in current.  Batteries are very good at that!! 

I've not gotten there yet, still building my system (DC motor, batteries and a generator), but I don't think you would need a very large battery bank to provide the rapid current response along with a good size generator to keep them full.  The batteries should last a long time as they would never be discharged very much.

John



 

--
Flatwater Electronics
www.flatwaterfarm.com
"Neurosurgery for computer looms."

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Posted by: "cal" <h20dragon@centurytel.net>
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