according to this chart ;http://www.rel.com.au/media/tech-info/guide-to-choosing-generator-to-motor-size/
you need avery big genset to run a given size elec. motor (without the batteries)
Martin
To: electricboats@yahoogroups.com
From: electricboats@yahoogroups.com
Date: Tue, 16 Dec 2014 08:01:45 -0800
Subject: [Electric Boats] RE: running the motor on genset
While my system is not up and running yet, and moderate in size, 5 kw motor 48V 100 Ah & 2000# boat, I have decided on a small genset based on an alternator. Control of the alternator output and efficiency were the deciding factor. Like others the genset is only run when extended run time needed.
John
To: electricboats@yahoogroups.com
From: electricboats@yahoogroups.com
Date: Tue, 16 Dec 2014 08:01:45 -0800
Subject: [Electric Boats] RE: running the motor on genset
I would think you would want some battery in the system to act as a buffer to changes in load. Even a moderate battery has a large capacitance, on the order of 1 farad.
Of course it does depend on the type/size of generator and it's ability to respond to changes in load. __._,_.___
Posted by: mountain man <mdemers2005@hotmail.com>
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