Don,
Congratulations on your successful conversion. Sounds like a great
start. You mentioned that you may limit your max amp output to 50 amps.
I say keep it like it is. I find that a quick burst of power is often
exactly what you need for many common sailing situations: setting an
anchor, a quick docking maneuver, getting off when you run aground,
avoiding a collision with a bouy, dock, or other boat (quick
reversing). I have called upon my motor in all of these situations, and
needed every bit of 130amps at 48 volts, and sometimes I wish I had
more. It is often suggested that "bollard pull" is irrelevant to
electric boating; most of what is discussed is cruising at or near hull
speed, but don't forget these other real world situations. Often a 5 or
10 second burst of power is all you need. You don't have to run at 90
amps all the time.
Fair winds,
Hans
--- On Tue, 10/13/09, postal6@juno.
From: postal6@juno.
Subject: Re: [Electric Boats] Re: Testing A Mars ME0709 Electric Motor
To: electricboats@
Date: Tuesday, October 13, 2009, 10:41 PM
At the end of the day after testing, my monitor said I had 43 percent
battery left. I put them all back on my four bank charger and brought
them back up. I plan on setting my throttle switch to a maximum of 50
amps, thereby avoiding discharging the batteries below 50 percent. When
I tested the motor at 91 amps at a speed of 6 knots, even for the short
period of time, the drain on the batteries was monumental.
Don Swanson
[Non-text portions of this message have been removed]
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