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Re: Front lift and 12-volt batteries
- Subject: Re: Front lift and 12-volt batteries
- From: David Roden <roden ald net>
- Date: Tue, 29 Sep 1998 21:56:26 -0400
- In-reply-to: <firstname.lastname@example.org>
- References: <0EZZ008427RY16@PM03SM.PMM.MCI.NET>
- Sender: owner-elec-trak cosmos5 phy tufts edu
Folks, thanks again for all the generous support and advice. There were
several thoughtful responses, something to learn from each. Here's a
synopsis of what I heard, and what happened when I installed the batteries.
tonyascrizzi juno com (TONY B ASCRIZZI) wrote:
> Dave,the 12 volt batteries will work fine. As far as the lift, I have
> always run mine on 12 volts. I think 18 volts is too high.
Christopher <Christopher Meier MCI2000 com> wrote:
> I've been wondering this also. I'd guess that 12v would also make
> it try to draw more current to perform the task, and burn it out.
Larry <lelie ford com> wrote:
> Your idea should work fine but you are right in that the lift is too
wimpy at > 12 V. I have not tried one at 24 V, and am sure it would not
> continuous duty. For light duty, you might get away with it. Another
> thought; measure the current for typical lifting. Compute the
> resistance, and add a heavy voltage dropping resistor in series to the
lift to > bring the voltage under load back to 18 or say 21 volts (fully
> batteries are 6.5 to 7.0 V; I'm sure the lift was designed for 3
batteries of > 7 V each). I suspect you can get away with it.
Walt <dwfh voicenet com> wrote:
> Try looping the strap 2 times. That is to say, instead of only going
> down to
> the deck, have it loop back to the top of the pulley. this gives a
> advantage and causes the lifting action to go up and down slower.
After these notes, I decided to chance it at 12 volts. I figured that if
it turned out to be too wimpy, I'd take Larry's advice and add a series
resistor to the 24 volt tap. I'd also monitor the motor for possible
I found that the lift works a little slowly, but not intolerably so, at 12
volts. I suspect that when the pack charge begins to get flaky, it might
get to be a problem -- but it's time to stop working then anyway. I did
not note any funny smells from the lift motor area (just from the traction
motor speed resistors, which were working overtime until I wised up and
shifted to low).
BTW, I used the tractor a little over an hour tonight, and I didn't detect
any decline in performance. This is with six group 24 Deka Dominator gel
type deep cycle batteries, connected in series-parallel for 36 volts. They
are rated either 68 or 86 amp hours at the 20 hour rate (I forget which).
I am not using the onboard charger, but rather three external 12v automatic
shutoff chargers, one for each paralleled pair of 12v batteries. A little
more awkward to connect, but probably better for the Dominators than the
tractor's timer-shutoff charger. As valve regulated batteries, Dominators
can be damaged by too high a finish rate and/or too long a charge.
Millions of thanks to those who helped out with this question.
David Roden THE VIRTUAL PD roden ald net
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