# 12 volt power source?

On Sat, 22 Dec 2007 14:38:11 +1300, I said, "Pick a card, any card"

Lead-acid batteries require a minimum of 10% over nominal. That's why 13.8 volts is used to charge a 12 volt lead-acid battery. Applying any less will cause a drain after a very short time. When a battery goes way down, say to 10 volts or so from use, a 12 volt power supply will work up to a point and then become a drain on the battery. At 10% over battery rating, that's 12.0 volts plus 1.2 volts or a minimum of 13.2 volts to sustain a charge and then a trickle. Obviously, 13.8 volts fits that requirement. A unique thing about a lead-acid cell is that you really can't overcharge it unless you are dumb enough to use a constant current charger. The battery presents a smaller and smaller load to the charger as it gets more fully charged. Nature of the beast. -- Ray
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Greg Procter wrote:

Sounds about right!!! A "NORMAL" 'Train Power Supply', will charge an attached 'capacitor' to close to 20 volts, because of the peaks in voltage available for a very small amount of time.
Chuck D.
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On Thu, 20 Dec 2007 17:49:49 -0500, David Starr

I found 12 volts too fast for tortoises so I got an el cheapo train set throttle for a song at a train show - use the throttle to set what seems a good speed and forget it.
These are cheap and can be used for lots of things like layout lighting, signals, crossing gates etc. Anything where you don't need a traction-quality supply.
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Carter Braxton wrote:

Carter,
Stevert
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Yes, I'm glad I asked... if only to read the energetic exchanges between the group's readers... Thanks to all but especially to David Star who cut straight to my actual question and tells me that using a 16 volt power supply shouldn't hurt a Tortoise motor.
Carter

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Man have you asked the wrong group hehehe...
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On Sat, 22 Dec 2007 00:42:35 GMT, I said, "Pick a card, any card"

Clear your mind. That was easy. No thoughts. -- Ray
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Carter

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hehehe... right you are!
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