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CD-ROM Aktief 1995 #3
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CDA3.iso
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survival
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battery.zip
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BATTERY.001
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1994-02-24
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2KB
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37 lines
Subj : volt ampifier
>>> Hello, I'm trying to run a answering maching off a solar fed
>>> 12v deep
>>> cycle battery. the answering machine requires at least 13v.
>> Thenm you shouldn't have a problem, since a fully charged
>> lead-acid
>> battery rated at "12 volts" should be putting out 13.2 volts
>> (2.2 volts * 6 cells = 13.2 volts).
> That is the voltage that a brand new and totally full battery
> will put out, correct? However, in the real world your battery
> voltage could esily drop to 12.2 volts when batteries are not
> full.
Just to put in my two cents, since I've lived for about 17 years "off grid"
before moving here 5 years ago -- anyway, any lead-acid battery that gets down
below 12.5 volts is probably junk. You can't let them go down without recharging
them almost immediately or sulfation occurs, and that's the end. Or at least,
the beginning of the end. Take a brand new lead-acid cell, especially one meant
for starting cars, not deep-cycle, crank it down to nothing, and you've cut the
life expectancy in half, at least. If you then let it sit even 12 hours totally
discharged, it's pretty much ruined.
So anyway, the unit should certainly work off a "12 volt" battery. In
fact, most electronic stuff can work at a little less, or a little more, than
the rated voltage. Motors, however, are more touchy. A little higher voltage is
okay, but trying to run a motor at much lower than what it was designed for is
definitely asking for trouble. I mean, like expecting a "12 volt" motor to crank
a load on 10 volts.
BTW, I have an old book on deep cycle batterys for light plants that
shows how to take the batterys apart, rid the cells of sulfation, etc. and
restore them. From about the 1920's, leather bound. Neat!