Re: Powerstat and transformer for variable voltage output
- From: Rich Grise <richgrise@xxxxxxxxxxx>
- Date: Wed, 08 Feb 2006 17:41:07 GMT
On Tue, 07 Feb 2006 10:16:42 -0800, tucker wrote:
Hello, I need to charge a alot of different voltage lead acid batterys
6,8,10,12, ect. I have a
old charger that only puts out 12-14vdc, I have a 10amp 120vac powerstat
(variac) im thinking
of adding to the input of the transformer to reduce output on the
secondary. Will this work?
Im not sure about the inductance & operating a transformer @ 1/2 or
2/3 the normal 120 vac
input voltage, im wandering if this will effect efficiency or if it will
work at all.
Probably not. Ordinary household battery chargers are designed to put out
a specific voltage. There's a possibility that your charger uses a
"ferroresonant" transformer, that's got regulation built in - what this
does is, when you decrease the input voltage, the input current actually
_increases_, so that it can still put out the rated output. BTDT - it's
weird watching the voltmeter and ammeter on the primary of a new ferro
xformer, and watching it draw, like, 7 amps when the input is at, like,
3 volts. ;-)
If your battery charger is just an ordinary linear transformer/rectifier,
then maybe, if you're very careful, have at least a voltmeter and ammeter,
and know what you're doing.
How hard is it to open the charger and see exactly what kind of circuit
we're dealing with?
Thanks,
Rich
.
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