I have an old Onan welder/genset/jumper unit that had a special relay on
the output so that it would interrupt the current flow if the current was
reversed (IE discharing into the generator) If you have a transformer
style DC welder, this is not possible due to the rectifiers on the output
of the welder.
I'd be very careful to get the polarity right and keep a voltmeter across
the batteries at all times. I wouldn't leave that setup unattended for
any period of time, since you could easily overcharge the batteries and
damage them. Note that charging batteries at high currents isn't ideal
also. But it might make a good jumping setup. About 29.5 -30 volts
should provide a good charge / jump current.
Be careful however as my DC welder has an open circuit voltage of about
70 VDC. That's a lot more than 30 !
Dave Cole
On Sun, 5 Sep 1999 19:59:06 -0700 "Henry" <henrya@jps.net> writes:
>Hi all,
>First, feel free to chuckle, or outright laugh at these things, I'm
>new and
>don't mind sharing my antics.
>Has any one ever tried jumping a dead 24V system from a DC 27V welder
>source? It seems that it should work, having up to 225 amps (mine, any
>way)
>available for starting. What amperage would a person set it at to try
>that,
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