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Battery question: Can this be done? - Page 2

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Posted by Roberto Deboni on August 17, 2010, 1:30 pm
 


Jim wrote:

You could hook each panel with one battery.
The downside is that you need two controllers.
The upside is that each battery is charged as needed.
The battery may stay connected in series, but each panel see's only his
battery.

Robert

Posted by Jim Wilkins on August 17, 2010, 11:25 pm
 



One of the panel connections isn't grounded any more and if you aren't
careful you can short circuit a battery while troubleshooting.

jsw

Posted by Roberto Deboni on August 18, 2010, 12:05 pm
 

Jim Wilkins wrote:

In a series connection one panel is never grounded ...


There are a lot of ways to short circuit a battery :-)

Robert

Posted by Jim Wilkins on August 18, 2010, 4:47 pm
 


There are, but floating power supplies are particularly bad if you
forget the "ground" side isn't while chasing a problem on the high
side. It's more a hazard with oscilloscopes than voltmeters.

The worst accident I've seen was when a tech near me grounded his
scope probe to an SCR trigger circuit that was misfiring. When he
turned the power on the scope probe ground shield exploded and burned
him badly. He was actually lucky, if he had cut the ground pin off the
plug the control panel would have been at 120VAC and he could have
been electrocuted across the chest.

I had to take over for him. I found a scope with a differential plugin
that subtracted out the AC voltage.

jsw

Posted by Josepi on August 19, 2010, 2:12 am
 

I had a few techs try to see how much current a 120Ah 130Vdc bank would put
out when they didn't understand the selector switch on a Beckmen digital
meter didn't switch the current jacks too.

Only some eyebrow burns and two probes burned right off. I had to fix the
damn thing, back in the mechanical switching years. New switch and away it
went, good as new. Good lesson for a couple of electricians trying to be
technologists.



There are, but floating power supplies are particularly bad if you
forget the "ground" side isn't while chasing a problem on the high
side. It's more a hazard with oscilloscopes than voltmeters.

The worst accident I've seen was when a tech near me grounded his
scope probe to an SCR trigger circuit that was misfiring. When he
turned the power on the scope probe ground shield exploded and burned
him badly. He was actually lucky, if he had cut the ground pin off the
plug the control panel would have been at 120VAC and he could have
been electrocuted across the chest.

I had to take over for him. I found a scope with a differential plugin
that subtracted out the AC voltage.

jsw



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