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[GMCnet] Battery boost switch [message #290729]

Sun, 22 November 2015 14:49

Advanced Concept Ener

Messages: 112
Registered: December 2014

Karma: 0

Senior Member

I really don't understand he chemistry of the "battery" exploding. I can understand that if you charge the battery too quickly you can generate a lot of hydrogen gas which will explode when the concentration reaches 5% even without a spark. If you get a shorted cell in one battery you can get fast. Discharge in the other which can also cause excess hydrogen. Seems like you always see circuit breakers recommended in the lines to parallel batteries that I assumed were to limit current flow and hence hydrogen generation. I really don't know that much about batteries however which is why I asked the question. Just seems if you isolate batteries and then close a switch to connect them the chances that one of them is fully discharged is high and high current flow between them is also high.

Jon Darcy ACES
North Jersey 76 stretch, flares, 4 bag, Alcoa's, bunkhouse,MAC Dash
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Re: [GMCnet] Battery boost switch [message #290730 is a reply to message #290729]

Sun, 22 November 2015 15:25

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Jon,

I don't mean to be a smart ass but I just Googled; "why do batteries explode" and got a page full of hits.

Regards,
Rob M.
The Pedantic Mechanic

-----Original Message-----
From: Advanced Concept Energy Solutions

I really don't understand he chemistry of the "battery" exploding. I can understand that if you charge the battery too quickly you
can generate a lot of hydrogen gas which will explode when the concentration reaches 5% even without a spark. If you get a shorted
cell in one battery you can get fast. Discharge in the other which can also cause excess hydrogen. Seems like you always see circuit
breakers recommended in the lines to parallel batteries that I assumed were to limit current flow and hence hydrogen generation. I
really don't know that much about batteries however which is why I asked the question. Just seems if you isolate batteries and then
close a switch to connect them the chances that one of them is fully discharged is high and high current flow between them is also
high.

Jon

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] Battery boost switch [message #290735 is a reply to message #290729]

Sun, 22 November 2015 16:07

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

Good new equaly sized batteries are "usually" ok in parallel, for a while. Has to do with impedance. If the impedance of one drops it presents a load to the other. Energy is dissipated as heat. That is one possible failure mode.

John Lebetski
Woodstock, IL
77 Eleganza II

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