[RE-wrenches] battery venting; Corrosion

[Larry Crutcher, Starlight Solar Power Systems]

Hi John,

I am curious about what you saying "float or equalization". Here's my understanding: If the battery is able to accept all current presented, the electrochemical process, SO4 combining with H released through decomposition, is balanced and with little excess gas released. When the electrolyte becomes saturated there is no more SO4 to recombine and gassing is raised significantly, the volume increasing relative to voltage.  Thus, equalization charging produces the highest volume of H and O gas. However, when the voltage is lowered to float, the current is at the lowest state, about 0.2 amps/100ah capacity, decomposition at that point is practically nil.

Am I missing something or did you mean to say during the acceptance and equalization mode?

Larry Crutcher
Starlight Solar Power Systems


On Jan 6, 2012, at 9:00 AM, John DeBoever wrote:

Kent,
 
Thank you for pointing at the units. Please note that:
·         You are looking for cc/hr/Ah/cell rates at float and equalization voltages.
·         Gassing is a function of charging current (FLA: an ampere-hour of overcharge, i.e. during float or equalization mode, results in about 0.33 cc of H2O total gassing per cell)
·         For constant voltage (float or equalization) the current is a function of temperature and stage of battery life (plus any failure modes that begin to occur toward end-of-life)
 
I’ll work up a response after a series of meetings.
 
John
 


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