More Exploding Batteries [RE-wrenches]

[Matt Tritt]

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Dear group,

This is something I got from the AWEA layman's list on small wind. Even though it shows an incredible level of naiivitee' on the part of the author, the explanation of how batteries can explode without warning is pretty interesting!

"Don't over-charge lead-acid cells, they can explode! (I) noticed the exploded cell after running battery charge from Diesel generator when the batteries were already fully charged from win/water turbines."  (can you believe this?)

"I am glad I wasn't in the battery room when it happened. The cell is still giving >2.0 volts so I presume the following occured (found on the web)
""The most probable cause of internal explosions are from a combination of low electrolyte levels below the plates in the battery and a low resistance bridge is formed between or across the top of the plates. This is called "treeing" between the positive and negative plates. When current flows in the battery, a spark occurs and ignites the residual gas in one or more of the cells.""

"I thought my battery bank was too large to worry about charge control." (My favorite part!)

Matt T

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