[PSUBS-MAILIST] battery compensation

[Alan James via Personal_Submersibles]

Hank,the main advantage with AGMs is they don't spill.I did try to compensate my batteries with overpressurefrom a bike inner tube that I pumped up. It failed.I think it didn't like the compensating oil & was dissolvinga bit, & leaking.If you look up the instructions on the "Sea Battery" I thinkthey do what you are suggesting. I know they bleed offexcess gas from a valve in the diaphragm.Alan 

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, November 24, 2016 2:11 PM
 Subject: [PSUBS-MAILIST] battery compensation
   
Alan,I have figured out a way to use AGM batteries with oil compensation and NO need for 2psi relief valves.  The rubber bladder on top can act as a pressure source.  Just size the membrane to create tension by over filling with oil.  Might work, but I am not sure what the benefit would be by using AGM's -they are actually heavier than lead acid.Hank
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