Ralph, I think Eric Lemmon has explained it very well...but I work for a large telecommunications company here in Canada and we put AGM / VRLA batteries in equipment cabinets all the time and never had a problem. They are mounted on a steel shelf with a rubber mat below them.
We do use very high quality charging equipment and regularly monitor the internal Impedance of the batteries. 73 John VE3AMZ ----- Original Message ----- From: Ralph S. Turk To: Repeater-Builder@yahoogroups.com Sent: Saturday, August 07, 2010 5:20 PM Subject: Re: [Repeater-Builder] AGM Batteries I would NEVER put any electronics in the battery enclosure. All batteries are known to vent some vapor. Even very little acid or basic vapor will ruin the electronics Been there, have the ruined controller to prove it. Ralph, W7HSG ----- Original Message ----- From: "tahrens301" <tahr...@swtexas.net> To: Repeater-Builder@yahoogroups.com Sent: Saturday, August 7, 2010 2:05:09 PM Subject: [Repeater-Builder] AGM Batteries Hi Folks, I got a couple of the large AGM batteries for a solar installation, and was wondering if there is any condition that will lead them to vent inside the enclosure? They are sealed, but probably have one-way valves. Can I put the solar controller in the same enclosure? Figured some of you folks have done solar stuff before. Thanks, Tim