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I think we are on to something. I have a two explosion-proof reps coming in. We'll put the battery in there, and the rest of the items in the purged/pressurized enclosure. Of course, in all reality the probability of violent battery failure is rare, we just want to play it on the extra safe side...

Alehman - correct we have considered AGM and GEL VRLA batteries. Due to the rigorous cycling of the battery - to be discharged fully several times daily, we have determined that we'll probably get more out of a GEL. Thanks again to everyone for their responses. I've read code over and over and...

The system is pressurized, so air from the mobile tank inside is at a premium, and the operation of the pressurized system would be compromised. Does that make sense?

Stevenal - that all sounds pricey - still, I'm pursuing it to see what the deal is. These systems typcially run $30K, so hiding $1K worth of stuff in it probably not too much of a problem. Old Dave - thanks for the tip - I'm checking them out now. I like the simplicity of the explosion-proof...

Those guys sound perfect for your application. I saved their web site in my Favorites if I ever need them! I work with a company that does ergonomic plant floor solutions - almost all of our stuff has to be NEMA4X, Stainless Steel, and we do some hazardous stuff too, so the scanners we use are...

Thanks Old Dave! Yeah, I'm researching NiCad as well as an option, I've even entertained some sort of NiCad UPS. We need to power 80-100 watts worth of stuff for 4-5 hours at a time. The standard VRLA or Gel we'd consider are the 70/80 amp hour batteries so I'm challenged to find the equivalent...

I like to refer to the purged environment as sealed since we'll only be operating the purge at the minimum pressure (we have an on-board air tank) and I have concerns about the true air movement and replacement, especially if there were a large release of H2 due to some failure of the battery...

Thanks for the quick response! Our concern is exceeding the mere requirements of the reg to put a perfect system together. I think GEL is the way to go vs. VRLA. I just worry that the charger could malfunction and in an overcharging situation, I'm not sure if I should be monitoring H levels...

Does anyone have any background with using VRLA or GEL style 12V batteries in a Class I Div I area? This NEMA 4x sealed mobile system is protected with a Y Purge and a non-incendive enclosure and contents and has its own mobile pressurized air supply. but I can't get a straight answer out of any...

Does anyone have any background with using VRLA or GEL style 12V batteries in a Class I Div I area? This NEMA 4x sealed mobile system is protected with a Y Purge and a non-incendive enclosure and contents and has its own mobile pressurized air supply. but I can't get a straight answer out of any...

What is harsh? hot? sticky? hazardous? We have a few different vendors we call on for various degrees of difficulty....