That's why we usually have the batteries in a garage, basement, or out building that is not open to the living space. I've seen some cases of very well sealed and insulated enclosures allowing batteries to over heat, and also build up a lot of acid damaged connections. Boxes I've seen with more air space and less sealing don't get this build up, but you're correct: they do occasionally allow H2S into the surrounding area.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 10/28/2014 8:10 PM, Jerry Shafer wrote:

We do what we can to seal the enclosure so if or when a battery fails and really gasses off the two vents on the same wall regardless of wind direction will vent the gas. If it is not sealed then the gas can travel through out the area this is not advised.



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