I do agree steel and copper/brass is to expensive for the possible return. On Oct 28, 2014 4:10 PM, "Jerry Shafer" <jerrysgarag...@gmail.com> 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. > On Oct 28, 2014 4:06 PM, "Ray Walters" <r...@solarray.com> wrote: > >> That's an interesting idea, but all the failed designs they illustrate >> don't show the way we usually do it. We don't even bother with an inlet, >> as most battery boxes have enough gap around the door to provide intake >> air, then the exhaust comes off the top with several feet of rise to >> prevent back drafting. If its in any space that H2s may be a problem >> (living space), we always add a Zephyr Power vent which has a back draft >> preventer. Even if the Zephyr fails, there will still be passive air flow >> up the pipe past the fan. >> I see 4 problems with their setup: >> 1) Large Copper pipe is really expensive, and steel is hard to work with >> and fittings are expensive. >> 2) Metal pipe is not only thermally conductive, its also electrically >> conductive. I try to avoid unnecessary conductors in the battery box. >> 3) Metal pipe will corrode when exposed to H2S and battery acid. That's >> why we always use plastic. >> 4) Their suggested pipe size (1" outside pipe) are way too small to >> provide venting for any more than a couple of golf cart batteries. >> >> Basically, heat exchanger = good idea, but their version = not. >> >> As for the battery pass through connectors: they seem to be adding >> unnecessary connections, and would also prevent using conduit. I'd guess >> they're not UL listed, so that whole idea is also code compliant. Duct >> seal will prevent the H2S from going up the conduit into the DC load center. >> >> They're trying to seal the box too much; the only time you could actually >> have an explosive build up of H2S is if you sealed every gap on the battery >> box. I think its easier and safer to keep the gaps, and if your venting >> fails, at least it won't blow up or over heat. >> >> R.Ray Walters >> CTO, Solarray, Inc >> Nabcep Certified PV Installer, >> Licensed Master Electrician >> Solar Design Engineer303 505-8760 >> >> On 10/28/2014 4:28 PM, Drake wrote: >> >> Hello Wrenches, >> >> A client wants to use a passive battery venting method with a heat >> exchanger to the outside for his bank of Full River AGM batteries. Below is >> a link to one site that recommends this method. Has anyone used this >> method? >> >> http://www.bdbatteries.com/hydrogenventing.php >> >> My main concern for about the batteries is that they not get cold and >> lose capacity during the short days when storage is most needed. >> >> He would also like to connect the terminals inside the box to a pass >> through jumper http://www.bdbatteries.com/lugs.php?id=269 and then run >> the cables, without conduit, to the inverter. As far as I know, conduit is >> always required on the battery cables even if fuses are used in the battery >> box. Has anything changed? >> >> Thanks, >> >> Drake >> >> Drake Chamberlin >> >> >> >> >> >> *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified >> Solar PV 740-448-7328 <740-448-7328> *http://athens-electric.com/ >> >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & >> settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette:www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios:www.members.re-wrenches.org >> >> >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> >>
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