Drake, Please explain what might happen if something went wrong with one battery, and the
Phil Forest South Mountain Company > On Oct 31, 2014, at 8:42 AM, Drake <[email protected]> > wrote: > > One big advantage of not venting AGM batteries to the outside is that when > something goes wrong you will know it. A well vented system could have one > bad battery ruin the entire pack before the problem was detected. > > > At 08:12 AM 10/30/2014, you wrote: > >> To do it totally passive you will need a long (tall) pipe up the side of the >> building, probably painted a dark color to have the sun help warm the tube >> to help encourage it to vent up, not draw into the building. Put a 180 on >> the top to keep the rain out and a screen to keep out the bugs. >> >> With outside venting the batteries will just draw in room temperature air, >> if the room is 70 the battery min temp will be 70. If they are in a basement >> they will naturally draw in outside air, run the vent as high as you can to >> help prevent that. If you are using a Classic use the relay to turn the fan >> on and off at a specific battery voltage. Use a brushless fan and a voltage >> powered relay if no other choice. Do not put the relay in the battery box! >> Sealed batteries do need to be vented. I have seen them gas when things go >> wrong, not pleasant. >> >> I wouldn't do it without a fan for LA batteries but it would work for >> sealed. If the home has a makeup air system or huge exhaust system all bets >> are off. >> >> Just some thoughts, >> >> Bob Ellison >> >> -----Original Message----- >> From: RE-wrenches [mailto:[email protected]] On >> Behalf Of Drake >> Sent: Wednesday, October 29, 2014 8:19 PM >> To: RE-wrenches >> Subject: Re: [RE-wrenches] Passive Battery Venting >> >> Hi Daniel, >> >> I typically vent them the way you do, which will allow any small amount of >> hydrogen out. The customer is absolutely adamant about venting these to the >> outside. I will cooperate so long as his method doesn't compromise the >> system through cooling the batteries unnecessarily in the dead of winter. >> >> He is a lawyer and came to the conclusion of the need for venting to the >> outside from reading the NEC which says that sealed batteries "require the >> same amount of ventilation" as liquid lead acid batteries. The code also >> says to vent appropriate to battery technology, so the code says two >> conflicting things. On the other hand, it doesn't say that liquid >> electrolyte batteries need to be vented to the outside. They will sure stink >> if you vent them to the inside. >> >> Drake >> >> At 09:54 AM 10/29/2014, you wrote: >> >I just re-read the original post Drake. These are AGM batteries. Do you >> have >> >a "belt, suspenders,...then a rocket pack" type of client here? >> > >> >We typically vent our AGM boxes with small louver vents top and bottom to >> >allow the batteries to ventilate for cooling purposes, not H2 concerns. >> > >> >With Regards, >> > >> >Daniel Young, >> >NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90 >> >NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13 >> > >> >-----Original Message----- >> >From: RE-wrenches [mailto:[email protected]] On >> >Behalf Of Ray Walters >> >Sent: Tuesday, October 28, 2014 11:12 PM >> >To: RE-wrenches >> >Subject: Re: [RE-wrenches] Passive Battery Venting >> > >> >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. >> > > >> > > >> > >> >_______________________________________________ >> >List sponsored by Redwood Alliance >> > >> >List Address: [email protected] >> > >> >Change listserver email address & settings: >> >http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> > >> >List-Archive: >> >http://www.mail-archive.com/[email protected]/maillist.html >> > >> >List rules & etiquette: >> >www.re-wrenches.org/etiquette.htm >> > >> >Check out or update participant bios: >> >www.members.re-wrenches.org >> > >> > >> > >> >----- >> >No virus found in this message. >> >Checked by AVG - www.avg.com >> >Version: 2012.0.2247 / Virus Database: 4031/7973 - Release Date: 10/29/14 >> > >> >----- >> >No virus found in this message. >> >Checked by AVG - www.avg.com >> >Version: 2012.0.2247 / Virus Database: 4031/7973 - Release Date: 10/29/14 >> > >> >_______________________________________________ >> >List sponsored by Redwood Alliance >> > >> >List Address: [email protected] >> > >> >Change listserver email address & settings: >> >http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> > >> >List-Archive: >> >http://www.mail-archive.com/[email protected]/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: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/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: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
