You would smell it. Miller Solar
> On Oct 31, 2014, at 1:20 PM, Phil Forest <pfor...@southmountain.com> wrote: > > Drake, > Please explain what might happen if something went wrong with one battery, > when they are not vented to outside. How would we know it? Thank you. > > Phil Forest > South Mountain Company > >> On Oct 31, 2014, at 8:42 AM, Drake <drake.chamber...@redwoodalliance.org> >> 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:re-wrenches-boun...@lists.re-wrenches.org] 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:re-wrenches-boun...@lists.re-wrenches.org] 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: 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 >>>> >>>> >>>> >>>> ----- >>>> 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: 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 >>> >>> >>> _______________________________________________ >>> 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 > > _______________________________________________ > 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
