[RE-wrenches] Passive Battery Venting

jay peltz jay at asis.com
Thu Oct 30 07:36:25 PDT 2014


Hi drake,

I think you need to charge him so you can actually calculate/design the max H2 for any condition and size the vent system for that. 

And lawyer = conduit

Jay
Peltz power. 




> On Oct 29, 2014, at 5:19 PM, Drake <drake.chamberlin at redwoodalliance.org> wrote:
> 
> 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-bounces at 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.
>> >
>> >
>> 
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