[RE-wrenches] Battery based hydrogen incidents

[penobscotsolar at midmaine.com]

Hi Dana,
   In 22 years of installing off grid systems I have never seen or heard
of one, but then, we have always vented our battery based systems, even
the VRLA type batteries......

Daryl

Penobscot Solar Design



> Hi Dana,
>
> I've been 16 years all offgrid, no reports that I know of.
>
> jay
>
> peltz power
> On Dec 15, 2010, at 8:10 AM, Dana wrote:
>
>> Ken –
>>
>> To meet the flow have run 2 and 3 fans to meet the flow. 2” output from
>> the fan into a 4” header with a matching 2.5” inlet as far away on the
>> lowest portion of the battery box.
>>
>>
>> In 22+ years in off grid installations I have yet to see or even hear of
>> one hydrogen explosion. I get repeatedly asked why we have to go to the
>> efforts we go to for box and venting. I am not able to provide even one
>> incident that I have heard rumor of.
>>
>> Q - How many battery based hydrogen incidents have happened in our
>> collective experience?
>>
>>
>>
>> Dana Orzel
>> Great Solar Works, Inc
>> E - dana at solarwork.com
>> V - 970.626.5253
>> F - 970.626.4140
>> C - 970.209.4076
>> web - www.solarwork.com
>>
>> "Responsible Technologies for Responsible People since 1988"
>> Do not ever belive anything, but seriously trust through action.
>>
>> From: re-wrenches-bounces at lists.re-wrenches.org
>> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kent
>> Osterberg
>> Sent: Tuesday, December 14, 2010 12:07 PM
>> To: Wrenches
>> Subject: [RE-wrenches] Battery Venting
>>
>> Fellow Wrenches,
>>
>> The discussion about battery venting reminds me of a useful and
>> inexpensive program, BattMV, for determining ventilation requirements
>> per EN-50272.  EN-50272 is a European standard used to determine how
>> much air flow is needed for a room, I don't know of a equivalent
>> standard used in the U.S.  It takes a surprising amount of ventilation.
>> For a 400-AH 48-volt L16 bank charged at 57.6 volts and 24 amps, it's
>> about 7 CFM just to keep the %H2 down to 4%.  A 12-volt Zephyr vent is
>> good for about 5 CFM!   If you think you are venting enough, take some
>> time and study this issue.
>>
>> Kent Osterberg
>> Blue Mountain Solar
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