[RE-wrenches] Battery based hydrogen incidents

[Jonathan Hill]

Me neither, in 30 years!

Jonathan Hill, solar applications engineer
Sierra Solar Systems
563C Idaho Maryland Road
Grass Valley, CA 95945
Celebrating our 30th year in solar!
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On Dec 15, 2010, at 8:58 AM, jay peltz wrote:

> 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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