[RE-wrenches] Battery based hydrogen incidents

[jay peltz]

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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