[RE-wrenches] Battery based hydrogen incidents

[Darryl Thayer]

Yes they happen, Robb Cary of Battery Testing Co. has some frightening photos.  I have lost contact with him however.  I have had an experiance, but I did not take pictures.  When you find the top of the battery and or battery enclousure blowen to smitherens it was a hydrogen explosion.  Sorry I am on road today, would love to comment more.  maybe later
Darryl

--- On Wed, 12/15/10, Warren Lauzon <warren at wind-sun.com> wrote:


From: Warren Lauzon <warren at wind-sun.com>
Subject: Re: [RE-wrenches] Battery based hydrogen incidents
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Date: Wednesday, December 15, 2010, 11:05 AM







In the 30+ years that we have been in the solar business, we have never seen or even heard of a single one.
 


 

From: Dana 
Sent: Wednesday, December 15, 2010 9:10 AM
To: 'RE-wrenches' 
Subject: [RE-wrenches] Battery based hydrogen incidents
 


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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