[RE-wrenches] Battery based hydrogen incidents

[Warren Lauzon]

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



--------------------------------------------------------------------------------
_______________________________________________
List sponsored by Home Power magazine

List Address: RE-wrenches at lists.re-wrenches.org

Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org

List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org

List rules & etiquette:
www.re-wrenches.org/etiquette.htm

Check out participant bios:
www.members.re-wrenches.org


Northern Arizona Wind & Sun - Electricity from the sun since 1979
--------------------------------------------------------------------
Online Solar Store
Free Solar Discussion Forum
--------------------------------------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20101215/2385b1b5/attachment-0003.html>