[RE-wrenches] Battery based hydrogen incidents

[Dave Palumbo]

Dana,

 

25 yrs experience. No incidents.

 

Dave

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dana
Sent: Wednesday, December 15, 2010 11:10 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
<http://pocketengineer.design.officelive.com/battery_ventilation.aspx> , 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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