[RE-wrenches] Battery based hydrogen incidents

[Dana]

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_ventila
tion.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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