[RE-wrenches] Solar vent for flat roof

[Dana]

Kent - 

 

Is your solar vent fan rated for the potential of explosive gasses and will
the solar fan be working at full charge when the backup generator is running
[if you have one]? 

 

I have used 2 of the Zephyr fans on 2,000 ahr at 48 VDC battery banks and
they are rated for the gasses,  and gotten great results.

 

 

Dana Orzel

 

Great Solar Works, Inc

www.solarwork.com

E - dana at solarwork.com

V - 970.626.5253

F - 970.626.4140

C - 970.209.4076

"I'd put my money on solar energy. I hope we don't have to wait 'til oil and
coal run out before we tackle that."

-Thomas Edison, in conversation with Henry Ford and Harvey Firestone, March
1931

 

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Kent
Osterberg
Sent: Wednesday, April 08, 2009 1:59 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Solar vent for flat roof

 

Allan,

I recently studied this battery room venting issue when an inspector
challenged me to show that a Zephyr vent was adequate to vent a room with a
48-volt 1700-amphour battery bank.   I ended up finding that to keep the
hydrogen concentration down to 1% (1/4 the explosive limit) required 75 CFM.
The Zephyr vent at 5 CFM wasn't anywhere near sufficient; we ended up
putting in a 100 CFM vent fan that is activated when the battery voltage
exceeds 2.4 volts/cell.

Using a solar vent fan is probably a good solution as long as the only
charging source is solar.  If there are any other charging sources, a solar
vent fan wouldn't be adequate. 

Kent Osterberg
Blue Mountain Solar

 

Allan Sindelar wrote: 

We have twice used pairs of Zephyr Power Vents to successfully vent large
banks, up to around 2200A/hr @48V. A 12V unit exits roof or wall with a 2"
pvc stack; 48V is 3"; thus they flash just like standard plumbing vents.
 
Note that the charge rate is more important than battery capacity, as it
determines the amount of gassing that must be exhausted.
 
Allan at Positive Energy
 
-----Original Message-----
 
Wrenches,
Our client has 48 IBE 85N-15 batteries in a room with a flat roof. What is 
your recommendation for a solar powered vent that works well and flashes 
well so that it does not leak? Thanks in advance for your advice.
Joel Davidson 
 
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