I am doing this project in India. The cost structures here are a great deal
more constrained that what we're used to. Using AGM batteries is going to be a
deal-breaker with the client as far as cost.
I also don't know if I can persuade the client to ship anything additional from
the US. We pay more for electrical stuff, and then shipping adds quite a bit
more on top. I've sold them on the idea of an Outback GTFX inverter on the
basis of its functionality in a backup setup, but, for instance, I'm having a
hard time convincing them that an E-Panel and a listed combiner box are a good
idea, rather than just cobbling the BOS enclosures together from locally
available breakers and PVC j-boxes. I also may end going with a indian-made PWM
CC rather than a FM60. The quality of electrical work here is abysmal. I'm not
sure if I can successfully make an argument on the grounds of somewhat
contingent safety concerns, or even less on engineering standards.
So I'm wondering: are there parameters that constrain the bending of a venting
pipe and the maximum angle from plumb that the pipe should take? And does the
pipe diameter play a role in those parameters?
Jeffrey Quackenbush
NABCEP Certified PV Installer
Peripatetic Solar Technician
________________________________
From: Allan Sindelar <[email protected]>
To: [email protected]
Sent: Saturday, December 31, 2011 8:42 PM
Subject: Re: [RE-wrenches] battery venting
Jeff,
I would use a Power Vent by Zephyr Industries. In addition to a 12V
or 48V fan, his units have a built-in backdraft damper. Negative
building pressure under certain conditions would be a concern of
mine, so I wouldn't rely on angle to ensure exhaust always travels
up and out.
Allan
Allan Sindelar
[email protected]
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Positive Energy, Inc.
3201 Calle Marie
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com
On 12/31/2011 7:59 AM, JRQ wrote:
Wrenches,
>
>
>I'm looking at a potential battery backup system wtih a 200 AH @48V flooded
>battery bank in the basement electrical room of a 3 story building. There is a
>window in the electrical room. The batteries will be located about 10' from an
>outdoor wall. The building is all reinforced concrete, so I can not run a vent
>pipe vertically from the batteries. Does anyone have a rule of thumb for how
>much the vent pipes can be angled from the batteries? Would it be more lenient
>for short sections of pipe (say <2') versus one long angled piece from the
>batteries? My instinct would be to keep the pipe no more than 45˚ from plumb.
>
>
>Or with bending the vent pipe: does anyone have a best-practice rule for the
>sum of the angles of bends?
>
>
>Thanks,
>Jeffrey Quackenbush
>NABCEP Certified PV Installer
>Peripatetic Solar Technician
>
>
>
>________________________________
> From: Drake <[email protected]>
>To: [email protected]
>Sent: Saturday, December 31, 2011 8:08 PM
>Subject: [RE-wrenches] Pole Mount PVC
>
>
>Hello Wrenches,
>
>With pole mount systems, It looks cleaner and is safer
to run the PVC
conduit down the pole into the concrete, and use a 90
degree elbow to
come out through the side of the anchor underground.
This way, the
pipe is protected from mechanical damage, and there is
nothing to trip
over when adjusting the array for seasonal tilt.
>
>I was told that some building departments will not allow
this. Has
anyone had a problem with using this method, either
technical or
legal? How do you like to route your conduits?
>
>Thank you,
>
>Drake
>
>Drake Chamberlin
>ATHENS ELECTRIC LLC
>OH License
44810
>CO license 3773
>NABCEP Certified PV
>
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