Jeffrey,
I'll second Jay's suggestion that sealed AGM batteries are the best
choice in this circumstance. Presumably this is a grid backup system so
the poor endurance of AGMs for cycling applications shouldn't be an
issue. If you use a Zephyr power vent horizontal runs shouldn't be
problem, but what happens when the power vent fails? It will fail. I've
seen the bearings wear out on one and another that failed when insects
got into the blades and gummed it up to the point that the motor stalled.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 12/31/2011 6:59 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
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