48 Volt Power Vent For
2" PVC Pipe in 3" Out
venting is not just a good idea, but also required in order to
follow the guidelines set by the National Electric Code (NEC) in North America.
Hydrogen gas, which is what most batteries expel, is nasty business and highly
toxic. Most installations will require either a passive form of venting, or
will require a small inline vent fan such as this one. We here at Solar Biz have been using the Zephyr
Battery Box vent fans for years and so have our customers! These are required
for use with almost all battery technologies including wet celled, absorbed
glass mat (AGM), and GEL.
venting of hydrogen gas.
the smell outside.
batteries warmer in cold climates.
the battery tops and terminals cleaner.
very little power.
POWER VENT was designed for use in remote home power systems. The
concept arose from field experience of systems with enclosed battery boxes.
Quite often the NEC required venting was found back drafting, thus cooling the
battery bank and lowering its capacity as well as venting hydrogen gas into the
POWER VENT alleviates this condition by keeping a gravity operated
damper closed within the vent pipe except at times when the batteries are being
charged and producing hydrogen gas. During these times the battery box is force
vented with a low power, spark-less fan which overcomes the damper sending the
gas outdoors. The “fan on” mode is determined by the battery voltage. When the
batteries are “gassing” during charge periods the battery voltage will read above
normal. A voltage sensitive switch is required in the system to make the on/off
determination. Some inverters and charge controllers have a programmable
auxiliary relay which can control the POWER VENT. Other systems may require the
addition of a voltage controlled switch or relay.
POWER VENT is designed around typical home power systems with battery
banks under 2,200 Amp/Hours and charge rates under 150 DC amperes. Systems
larger than this can produce more hydrogen gas than the expel rate of the POWER
VENT which operates in the 5 to 8 cubic foot per minute range. Two vents may be
used for higher volume.
Hydrogen will set off a carbon monoxide detector. The Power
Vent has been successfully used to prevent nuisance tripping of this sort when
there is a carbon monoxide detector near the battery box.
Power Vents have also been used for other applications
where low power ventilation is required. These include methane gas extraction
from landfills, sewage sump tanks, outhouses, modest crawl space ventilation,
beer tap line cooling and more.
questions about Battery Venting? Call us Toll Free 888-826-0939.