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Old 09-14-2021, 10:08 AM   #1
Junior Member
Join Date: Feb 2018
Posts: 3
Need for LiFePO4 venting?

Hello, newb here. My SMB build called for the large, ReLION 300AH underbench battery. To my surprise, they installed an outside vent for this compartment, which besides the lithium ion battery, also contains the 2800W pure sine inverter, Victron 35A MPPT solar charge controller and 712 shunt, plus the heavy wiring from solar. I'm thinking that having this compartment vented to the outside might not be good for the battery in below-zero temps. Was this vent installation a carryover habit from the AGM battery days and unnecessary, or might it be helpful because of the heat produced by these other components? I'm debating just stuffing the outside exit with insulation... Many thanks in advance.

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Old 09-14-2021, 03:07 PM   #2
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Join Date: Mar 2015
Location: Annapolis, Maryland
Posts: 2,300
Cant help with the reasoning behind your outside vent install, but I have a 2006 with the gaucho bench located just behind the drivers seat - all my electronics are stored inside that bench cabinet along with my water tank & pump. I do not have any outside venting, and batteries are located underneath the Van. But, I'll attest to the fact it gets very warm under there, more so when plugged into shore power.,,enough heat generated that it concerned me.
I simply installed seven of these across the top of the cabinet front of the gaucho, and two more on the sides. Used a hole saw to drill the holes (1" from the top) and just pushed the plastic vent covers into the holes (fit nice & snug). I already have two larger air vents located on the lower part of that gaucho cabinet, so the air circulates nicely.

Unless someone else can reveal a good reason to have the vent, I'd also plug it (especially in the winter).
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lifepo4, lithium ion, venting

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