I've made boxes in steel, then coating the entire inside with a rubber coating. Some of the benefits of keeping batteries inside of a conditioned space (relatively conditioned as compared to completely outside of the thermal mass) is that it tends to help their performance/longevity. Gasses are released from the batteries during charging, so that is a safety precaution I take just because it makes me feel all warm and fuzzy. When I want to water the batteries, I turn off anything charging them for a good 1/2 hour prior to popping the top. So I did not follow the positive pressure option. Also there is the risk the fan could fail which would defeat the entire vent system. I have considered adding a computer fan to positively pressurize them, but have not found the need. Those are more prone to leaking than an AGM, and I have had no issues. I've used standard wet batteries inside sealed containers that had dedicated vents to the outside of the vehicle. What concerns should I have and what design features should I include? I know that batteries can vent hydrogen, so I am curious why some campers are ok venting to he inside. I have seen many camper designs and layouts with the batteries inside and there does not appear to be any significant venting to the outside or any seal to the inside. Looking at around 800AH total plus starter batteries. My plan right now is to use AGM batteries unless LIon are cheap enough when the time comes. I will also have a drain plug in case I get a water in there. The floor will have hatches that are hinged up and I plan to have a in floor hydronic heating in the hatch. I will have a tray under the batteries in case of leaks. I am planning to move the starter batteries and the house batteries to inside the floor of the camper in between the camper frame rails but inside the sealed camper volume. Also I need to locate the house batteries somewhere. The location of the starter batteries (and air tanks) is where I want to install a second fuel tank. I am designing around an M1083 for an overland camper.
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