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Okay, so my truck has 4 floodies up front under the hood. I'm in the habit of propping up the hood a few inches while I'm charging in order to allow the batteries to vent.

My question is- is this really necessary? Do four batteries need this much venting? Or will leakage around the edges of the hood be adequate?

I'm just asking because it's kind of an annoyance- I'm trying to get my truck to the "plug it in and walk away" stage. :cool:
 

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There's nothing in the overkill NZ Rulebook about popping your hood when charging. Of course Hydrogen does rise and might get trapped under your hood. But at the same time, car bonnets are not watertight. They're full of gaps around the top. I wouldn't worry about it.
If you're concerned, why not set up a little low amp brushless fan under there to keep circulation going?
 

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I'd concur. Hydrogen is the smallest, lightest, and most "slippery" of the elements, comprised of a single atom. It's difficult enough to keep it in a sealed container, any hydrogen released under the hood of a vehicle will immediately dissipate without the help of a fan. What you really want to avoid is the accumulation of hydrogen, or, more correctly, hydrogen sulfide gas, from the charging of the batteries. As long as your batteries aren't under some type of enclosure that could cause the gas to "pool up" in an inverted hollow, you can just as well forget it.
 
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