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There's no requirement to vent AGM batteries. The wet batteries need to be vented, but the AGM system is completely sealed, so there's nothing to vent and, likewise, no danger of it venting toxic gasses to the interior. You should put some thought into preventing your system from overcharging the batteries, which might cause a release of energy in the form of a small explosion (hence the need to vent the more volatile lead-acid 'wet' battery type.)
Thanks for the responses. Stayingretired- sounds like my electrical usage would be similar to yours- lights, fan, water pump. But would prefer to be able to do some phone/laptop recharging or tv viewing. Lifeline has a 12 volt 255ah agm that I'm looking at but it's very expensive- shame to put it in the hands of a rookie. Not opposed to wet cell (nicer price) but would have to find a way to make underneath battery bay larger, or bring them inside and vent them.
Setup 280w solar, one panel, 180AH of batteries
Drain, Maxi fan on 90%, run all night.
Battery v at start 13.5 (float v) battery v at sunrise 12.4. Love the low power drain of the Maxi Fan
Battery v back to float before noon.
Ain't perpetual motion kool🤣
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