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all you need is this
1-Co2 tank 30lb
1-low pressure tank regulator
1-1/4" parker solenoid valve 12v
1-photo switch from lowes
2-rechargable 9v batteries - wired in series-
1-cheap solar battery charger
when the lights are on it charges the 9v when the lights go out it turns the solenoid on and releases Co2
that will turn co2 on and off when fans go out. if so that is pritty cool way better than my idea. i will figure out how that works. thanks. or does that just turn co2 off when lights go off?
seems like that would be the same thing. you still need a little light to go on outside the grow room. cause i created a system that turns co2 on when fans are on and off when fans off.
(in a un teck little kid way)
thats just for my Co2 my fans run 24/7 an i got my Co2 bottle in the room because a warm Co2 bottle lasts longer an i forgot i have an expansion chamber for pb guns to help with that even more
right on cool.