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Small peltier dehumidifier
- Thread starter Athos
- Start date
G
Guest
sorry, I read petite not Peltier
Last edited:
AgentPothead
Just this guy, ya know?
Athos is asking about dehumidifier, not a humidifier. And if your humidity is high, then yes it will help. You then have to find a balance between energy usage, and how often you have to empty the damn thing. You can always get a smaller dehumidifier and let the tank drain into a larger reservoir for less often emptying. Some of the larger ones come with the attachment already you just connect a hose.
Peltier cells are far from efficient, how small is your setup? how high is your RH. My setup got a minisplit but RH dont go under 70% yet. I'm very interested in the thread. 
AgentPothead
Just this guy, ya know?
I think with such a small space, the best way to control humidity would be more air exchange. If that isn't possible, I think a small peltier based dehumidifier like https://www.amazon.com/hOmeLabs-Small-Dehumidifier-Bathroom-Closet/dp/B072C3NMK1 would probably work OK, but you are gonna have to be draining it a lot I think, unless you get some way to drain it into a larger reservoir. You can also try something like https://www.amazon.com/gp/product/B0029EGUNG/ but those are disposable, so I only bought 2 and then realized it wasn't worth it and was a better buy to just get a dehumidifier.
Finally I got around getting a small dehumidifier. It's a small 22 watt peltier dehumidifier that I got at the local store. It's small enough to fit inside the grow box without taking vital space, been only 25 cm (10 inches) tall. While it's not great, it does an ok job. My lights on / off humidity was 90% / 99% usually with all the inside walls and roof completely wet, now it sits at 60% / 70% with no wet spots anywhere, coupled with 4 small fans that circulate the air inside above and below the canopy, there are no wet leaves or flowers.
While using a bigger dehumidifier on the room might be better, using a 200 watt dehumidifier for a 100 watt grow is kind of ludicrous, at least to me.
From what I read online, 1 cubic ft of air at 25°C holds 23 gr of water (100% humidity), so 7 cu ft of air can hold 161 gr, as long as the dehumidifier can lower 20% to 40% humidity in this space then it's good to me, in this case it amounts to 32 to 64 gr (roughly between 1 and 2 oz)
Probably this will only work in really small spaces, like what I have.
While using a bigger dehumidifier on the room might be better, using a 200 watt dehumidifier for a 100 watt grow is kind of ludicrous, at least to me.
From what I read online, 1 cubic ft of air at 25°C holds 23 gr of water (100% humidity), so 7 cu ft of air can hold 161 gr, as long as the dehumidifier can lower 20% to 40% humidity in this space then it's good to me, in this case it amounts to 32 to 64 gr (roughly between 1 and 2 oz)
Probably this will only work in really small spaces, like what I have.
AgentPothead
Just this guy, ya know?
That seems worth it to me dropping down to 60-70% from 90-99%! That should help a lot if you were having any molding during flower.
I'm shocked it worked so well, but as it was so high, it probably would of condensed on anything.
200w sounds a lot, but many have a built in humidistat, or you could add one. Then it only runs when it needs to, so it's not 200w all the time. A refrigeration based dehu, is about 3 times more power efficient than a thermoelectric one like you have.
70% in bloom is still high.
200w sounds a lot, but many have a built in humidistat, or you could add one. Then it only runs when it needs to, so it's not 200w all the time. A refrigeration based dehu, is about 3 times more power efficient than a thermoelectric one like you have.
70% in bloom is still high.
Herbal Tea
New member
I don't have high humidity every day but when I do I simply put a frozen bottle of ice into my micro grow. Take a my humidity from as high as 90 down to 55. From experiments i find that if you remove some humid from the air entering the tent, it'll be easier to keep it low. Same happens with the bottle in front of my intakes.
