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Home Forums Technical Discussion Looking for a 4″ solar fan for my greenhouse.

This topic contains 9 replies, has 6 voices, and was last updated by  WrethaOffGrid 4 years, 7 months ago.

Viewing 10 posts - 1 through 10 (of 10 total)
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  • #37180

    koolex11
    Participant

    Hello to everyone. I am new here and very glad to have found a site that deals with off-grid living. I have recently built a dome greenhouse and I now want to power several components with PV.

    The first element I want to get started is my subterranean heating system. I have about 100feet of 4 inch tubing buried inside and under the greenhouse, and I want to move air through it using a small 12 volt fan.

    Ideally I want to use a fan that can move about 70CFM. This would provide adequate circulation without much wattage. Sadly, I have only been able to find computer fans (too weak) and a bilge fan for boats that pulls 3.5A DC. Way too much. I want to power the fan with a 10 watt solar panel.

    Any ideas?

    #43013

    ttab
    Participant

    Hey Koolex; Welcome to the group. Please tell us more about your greenhouse and how you plan to heat it. Photos or drawings would be helpfull also. ( I have no idea how that is done but…)

    Sunny days!

    #43018

    koolex11
    Participant

    18′ diameter geodesic dome made out of 2×4’s and 6 mil greenhouse film. Insulated foundation, thermal pond, and the aforementioned underground heat system. Plans to incorporate a solar thermal collector to heat the pond. I don’t know how to upload pics but you can see all my progress at http://geogrow.blogspot.com Since early last winter I have documented my construction and it is now starting to look good! I hope you check it out and like it…

    #43019

    WrethaOffGrid
    Keymaster

    Looks good koolex11 :)

    Are you planning on growing some edible fish or perhaps doing some hydroponics?

    Wretha

    #43020

    elnav
    Member

    suggest getting industrial AC fans of right size and flow then use small inverter to power it. maybe not quite as efficient but it works.

    #43023

    12vman
    Participant

    Ebay is your friend. Search solar attic/greenhouse fans and I’m sure that you will find something to fit the bill.

    #43027

    koolex11
    Participant

    Wretha: I am planning both. I think catfish would be a good choice for my climate (PA) and I love hydroponics, especially for lettuces. Will definitely try the whole aquaponics circle of life too.

    #43043

    ttab
    Participant

    Hey Koolex;

    Let us know how that new fan works out. I have some other ideas if it doesn’t work out the way you want.

    Good Luck!

    #43045

    Nick Rosen
    Keymaster

    Actually, just FYI, this topic would be better in the technical forum, but now its here, I just wanted to mention ~I saw a lot of solar fans in the Emerald triangle – pot-growing country. they sell for about $70 in most solar stores and everyone knows they are used to dry out marijuana

    So it depends where you live, but if you go to your local dope growers supplier you might find what you are looking for

    #43050

    WrethaOffGrid
    Keymaster

    It’s now in the technical forum. :)

    Wretha

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