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12v greenhouse ventilation solar

Wed 27-Jun-12
10:39 pm

fatfatjake

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Hi all I'm planning making a 12v solar fan powered ventilation system for my greenhouse / glasshouse

My plan is to use a 12v car battery

a 12v computer fan,

A Thermostatic switch

http://www.ebay.co.uk/itm/130469371806?ssPageName=.....146wt_1163

A 12v solar trickle charger for the car battery

http://www.ebay.co.uk/itm/4-Watt-12v-Volt-Solar-Pa.....4347wt_905

The greenhouse has a automatic opening window, which will open at 15 to 25 C

The fan will come on at about the same temp, is this a practical setup?

Thanks

Jake

Thu 28-Jun-12
6:47 am

Aly

Normandy France

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Welcome to the forum Jake. wave
Bit technical for my brain but there some inventive bods here who will be able to help. You are obviously into self sufficiency and it would be good to hear a bit about you. There is an introduction page you could post on. Lots of us are doing for ourselves and not just in the UK. Hope you will stick around smile

Trying to enjoy life as it is

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Thu 28-Jun-12
2:10 pm

Hannah

Suffolk

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How big is the greenhouse?- a computer fan is very small, so not sure if that will be enough to ventilate it. I am sure the set up will function- depends on what wattage the solar power panel can give out- have one on my caravan to trickle charge the battery to keep the alarm functional, but at times even this is not enough to hold the charge. I think mine is 15 W from memory.

Are we having fun yet? I am!

Sat 30-Jun-12
7:24 pm

fatfatjake

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8 x 6 foot

The fans are only 0.16 amp

Was playing with the idea of putting two in one set to in one to out to generate more flow

both on the same wall in opposite corners and sides so one top left the other bottom right

Cheers

Jake

Sat 30-Jun-12
7:46 pm

Hannah

Suffolk

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I think you can only try and see what happens- and if it works, let us all know- it may be something we can all copy.

My greenhouse is a similar size to yours.

Are we having fun yet? I am!

Sat 30-Jun-12
10:52 pm

Toffeeapple

North Bucks

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fatfatjake said:

two in one set to in one to out to

I have read this section seven times and it still makes no sense what so ever - - -are you speaking binary here? Eight times now - still no idea.

I'll try that again!

Sun 1-Jul-12
5:30 am

Bulgaria

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I saw ebay and thought...advert....so moved on... sorry ...if I'm wrong Jake...

Who lives long sees much : The diary of my life in Bulgaria

Sun 1-Jul-12
3:21 pm

fatfatjake

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@ EP.....No advert

@ Toffeeapple ......Hope this makes it bit clearer

1 fan making air go inn top right corner

1 fan making air go out bottom left corner

Thus creating air movement as well as flow and ventilation

May be able to make it cheaper by using the auto window to become the switch also, and just using a push switch

Try and make something and post back later in the week

Mon 2-Jul-12
6:03 am

Danny

Scarborough, England

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Interesting idea, Jake. I am less technical with electrics than Martin (Liquineer) is but I understand your objective. This is a question for somebody with a bit of an electrical engineering background who may understand the flow rates and power consumption of fans.

I guess at worst your set-up may not be effective enough and you might have to go for a bigger fan even at a slower RPM.

Do please update us as you make progress.

Never knowingly underfed

Mon 2-Jul-12
6:39 am

seth

lincolnshire fens