My setup supports the 2 most important things in the house.
The 12 volt Beer fridge and the Air Conditioner.
Without either of these the summers here would be unbearable.
There is also something quite satisfying about sitting in a cool house sipping icy cold beer on a stinking hot day knowing the sun has done all the cooling.
Step 1: The Beginning.
I bought mine on ebay for around $200. Winter is the cheapest time to buy one.
A trip to the local rubbish tip netted me an old BBQ on a stand with wheels at one end. I left the rusted out BBQ there and took the stand home.
A wooden pallet went with me.
The Air Cooler then had all the electrics, the huge 240 volt motor (unfortunately not permanent magnet) and the 240 volt pump unceremoniously ripped out (taking up space in my shed now if you want them).
It was then attached to the aforementioned pallet which was screwed to the top of the BBQ stand.
Now it's ready for step 2.
Step 2: The Pump.
I chose a 360 gallon per hour one purely on cost and Amps used (it uses about 2 amps).
It proved to be not quite powerful enough so I stopped the water flow to one of the panels so there was an adequate amount going to each of the other three ( I covered the now unused panel with plastic).
If your 12 volt system can support a bigger pump then buy a bigger pump.
About 500 gph would be perfect.
I have to be careful with every amp my panels produce.
Step 3: The Fan.
The Fan I chose for the unit is a single speed 16" after market car Radiator Fan.
It pumps lots of air and only draws 7 Amps.
I had to make an adapter to attach the fan to.
I used Masonite.
I cut a 20" circle and cut a 15" hole in the center of that.
I drilled a few holes and attached the fan with cable ties.
I mounted the wire cover off an old fan over the top of the fan to keep the Frogs out of the fan.
I should have mentioned earlier that the Air cooler has become a Frog habitat. Seven were living in it at last count. Any port in a drought eh.
Step 4: The Bendy Shiny Stuff.
I made a square wooden adapter for the house end and mounted it in an open window.
I bought a ducting vent attachment and screwed that to the wooden adapter.
The ducting was attached to that and the cooler was ready to be wired up.
Step 5: Wiring.
Sounds simple because it was.
Step 6: Water.
Any excess flow into the 10 liter container runs through an overflow pipe to a bucket.
We have moved into the village of Bethungra where the water pressure is much lower.
This has enabled me to connect the cooler to the town water mains and has simplified things immensely. No more filling containers to gravity feed into the cooler and much better water flow over the pads.
Still have Frogs living in it though. I have no idea how they get in there but they seem to love it.
Step 7: Enjoy.
Now turn it on, grab a beer and sit back and watch the Cricket (the Aussies are playing South Africa) in style.