Author Options:

How much solar panels and batteries do you need to power a 3/4 HP airconditer? For 3 to 4 hours. Answered

 I got a window type 3/4 Horsepower Air Conditoner and the afternoon sun is cooking me up like an oven in my apartment.  I could place a solar panel by my window and use that energy to cool my room.  I work at nights and if can enjoy 3 t0 4 hours of cooling to get some comfortable sleep.  Around 11 noon to 3pm.  It would be bliss.


Commercial Solar Panels are Expensive!
Fact: It will take you more than 10 years to pay back
Solution: Using Surplus Solar Cells You can get pay back in 1-2 years
There is an Engineer from Chicago his name is John Sommer
He explain it All in his diy solar panels Blog Search for him using Google
Type "top diy solar panels" Open the first Result.
Note: Ignore the adds at the top.

Solar in an apartment for that is not realistic (though if you wanted to put up panels inside for a few hours of battery charging, or for maybe enough to run a fan, then you have something.)

There are two issues. First, you have to keep the heat from building. If it is being radiated in from surrounding apartments, well, there's not much you can do about that.

Most likely you can see what you can do to cover up windows, sliding glass doors, etc. You need it dark, might as well insulate it as well with some curtains to keep out the sunlight and the heat. You can also check for drafts (poorly sealed windows/doors) and try to keep that out as well. Simply putting a towel by the door will work wonders.

Next you have to cool off. Innovative ways to do this? Do a search here for "air conditioner" (https://www.instructables.com/tag/?q=air+conditioner&limit%3Atype%3Aid=on&type%3Aid=on&type%3Auser=on&type%3Acomment=on&type%3Agroup=on&type%3AforumTopic=on&type%3AforumTopic=on&sort=none). You could also just freeze water in a large dish. When you're ready for sleep, pull the dish out, set it in front of the fan, and go to sleep (make sure it's far enough away or the air isn't direct so you don't get splashed).

Sell your window unit, save the money and the money from the monthly bills, and get yourself an apartment with AC.

Maybe you could mount a big fan or blower in a window, arranged so it blows the air outside.  Then cool air (plus cooking and laundry and pet smells) from other apartments will be sucked into yours.

If you aren't charged for water consumption, run cold tapwater through a car radiator with a fan mounted on it.  Or, more efficient, get or make a cooling blanket for your bed and run cool tapwater through it.  Or, only slightly crazier... build a room within a room, heavily insulated, just big enough for a bed, and cool that with the A/C as required.

You are not being BAKED... you are being BROILED.  Just like an oven broiler where the heat is coming from above you.  Your attic is likely 140 degrees F.  ... and this brings indoor temperature up to 95 to 100 degrees.   At my house i did many changes and experiments and finally i REDUCED my house temperature from about 95 F down to about 83 F. by simply reducing attic temperatures down to about 110 degrees.  Now, we barely even need the airconditioner.  I plan on building a PASSIVE geothermal system to further bring down house temperatures another  5 or 10 degrees to about 70 degrees this summer.. but sofar... here is my ATTIC COOLING method for you to look at that i posted on FIELDLINES.COM a couple years ago.   http://www.fieldlines.com/story/2009/9/4/3211/83586 

You cant use solar cooling unless you FIRST lower the excessive heat. Solar airconditioning would require many hundreds of watts to accomplish otherwise.  A solar panel of about 3 ft by 4 ft would only generate 45 watts of electricity.  at a cost of about $200.00 to 500.00 depending on the brand you buy and who installs it.  You would need about TWENTY of those sized panels. 


8 years ago

A solar panel large enough to generate enough power for that A/C unit will occupy a not insignificant amount of space on the apartment roof.

Better to put some solar glazing or other reflective material in the window to bounce that light back out.

1 horsepower = 745.699872 watts

(by websearching "horsepower watt")