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Question:

Running a window unit AC from a battery bank?

I have this wild idea of powering a window unit from a battery bank. not 100% about how i would charge the batteries but just a crazy idea. Any suggestions on how i might be able to do it?

Answer:

Air conditioning compressors are poor candidates for battery power as they take a huge amount of amperage to start. Like the other person said, there is nothing to be gained from this unless the batteries are charged from something other than A/C power.
This was in Cars and Transportation so I assume you want to install the A/C in a vehicle. This is just a wild suggestion, but maybe you could put in the type of A/C that is made for travel trailers or custom vans. They are the type that mount to the roof. I'm fairly certain they run on 12 volts.
One concern you're dealing with is that something with a motor is going to have induction skill desires, which choose for an outstanding form of greater desirable amps to get them going, so which you will choose for greater desirable skill and amps to kick the unit on. For that, i does not enable the unit cycle simply by fact the kick-on's could extremely devour battery quicker. 2nd concern is that changing electrical energy to chemical battery skill is a loss of skill, to not point out the conversion from DC to AC. The conversion fee is around 80 5%, so which you lose approximately 15% except you spend precise dollar on the kit to get you closer to ninety 5%. All batteries additionally be afflicted by some style of deterioration effect so which you're able to save them consistently charged to maintain them waiting, which if for common skill outages could be a sturdy theory, if for exciting style of high priced.
The only way running a window air conditioner from batteries to be practical would be if you were getting the electricity for free. Like from wind or some other power source. Otherwise you would have to use AC to charge the batteries, which would be converting 120 AC to 12 DC then have to use an inverter to convert the 12 DC to 120 AC. Ok that is all fine and good, but with each transformation you loose power. So if you plan on charging up batteries then running your AC then you would be counterproductive.

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