Converting Mini Split AC to DC Power w/ 48V Motor: Expert Advice Needed

AI Thread Summary
Converting a mini split air conditioner from AC to DC power for use with a 48-volt battery bank involves replacing the AC compressor motor with a compatible 48-volt brushless permanent magnet motor. The circuit board may need modifications, as it typically operates on 120 or 220 volts, and the user should confirm whether it can handle the lower voltage input. An alternative approach discussed is using a DC to AC inverter, which can convert 48V DC to 220V AC, although suitable inverters for 48V input may be limited. The power requirements of the air conditioner and the capacity of the battery bank must be carefully considered to ensure sustainability. A significant solar panel array will likely be necessary to support the energy demands of the system.
magnetic_mike
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I want to convert a mini split air conditioner from ac to dc so it can be powered by a 48 volt battery bank and rercharged by a solar panel and wind turbine hybrid system.(hybrid charge controller) I want to replace the ac compressor motor to a 48 volt brushless perminent magnet motor of similar rpm torque size etc. My questions are what about the the circuit board inside? Do I have change anything in there or will it work with the 48 volts from the battery bank? Is the 220 or 120 volt normnal current stepped down for the circuit board and it will step down any voltage input or do I need to make alterations there as well? I haven't tried it yet I am waiting for your expert advice. Thanks in advance. Magnetic_mike
 
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Welcome to PF...

...It depends on the air conditioner... But why aren't you trying the opposite: converting the 48VDC to 220V AC?
 
I want to run the air conditioner from a battery bank. Do know how many batteries it takes to get 220 volts? I want a system that is recharged from wind and solar panels. I want the air conditioner to be free from the grid.
 
magnetic_mike said:
I want to run the air conditioner from a battery bank. Do know how many batteries it takes to get 220 volts? I want a system that is recharged from wind and solar panels. I want the air conditioner to be free from the grid.

what Russ is saying to you, is for you to use a DC to AC inverter, now I don't know of any that have 48V input (there my be?), but there are plenty of 12V and 24V DC input ones with 220V AC output and have wattage ratings of up to 2 - 3kW.
Inverters are pretty efficient these days, 95 - 98%, it would definitely be worth investigating

regardless, you are going to have to consider the wattage required by the aircon and how long any sort of batter bank is going to be able to sustain that power drain before it goes flat. Its is going to require a serious solar panel array to handle the charging required

Dave
 

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