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

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SUMMARY

The discussion focuses on converting a mini split air conditioner to operate on a 48V DC power system, powered by a battery bank and recharged via a hybrid solar and wind turbine setup. Key considerations include replacing the AC compressor motor with a 48V brushless permanent magnet motor and assessing the compatibility of the existing circuit board with the new voltage. Participants suggest exploring the use of a DC to AC inverter, as most available inverters operate on 12V or 24V inputs, and emphasize the importance of calculating the air conditioner's wattage requirements and the capacity of the solar panel array needed for efficient operation.

PREREQUISITES
  • Understanding of 48V brushless permanent magnet motors
  • Knowledge of hybrid charge controllers for solar and wind systems
  • Familiarity with DC to AC inverters and their specifications
  • Basic electrical engineering principles related to voltage and wattage calculations
NEXT STEPS
  • Research 48V brushless permanent magnet motors suitable for mini split AC applications
  • Investigate hybrid charge controllers compatible with solar and wind energy systems
  • Explore available DC to AC inverters with 48V input options
  • Calculate the wattage requirements of the mini split air conditioner and determine the necessary solar panel array size
USEFUL FOR

Individuals interested in off-grid living, renewable energy enthusiasts, HVAC technicians, and anyone looking to optimize energy efficiency in air conditioning systems.

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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