Quick Answer
Powering air conditioning off-grid with solar is feasible, but requires a substantial solar array and battery bank. A typical mini-split AC unit with a 12,000 BTU capacity will consume around 1,200 watts of power. A well-designed system can meet this demand, but precise calculations and careful planning are necessary.
Choosing the Right Mini-Split AC Unit
When selecting a mini-split AC unit for off-grid operation, look for a model with a high SEER (Seasonal Energy Efficiency Ratio) rating, which indicates its efficiency. A 12,000 BTU unit with a SEER rating of 20 or higher can help minimize energy consumption. Some popular models include the Mitsubishi M-Series and the Fujitsu Halcyon II.
Sizing the Solar Array
To power a 12,000 BTU mini-split AC unit, you’ll need a solar array that can produce at least 1,200 watts of power per hour. Assuming an average daily energy consumption of 9 kWh (1,200 watts x 7.5 hours), a solar array with a total capacity of 2-3 kW (12) is recommended. Use a solar panel calculator to determine the required array size based on your location’s solar irradiance and the AC unit’s power consumption.
Battery Bank Sizing and Charging
A deep cycle battery bank with a capacity of 4-6 kWh is necessary to store excess energy generated by the solar array during the day for use at night or during periods of low sunlight. When selecting batteries, choose a model with a high depth of discharge (DOD) rating to ensure reliable operation. The charging system should be designed to recharge the battery bank within 8 hours of peak sun exposure. A maximum power point tracking (MPPT) charge controller and a high-efficiency inverter are essential components of a well-designed off-grid system.
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