Quick Answer
A mini split air conditioner typically draws between 400-800 watts of power, depending on its model and settings, which can be a significant load for off-grid solar systems and batteries.
Understanding Mini Split Wattage
Mini split air conditioners are popular for their efficiency and flexibility, but they do consume significant power. Typical models range from 9,000 to 36,000 BTU, with a corresponding wattage draw of 400-1,200 watts. For example, a 12,000 BTU model might draw around 600 watts, while a 36,000 BTU model can use up to 1,200 watts. To accurately determine the power requirements, consult the air conditioner’s specifications.
Calculating Battery Requirements
When sizing batteries for a mini split air conditioner, consider its daily energy consumption and the desired run time. To calculate the battery capacity needed, multiply the daily energy consumption (in watt-hours, Wh) by the desired run time (in hours). For instance, if the air conditioner consumes 600 Wh per day and you want it to run for 8 hours, you’ll need a battery that can deliver 4,800 Wh (600 Wh x 8 hours). This calculation assumes the air conditioner will run continuously for 8 hours, but in reality, you may want to add a buffer for other loads and inefficiencies.
Charging and Discharging Considerations
When designing an off-grid solar system to power a mini split air conditioner, consider the charging and discharging characteristics of the batteries. Deep cycle batteries, like AGM or lithium-ion batteries, are suitable for off-grid applications. Ensure the solar panel array is sized to recharge the batteries within a reasonable time frame, taking into account the battery’s charging characteristics and the system’s overall efficiency. For example, if the air conditioner draws 600 watts and the solar panel array produces 1,000 watts, the excess energy can be used to charge the batteries.
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