Can a Solar Inverter Run an AC?
Yes, a solar inverter can run an air conditioner. For optimal performance, an inverter with a capacity that matches or exceeds the AC's power requirements, typically ranging between 1 kW and 5 kW is good. And a pure sine wave inverter is the most suitable type of solar inverter to power an AC. For the pure sine wave inverter ensures a smooth, consistent power output that closely mimics the electricity from the grid, which is essential for the efficient and safe operation of sensitive electronics like air conditioners.
In this article, you‘ll get to know the right solar inverter size for different ACs
What Size Solar Inverter Is Good for Air Conditioners
Well, it depends on the specific AC types of different commom BTUs
Inveter Size for Central Air Conditioners
| Central AC Capacity (BTU) | Approx. AC Power Usage (kW) | Inverter Size (kW) |
| 12,000 BTU | 3.5 | 4 |
| 18,000 BTU | 5.3 | 6 |
| 24,000 BTU | 7.0 | 8 |
| 30,000 BTU | 8.8 | 10 |
| 36,000 BTU | 10.5 | 12 |
| 42,000 BTU | 12.3 | 14 |
| 48,000 BTU | 14.0 | 16 |
| 60,000 BTU | 17.5 | 20 |
| 72,000 BTU | 21.0 | 24 |
Inveter Size for Window Air Conditioners
| Window AC Capacity (BTU) | Approx. AC Power Usage (kW) | Inverter Size (kW) |
| 5,000 BTU | 0.5 | 1 |
| 8,000 BTU | 0.7 | 1 |
| 10,000 BTU | 0.9 | 2 |
| 12,000 BTU | 1.1 | 2 |
| 15,000 BTU | 1.4 | 3 |
Inveter Size for Split Air Conditioners
| Split AC Capacity (BTU) | Approx. AC Power Usage (kW) | Inverter Size (kW) |
| 9,000 BTU | 0.8 | 1 |
| 12,000 BTU | 1.0 | 2 |
| 18,000 BTU | 1.6 | 3 |
| 24,000 BTU | 2.1 | 3 |
| 30,000 BTU | 2.6 | 4 |
Inveter Size for Ductless Mini-Split Systems
| Ductless Mini-Split Capacity (BTU) | Approx. AC Power Usage (kW) | Inverter Size (kW) |
| 9,000 BTU | 0.8 | 1 |
| 12,000 BTU | 1.0 | 2 |
| 18,000 BTU | 1.6 | 3 |
| 24,000 BTU | 2.1 | 3 |
| 30,000 BTU | 2.6 | 4 |
Inveter Size for Portable Air Conditioners
| Portable AC Capacity (BTU) | Approx. AC Power Usage (kW) | Inverter Size (kW) |
| 8,000 BTU | 0.9 | 1 |
| 10,000 BTU | 1.1 | 2 |
| 12,000 BTU | 1.3 | 2 |
| 14,000 BTU | 1.6 | 3 |
Summary
For central air conditioners, inverters range from 4 kW for a 12,000 BTU unit up to 24 kW for a 72,000 BTU unit. Window air conditioners require smaller inverters, starting from 1 kW for 5,000 BTU models, up to 3 kW for 15,000 BTU models. Similarly, for split and ductless mini-split systems, the inverter sizes span from 1 kW for 9,000 BTU models to 4 kW for 30,000 BTU units. Portable air conditioners typically need inverters from 1 kW to 3 kW.
FAQs
What is the difference between a modified sine wave inverter and a pure sine wave inverter for running an AC?
A pure sine wave inverter produces a smooth, consistent waveform that mimics grid power, making it ideal for sensitive electronics like air conditioners. A modified sine wave inverter, on the other hand, generates a more stepped or squared sine wave, which can cause issues with efficiency and noise in air conditioning systems.
Can solar inverters handle the startup surge required by air conditioners?
Air conditioners often require a higher power surge when starting up. Ensure that the solar inverter’s surge capacity is sufficient to handle this initial load, which can be up to 3 times the continuous rating.
How do I calculate the total power requirement of my air conditioner to choose the right inverter?
To calculate the total power requirement, look at the air conditioner's specification plate for its wattage, or multiply the BTU rating by the power factor (usually around 0.8-0.9 for ACs). Add a margin to account for inefficiencies and initial power surges.
How does ambient temperature affect the efficiency of solar-powered air conditioning?
High ambient temperatures can reduce the efficiency of both solar panels and air conditioners. It's important to ensure that solar panels are well-ventilated and air conditioners are placed in shaded or cooler areas to maximize efficiency.
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