But the most common question is: How many watts of solar panels are needed to run an AC? The answer depends on the type of AC, usage hours, and system efficiency.
Understanding AC Power Consumption
Air conditioners come in different sizes and power ratings. Here’s a quick look at the average consumption:
| AC Type | Power Consumption (Per Hour) |
|---|---|
| 1 Ton Inverter AC | 700 – 900 Watts |
| 1.5 Ton Inverter AC | 1,200 – 1,500 Watts |
| 2 Ton AC | 1,800 – 2,200 Watts |
Let’s assume you want to run a 1.5 Ton Inverter AC for about 6 hours a day in summer.
- Total Daily Consumption = ~1.5 kW x 6 = 9 units/day
Solar Panel Requirement
To produce 9 units of electricity daily, you would need a system that can generate about 9–10 kWh/day. In India, 1kW of solar panels typically generates 4 units/day under good sunlight.
Recommended Solar Capacity:
- Minimum Required: 2.5 kW system (generates ~10 units/day)
- Optimal Setup (with battery or cloudy backup): 3 kW or more
This means you’ll need around:
- 7–8 solar panels (each 330–400W)
- Inverter + battery (optional for backup)
- Net metering if you want to export excess units to the grid
Off-Grid vs. On-Grid for AC
- On-Grid Solar System: Best for homes with stable electricity. Your AC runs on solar during the day, and you export excess units to the grid.
- Off-Grid Solar System: Needs battery backup, costs more. Useful in areas with power cuts or no grid connection.
Final Word
To run a 1.5 Ton AC on solar power in India, you need at least a 2.5 kW to 3 kW solar panel system. With government subsidies under schemes like PM Surya Ghar Yojana, the setup is becoming more affordable and accessible to homeowners across the country. It’s not just about saving money—it’s about cooling your home sustainably.
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