To run a 1.5-ton AC, the number of solar panels you need depends on several factors, including the AC’s energy consumption, hours of daily usage, panel efficiency, and whether you’re using a grid-connected or off-grid system. Here’s a detailed breakdown:
Energy Consumption of a 1.5-Ton AC
- Power Requirement:
A 1.5-ton AC typically consumes 1.5–2 kW/hour, depending on the star rating and whether it’s inverter or non-inverter technology. - Daily Energy Requirement:
If the AC is used for 8 hours/day, the total energy needed is:- 1.5 kW × 8 hours = 12 kWh/day
- This is approximately 12 units/day of electricity.
Solar Panel Calculation
- Average Solar Panel Output:
A standard solar panel generates 350–400 W/hour under optimal sunlight conditions (4–6 peak hours of sunlight/day). - System Size Needed:
To generate 12 kWh/day:- 12 kWh ÷ 5 sunlight hours = 2.4 kW system
- Number of Panels:
Using 400 W panels:- 2.4 kW ÷ 0.4 kW = 6 panels
Recommended Solar System Size
To ensure efficiency and account for energy losses (inverter efficiency, weather conditions, etc.), you should consider:
- 3 kW solar system (around 8 panels of 400 W each).
Space Requirement
Each solar panel requires approximately 20 sq. ft. of space.
- For 8 panels, you’ll need around 160 sq. ft. of roof space.
Additional Considerations
- Inverter Capacity:
- A 3–5 kW inverter is ideal to handle the load and future expansion.
- Battery Backup (Optional):
- If you plan to use the AC at night or during power cuts, you’ll need a battery bank of 10–15 kWh capacity.
- On-Grid vs. Off-Grid:
- On-Grid System: Directly connected to the grid, no need for batteries.
- Off-Grid System: Requires batteries, increasing costs.
- Subsidy Benefits:
- Government subsidies can reduce the cost of solar installations by 20–40%, depending on your region.
Cost Estimation
| Component | Cost Range (₹) |
|---|---|
| Solar Panels (3 kW) | ₹1,50,000 – ₹2,00,000 |
| Solar Inverter (5 kVA) | ₹50,000 – ₹75,000 |
| Battery Backup (Optional) | ₹1,00,000 – ₹1,50,000 |
| Installation & Wiring | ₹20,000 – ₹30,000 |
| Total Cost | ₹2,20,000 – ₹4,50,000 |
Conclusion
- For a 1.5-ton AC, you’ll need a 3 kW solar system with 6–8 solar panels (400 W each).
- A grid-connected system is more cost-effective if night usage isn’t a concern.
- Ensure a professional solar installer designs the system to maximize efficiency and reliability.
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