Solar Panel Size CalculatorHow Many Panels to Run Your ACs?
Add all your air conditioners, set daily usage hours, and instantly get — system kW required, exact panel count, roof area needed, and total installation cost estimate.
Add Multiple ACs
Enter every AC in your home — bedroom, hall, office — and get sizing for your full load, not just one unit.
Roof Area Check
Instantly see how many square feet of roof space your solar array will need before calling an installer.
Full Cost Estimate
Get a realistic installation cost estimate based on 2026 India market rates, before you even talk to a vendor.
Solar Panel Size Calculator
Add all your ACs → get exact system size, panel count & roof area
Step 1 — Your Air Conditioners
Step 2 — System Configuration
Average India: ₹6–9/unit. Check your bill.
Quick Summary
Step 3 — See system kW, panel count, roof area & cost estimate
Quick Reference — Solar Size Guide for Common AC Setups
Based on 5.5 peak sun hours (average India), 400W panels, 80% system efficiency
| AC Setup | Star Rating | Daily Load | System Size | No. of Panels | Roof Area | Est. Cost (Before Subsidy) |
|---|---|---|---|---|---|---|
| 0.75T | 5★ | 4.2 kWh | 1 kW | 3 panels | ~65 sq ft | ₹50K |
| 1T | 5★ | 5.4 kWh | 1.25 kW | 4 panels | ~85 sq ft | ₹65K |
| 1.5T | 5★ | 7.8 kWh | 1.8 kW | 5 panels | ~105 sq ft | ₹92K |
| 1.5T | 3★ | 10 kWh | 2.3 kW | 6 panels | ~130 sq ft | ₹1.15L |
| 2T | 5★ | 10.4 kWh | 2.4 kW | 6 panels | ~130 sq ft | ₹1.2L |
| 2T | 3★ | 13.2 kWh | 3 kW | 8 panels | ~170 sq ft | ₹1.5L |
| 2×1.5T | 3★ | 20 kWh | 4.6 kW | 12 panels | ~260 sq ft | ₹2.3L |
| 3×1.5T | 3★ | 30 kWh | 6.8 kW | 17 panels | ~370 sq ft | ₹3.4L |
PM Surya Ghar subsidy can reduce these costs by up to ₹78,000. Calculate your subsidy →
How the Solar Sizing Formula Works
Solar panel sizing for ACs follows a simple but precise formula. The key is calculating your total daily energy load in kWh — the sum of all AC units running their daily hours.
From there, the system size in kW = daily load ÷ (peak sun hours × inverter efficiency). India's average is 5.5 peak sun hours, and modern string inverters run at ~80% efficiency.
Panel count = system kW ÷ panel wattage. Roof area adds 15% margin over the actual panel dimensions for gaps and clearance. Installed cost runs ₹45,000–₹55,000 per kW in 2026 (all-inclusive).
The Formula
Solar Panel Sizing — FAQ
Everything you need to know before buying solar for your ACs
A 1.5 ton 3-star inverter AC uses about 1,250W. Running 8 hours = 10 kWh/day. With 5.5 peak sun hours and 80% inverter efficiency, you need roughly a 2.3 kW system — about 6 panels of 400W each. Roof area needed: ~120 sq ft.
