3kW vs 5kW On-Grid Solar Systems: Which One is Right for You?

With the rising cost of electricity and the government’s push for renewable energy through schemes like PM Surya Ghar Muft Bijli Yojana, more homeowners and businesses are turning to on-grid solar systems. But one of the most common questions is: Should you go for a 3kW or a 5kW system?

In this blog, we’ll break down the differences to help you make the right decision.

🔆 What is an On-Grid Solar System?

An on-grid solar system is directly connected to the utility grid. It generates electricity during the day, and if excess power is produced, it is exported to the grid under the net-metering policy. At night or on cloudy days, you draw electricity from the grid.

This makes on-grid systems more affordable and efficient compared to off-grid systems, as there’s no need for expensive batteries.

⚡ 3kW On-Grid Solar System

A 3kW system is ideal for small households or offices with moderate power consumption.

✅ Key Features:

• Daily Generation: 12–15 units/day (360–450 units/month)
• Appliances Supported: Fans, lights, TVs, refrigerators, washing machines, laptops, and a 1.5-ton inverter AC
• Space Required: 250–300 sq. ft. rooftop
• Ideal For: Families of 3–4 members or small shops

💰 Cost & Subsidy:

Approx Cost: ₹1.8–2.2 Lakhs
Govt Subsidy (Residential): Up to 40% (under PM Surya Ghar Yojana)

⚡ 5kW On-Grid Solar System

A 5kW system is perfect for larger families or small businesses with higher electricity usage.

✅ Key Features:

• Daily Generation: 20–25 units/day (600–750 units/month)
• Appliances Supported: Everything in 3kW + multiple ACs, geysers, water pumps, computers, and other heavy loads
• Space Required: 400–500 sq. ft. rooftop
• Ideal For: Families of 5+ members, small commercial setups, offices, schools

💰 Cost & Subsidy:

Approx Cost: ₹3–3.5 Lakhs
Govt Subsidy (Residential): Up to 40% (under PM Surya Ghar Yojana)

🔄 3kW vs 5kW Solar System – Quick Comparison

Feature	3kW System	5kW System
Daily Generation	12–15 units	20–25 units
Monthly Savings	₹2,000–3,000	₹4,000–5,500
Space Needed	250–300 sq. ft.	400–500 sq. ft.
Appliances	Basic + 1 AC	Multiple ACs + Heavy Loads
Ideal For	Small Homes/Shops	Large Homes/Offices

🌞 Which One Should You Choose?

Choose 3kW if your monthly electricity bill is around ₹2,000–3,000, you have limited rooftop space, or your usage is moderate.

Choose 5kW if your bill is ₹5,000+, you use multiple ACs/heavy appliances, or you want to future-proof your home/business.

Tip: Always get your load assessment done by a trusted solar installer before deciding.

🚀 Why Choose SolSetu?

At SolSetu, we connect you with the best verified solar vendors across India. Whether you need a 3kW system for your home or a 5kW system for your business, our partners provide:

• ✔️ Customized Solar Plans
• ✔️ Hassle-free Subsidy Guidance
• ✔️ Installation & Maintenance Support