Solar power is becoming more popular in India as people look for ways to save money on electricity bills and ensure power backup during blackouts. If you already have a 150Ah battery and want to charge it using solar energy, the biggest question is: what size solar panel do you need, and how much will it cost? In this article, we’ll explain everything in simple words to help you make a smart decision.
How Much Power Does a 150Ah Battery Need to Charge?
A 150Ah battery usually comes with a 12V rating. To fully charge this battery, you need to generate:
12V × 150Ah = 1800Wh, which is 1.8 units of electricity.
In India, solar panels get about 4 to 5 hours of direct sunlight each day. If we take 4 hours of effective sunlight, the required panel size will be:
1800Wh ÷ 4 = 450W
But due to real-world issues like clouds, dust, and wiring losses, it’s smarter to go for a slightly bigger panel — around 500 watts.
How Much Does a 500W Solar Panel Cost in 2025?
Solar panel prices in 2025 have become more affordable. Several well-known companies offer high-quality panels at reasonable rates. Here’s a simple table showing the current prices:
| Brand | Panel Size | Estimated Price |
| Luminous | 250W × 2 | ₹12,000 – ₹14,000 |
| Loom Solar | 400W Shark | ₹10,000 – ₹11,500 |
| Tata Power | 500W Mono | ₹13,000 – ₹15,000 |
These are just the panel prices. If you include charge controller, wiring, mounting structure, and installation, the total cost for the full setup can be around ₹18,000 to ₹22,000.
What Extra Items Do You Need?
Installing only the panel is not enough. You also need a charge controller to protect your battery from overcharging or undercharging. You can choose between:
- PWM Controller – Cheaper, less efficient.
- MPPT Controller – Costlier, but 30% more efficient.
You’ll also require good-quality wires and a strong stand for mounting the panel. Make sure to install the panel in a place where it gets direct sunlight throughout the day, like a rooftop with no shade.
Take Advantage of Government Subsidies in 2025
The Indian government is promoting solar power under the PM Surya Ghar Yojana, offering up to ₹30,000 subsidy on 1kW systems. Some states like Delhi, Uttar Pradesh, and Bihar are also offering extra subsidies between ₹10,000–₹15,000.
But keep in mind: this subsidy is generally available if you’re installing at least a 1kW solar system, not just a 500W panel. So, if you have long-term needs, upgrading to a bigger system can help you save more and get subsidy benefits too.
Also Read – 👉 Loom Solar Launches Shark 450 Watt Bifacial Solar Panel, Generating Double Power from Both Sides!