Ever looked at your electricity bill and wondered, “Is there a way to escape this?”
Spoiler alert: There is, and it is powered by sunlight.
Let’s look at a 3 kW rooftop solar system that can power most mid-sized homes in India, which typically use between 300 and 400 units of electricity every month.
Before solar: The monthly bill blues
Your home consumes between 300 to 400 units of electricity per month. At an estimated rate of ₹8 per unit (although tariffs vary by state), it results in monthly bills that may look like:
| Usage (units) | Energy charges (at ₹8/unit) | Fixed charges and taxes | Total monthly bill |
|---|---|---|---|
| 300 units | ₹2,400 | ₹600 | ₹3,000 |
| 400 units | ₹3,200 | ₹800 | ₹4,000 |
The annual damage? ₹36,000–₹48,000. And this amount increases with tariff hikes.
Installing a 3 kW solar system
You invest in an on-grid solar system with net metering, backed by a government subsidy amounting to ₹78,000 under the PM Surya Ghar Yojana.
- Total cost of the system: ₹2.30–₹3 lakhs*
- Maximum subsidy availed: ₹78,000
- Net investment by you: ₹1.52–₹2.22 lakhs
Once the installation is done, you are officially generating your own power.
*Note: The total cost of a rooftop solar system depends on several factors such as site structure, choice of panel and inverter technology, and specific installation requirements, including cabling and metering.
After solar: The sunny side of savings
If you get around 5 hours of usable sunlight per day, and your system runs at 80% efficiency, we can calculate how much energy is generated by your 3 kW system using the following formula:
System size (in kW) × Peak sun hours × Efficiency = Energy (in units or kWh)
So, for a day, you receive 3 × 5 × 0.8 = 12 units of power. Over a month, that adds up to 12 × 30 = 360 units, which meets the typical energy requirement of 300–400 units per month.
Considering the above calculation, here’s the comparison of the electricity bill:
| Grid consumption | Solar generation | Energy charges (at ₹8/unit) | Fixed charges | Total monthly bill | |
|---|---|---|---|---|---|
| Before solar | ~300 units | 0 units | ₹2,400 | ₹600 | ₹3,000 |
| After solar | 0 units | 0 units | ₹0 | ₹600 | ₹600 |
That is ₹2,400 saved every month! Even if you factor in seasonal dips, annual savings hover around ₹28,800.
Smooth sailing: Maintaining your solar system
The estimated costs of solar system maintenance typically covering panel cleaning, inspections, and minor repairs ranges from ~₹1,600 - ₹3,300 per kW per year. Your 3 kW system could entail an annual maintenance cost of ~₹5,000 - ₹10,000.
Note: This is a tentative estimate based on current industry benchmarks and installer quotes for small residential systems across India. Costs vary by location, service provider, and whether you opt for an AMC (Annual Maintenance Contract), which may offer bundled discounts.
Break-even point and return on investment
| Your cost and savings breakdown | Amount (INR) |
|---|---|
| Initial investment | ₹1,52,000 |
| Annual savings on electricity (₹2,400 per month saving x 12 months) | ₹28,800 |
| Estimated annual maintenance (low estimate) | ₹4,800 |
| Net annual savings = (Annual savings on electricity - Estimated annual maintenance) | ₹24,000 |
| Break-even point (Years) = (Initial investment/ Net annual savings) 1,52,000/₹24,000 | ~6 years* |
* Note: The break-even point will vary based on the initial investment cost and the net annual savings.
Energy independence in your hands
When you pair your solar savings with advanced technologies like Enphase microinverters, the returns only get better. Unlike traditional systems where shading or a fault on one panel affects the whole array, microinverters optimise each panel individually, ensuring maximum energy harvest, even in partial shade or varying orientations.
Add the IQ Battery 5P to your solar system, and you can enjoy reliable backup during power cuts, even powering energy-intensive appliances like air conditioners and refrigerators throughout the night. That is a step toward true energy independence! When combined with the subsidies and a moderate upkeep, your 3 kW solar setup becomes more than just a money-saver, it is a smart, sustainable upgrade for life.
