4kW Solar System Price in India: Cost, Subsidy & ROI Guide (2026)

If you have already looked at our 3kW and 5kW solar guides and felt like neither quite matched your electricity bill, a 4kW solar system might be the size you need. This guide covers the 4kw solar panel price in India, what you get for that price, the current government subsidy, and how quickly the system typically pays for itself.

A 4kW solar system is a medium-sized rooftop setup, sitting between a compact 3kW system meant for lighter electricity use and a larger 5kW system built for bigger homes or small commercial spaces. As a rough guide, it suits households or small offices with monthly electricity consumption of roughly 500 to 700 units.

If your bill sits at the lower end of that range, compare this against our 3kW solar system guide, since a smaller system may cover your needs at lower upfront cost. If consumption regularly crosses 700 units a month, our 5kW solar system guide will likely fit better. Think of the 4kW option as the sweet spot between the two.

One thing that trips up first-time buyers is the difference between the price of the panels alone and the price of the complete, installed system. These are not the same number.

Panel-only cost: Just the panels for a 4kW system typically cost between ₹1.1 lakh and ₹1.5 lakh, depending on the technology chosen.

Full system cost: The complete installed system, including the inverter, mounting structure, wiring, safety equipment, and installation labour, usually costs between ₹2 lakh and ₹3.5 lakh before subsidy. This is the number to budget against.

Prices also shift from city to city because of local DISCOM (Distribution Company, the local electricity supply utility) charges and installer rates. Market pricing in Ahmedabad, for example, tends to sit closer to the lower end, while Bengaluru often runs higher. We cover Gujarat-specific pricing in a dedicated section below, with more state-level breakdowns coming soon.

The subsidy under PM Surya Ghar Muft Bijli Yojana works on a slab basis rather than a flat percentage of system cost, and it is worth getting this right since some sources online still quote the older, outdated method.

Here is how it works for a 4kW system:

This means a 4kW system gets the same central subsidy amount as a 3kW system, ₹78,000, because the subsidy does not scale further past the 3kW mark. Once factored in, the effective price after subsidy for a 4kW system generally falls between ₹1.4 lakh and ₹2.5 lakh.

Several states add their own top-up incentives on top of the central subsidy. Uttar Pradesh, for instance, currently adds an extra ₹30,000 over the central ₹78,000. If you are in Maharashtra, check our dedicated state subsidy guide for the full eligibility and application process.

If you are based in Gujarat, current market pricing for a 4kW system typically runs ₹2.4 lakh to ₹2.45 lakh before subsidy. After the central subsidy and applicable state benefits, buyers in Gujarat can generally expect to pay around ₹1.6 lakh to ₹1.7 lakh for the complete installed system.

For the full eligibility criteria, documentation, and application process for Gujarat’s solar subsidy programme, refer to our dedicated Gujarat subsidy guide.

A few variables explain most of the price difference between quotes:

Under typical Indian sunlight conditions, a 4kW solar system generates roughly 16 to 20 units of electricity per day, or about 480 to 600 units per month. This lines up well with the 500 to 700 units/month consumption range mentioned earlier, meaning a 4kW system can offset most of a typical medium-sized household’s or office’s monthly bill, particularly when self-consumption is managed well.

Most residential buyers going through the PM Surya Ghar scheme opt for an on-grid system, since subsidy eligibility is tied to grid-connected systems and they also work out cheaper. Off-grid and hybrid systems, which include battery storage for power cuts, cost noticeably more because of the added battery and charge controller components. If backup power matters to you, get a separate quote for the hybrid variant, since pricing here varies more widely across brands than standard on-grid pricing does.

For most buyers, a 4kW solar system pays for itself in about 3 to 6 years after subsidy, though the exact number depends on local electricity tariffs, how much power you consume directly versus export to the grid, and your state’s net metering rules. Assuming a stable tariff over time, a well-maintained system can keep generating meaningful savings for roughly 25 years, making lifetime savings substantially higher than the initial investment.

For homes and small offices consuming 500 to 700 units a month, a 4kW system offers a strong balance between upfront cost and long-term savings, especially once the central subsidy is factored in. If your consumption is lower, our 3kW solar system guide may be more cost-effective, and if it is higher, take a look at our 5kW solar system guide instead.

A 4kW solar system in India typically costs ₹2 lakh to ₹3.5 lakh before subsidy and ₹1.4 lakh to ₹2.5 lakh after the PM Surya Ghar subsidy, with most buyers recovering their investment within 3 to 6 years. Get in touch with Alpex for a residential or commercial solar installation quote, or explore our solar PV module range to plan the system around verified components.