50 kW Solar Plant Cost: What It Costs and Needs in Roof, Connection and Approvals

A 50 kW solar plant for a factory or commercial building costs roughly ₹12–16 lakh excluding GST, based on the published Secured Engineers C&I band of ₹24,000–32,000 per kW. It needs about 5,000 sq ft of shadow-free roof, generates around 6,000 units a month in north India, usually connects on the LT side, and needs a DISCOM net-metering approval.

Indicative cost at 50 kW

Secured Engineers publishes a C&I solar band of ₹24,000–32,000 per kW excluding GST on its solar EPC page. Multiplying by 50 kW gives the range below. Larger plants are priced toward the lower end of the band, so a 50 kW plant should be expected nearer the middle or upper part. Treat every figure as indicative until a site survey.

What pushes the price up: a long cable route, a tilted structure on a flat roof, roof strengthening, a separate HT or LT panel and metering works. What brings it down: a clear shadow-free roof close to the main panel and a plain sheet roof. Run your own numbers in the solar calculator and read the payback calculator for the savings side.

Roof and area

As a planning rule, rooftop solar needs about 100 sq ft per kW, so a 50 kW plant needs about 5,000 sq ft of usable, shadow-free area. Usable means no shadow from parapets, water tanks, chimneys or neighbouring buildings during the main generation hours, and clear access for installation and cleaning. A tilted layout on a flat roof needs more area than flush mounting on a metal sheet roof, because rows must be spaced to avoid shading each other.

Check what the roof can carry. Modules and structure add weight, and an old asbestos or light sheet roof may need strengthening. Use the solar plant area calculator and the roof load calculator before you decide.

Generation and what it means for your bill

A planning figure for north India is about 120 units per kW per month, or about 6,000 units a month from 50 kW. Actual generation changes with season, tilt, soiling and shading. Compare it against your daytime consumption. If your factory consumes more than 6,000 units in daytime hours, nearly all solar energy is used on site; if it consumes less, the export is credited under the net-metering rules.

Multiply the units by the energy rate on your bill to see the saving, then divide the plant cost by the annual saving for a simple payback. The solar generation calculator helps you test assumptions.

Connection, inverters and the approval sequence

A 50 kW plant normally connects at LT. The DISCOM checks that the transformer and the feeder serving you can take the plant, and that the plant size is within your sanctioned load and the net-metering rules of your state. Check our sanctioned load calculator to see how your load compares.

On inverters, a plant of this size is typically built with one or two string inverters, which keeps the design simple and limits the loss if one unit trips. See string versus central inverters.

• Feasibility check with the DISCOM.
• Application, with single-line diagram and equipment data sheets.
• Procurement and installation.
• DISCOM inspection and meter installation.
• Commissioning and start of net metering.

Timeline and how it compares with larger plants

Installation of a 50 kW plant can finish in a few weeks once material is on site. Approvals and metering usually take longer, and the time varies by DISCOM, so a realistic total from order to net metering is a few months. Ask for a schedule that separates installation from approvals.

If you are weighing sizes, compare with the published pages for 100 kW, 250 kW, 500 kW and 1 MW. A larger plant has a lower cost per kW but needs more roof, a stronger approval file and often HT works. Size to your daytime load, not to the biggest roof.

What a 50 kW quotation should list

• Module make, rated wattage and number of modules, so a 50 kW DC plant is traceable to a module count.
• Inverter make, rating and number of units, and the DC to AC ratio.
• Structure material, coating and wind design basis.
• Cable sizes and route length for DC and AC, with earthing and lightning protection.
• Who files the DISCOM application, who pays fees and who arranges the meter.
• Monitoring, cleaning and year-one maintenance.
• Payment milestones and the warranty terms for modules and inverters.

Compare quotations on that list rather than on the total. Our guide to evaluating solar EPC proposals shows how to line up bidders, and the quotation comparison calculator keeps the items side by side.

Is 50 kW the right size for you?

Size to your daytime load and your roof, not to the price per kW. A plant sized above your daytime use leans on export credit, and that credit depends on the state's rules and your DISCOM's practice. A plant sized well below your roof leaves savings on the table if your daytime use is higher. If your bill shows daytime use far above 6,000 units a month, ask for a design at 100 kW and compare; if it shows far less, ask what a smaller plant would cost and how the per-kW rate changes. A site survey settles it.

How Secured Engineers helps

We design and install C&I solar from 50 kW upwards and file DISCOM net-metering applications in-house. A bill and a roof photograph are enough for a first feasibility opinion. Design is done in-house, and approvals (Fire NOC, CEIG, DISCOM net-metering) are filed in-house. Mechanical, electrical, plumbing, fire and solar work can sit under one contract. We work from offices in Noida and Ludhiana, with 535+ projects across 18+ states and 89.77% repeat clients.

If you have a bill, a drawing or quotations in hand, send them and we will tell you what is missing. See solar calculator, message us on WhatsApp, call +91 70099 85817, or ask for a free quote.