What an 80 kW Solar Plant Costs and Needs: Roof, Connection, Approvals

An 80 kW solar plant costs ₹19.2–25.6 lakh excluding GST across the published Secured Engineers band of ₹24,000–32,000 per kW, and plants this small usually sit in the upper half of it. It needs about 8,000 sq ft of shadow-free roof, generates about 9,600 units a month in north India, normally connects at LT, and needs a DISCOM net-metering approval.

What 80 kW needs, at a glance

Treat every figure as indicative until a survey. Smaller plants cost more per kW because fixed costs (design, approvals, a panel, monitoring, mobilisation) are spread over fewer kilowatts. That is why the band applies from its upper half here, and why the 100 kW page quotes ₹28,000–32,000 per kW. What pushes you up within the range: a long cable route to the main panel, a tilted structure on a flat RCC roof, roof strengthening on old sheets, and a separate meter room. What brings you down: a clear sheet roof close to the panel.

Why 80 kW sits just under the 100 kW class

Many DISCOMs and commissions use size bands in fees, forms and technical checks. As one example, the Tamil Nadu regulations of 2021 set registration fees for LT plants in steps at 20 kW and 150 kW, and begin gross metering at 151 kW. Other states draw their own lines. An 80 kW plant therefore typically falls in the same band as a 100 kW plant, but it is worth checking whether your DISCOM has a threshold at 50 kW, 75 kW or 100 kW, because a plant sized to the line can change the form, the fee, the inspection or the voltage level at which you connect. Confirm your DISCOM's table before you fix the size. Our guides to the 100 kW plant and the 50 kW plant show the neighbouring sizes.

LT or HT: how the connection decision works

At 80 kW the plant is almost always connected on the LT side. If your factory has an LT service, the plant connects to your main LT panel through its own breaker. If you have an HT service with your own transformer, the plant still usually connects at the LT bus behind the transformer, and the DISCOM checks the transformer's loading and your contract demand. Three checks decide feasibility:

• Sanctioned load or contract demand. Most state rules cap the plant against it. Test your headroom with the sanctioned load calculator.
• Transformer loading. The DISCOM looks at the distribution transformer serving you and the other solar already connected to it.
• Daytime load. The plant should be sized to what you use between about 8 am and 5 pm, so that most units are consumed on site.

Inverters, layout and generation

Two to four string inverters keep the design simple and limit the loss if one trips. A central inverter is not economic at this size. Match the total inverter AC rating to the capacity your DISCOM will approve, because some states reckon plant capacity on the AC side and pay or credit nothing above it. The DC array can be a little larger than the AC rating, but ask the designer what that does to clipping in the middle of the day.

The planning figure is 120 units per kW per month in north India, so 9,600 units from 80 kW, with winter lower and summer higher. If a blended energy cost of ₹9 per unit is used, as on our 100 kW page, the avoided purchase is about ₹86,000 a month, but your own tariff and your daytime share change the result. Divide the plant cost by your annual saving for a simple payback, then test it in the payback calculator. The solar calculator takes your bill and your roof to a first estimate.

Approvals and a realistic timeline

1. Feasibility with the DISCOM. The Electricity (Rights of Consumers) Rules, 2020, as originally notified, ask the licensee to complete a technical feasibility study within the time set by the state commission, not exceeding 20 days.
2. Application with the single-line diagram, datasheets and fee.
3. Procurement and installation. Typically a few weeks of site work on a structurally ready roof.
4. Installation certificate, inspection, meter and agreement. The same rules ask for the connection agreement, meter and commissioning within not more than 30 days of the installation certificate, with compensation to the consumer of not less than ₹500 per day for the licensee's unjustified delay. Later amendments changed some of these provisions, so read the current text and your state's regulation.
5. Commissioning and the start of net metering.

Realistically, plan for a few months from order to net metering, and ask for a schedule that separates installation from approvals. Module approved-list rules also affect which modules you may fit at commissioning; see our notes on the approved list and check the current MNRE order.

Is 80 kW the right size for you?

Size to your daytime load and your sanctioned load, not to the roof or to a round number. If your twelve-month bills show daytime consumption well above 9,600 units a month, 80 kW will be fully used on site and a larger plant may be worth a quote, up to what the sanctioned load and the roof allow. If daytime use is well below that, the surplus is exported, and its value depends on your state's rules and the DISCOM's practice, so a smaller plant may pay back faster per rupee spent. Check the roof as well as the bill: sheet condition, shading from tanks and chimneys, and a route for the cables.

When you collect quotations, ask each bidder to list the module make and wattage and the module count, the inverter make and rating, the structure material and coating, the cable sizes and route length, who files the DISCOM application and who pays the fees, the monitoring system, cleaning and year-one maintenance, the payment milestones, and the warranty terms. Compare on that list, not on the total. Our guide to comparing solar EPC quotes applies at this size too.

How Secured Engineers helps

We design and install C&I solar plants from 50 kW upwards. Design is done in-house, and Fire NOC, CEIG and DISCOM net-metering applications are filed in-house, so the single-line diagram, the DISCOM file and the inspector's file come from one team. Mechanical, electrical, plumbing, fire and solar work can sit under one contract, which helps when the roof also carries HVAC or fire-fighting equipment. We work from offices in Noida (Delhi NCR) and Ludhiana, with 535+ projects across 18+ states and 89.77% repeat clients.

A twelve-month bill, your sanctioned load and a roof photograph are enough for a first feasibility opinion on whether 80 kW is the right size. Start with the solar calculator, message us on WhatsApp, call +91 70099 85817, or ask for a free proposal. See also our solar EPC service.