Solar Panel for Shop in India (2026): Cost, System Size, ROI & DISCOM Approval Guide for Commercial Use

Why Every Indian Shopkeeper Should Go Solar in 2026

India has over 70 million registered commercial establishments, ranging from small kirana stores to large retail showrooms, restaurants, warehouses, and office spaces. These businesses collectively consume over 20 percent of India's total electricity, with commercial electricity tariffs being among the highest in the country — ₹8 to ₹14 per kWh in most states, compared to ₹3 to ₹8 for residential consumers.

This high tariff structure creates a compelling economic case for rooftop solar. A commercial shop paying ₹10 per kWh can recover its solar investment in just 3 to 4 years and enjoy 20+ years of virtually free electricity thereafter. This guide by Er. Dhramveer Joshi provides a complete roadmap for Indian shopkeepers to evaluate, install, and benefit from rooftop solar.

Understanding Commercial Electricity Tariffs

Before sizing a solar system, it is essential to understand the commercial electricity tariff structure in your state, as this directly determines your savings and ROI. Unlike residential tariffs (which are often subsidised and slab-based), commercial tariffs are typically flat or two-part structures:

Energy Charge: A flat rate per kWh consumed. Ranges from ₹7 to ₹12 per kWh for low-tension (LT) commercial connections. Some states apply time-of-day (TOD) pricing where afternoon peak hours are charged 20 to 30 percent more than off-peak hours — this is advantageous for solar since peak generation coincides with peak pricing.

Demand Charge: A fixed charge per kVA of contract demand, typically ₹200 to ₹500 per kVA per month. This charge applies regardless of actual consumption and is not reduced by solar generation (since solar does not reduce your contract demand).

Fuel Surcharge and Other Levies: Additional charges for fuel cost adjustments, electricity duty, and wheeling charges that add 10 to 15 percent to the base energy charge.

Effective Tariff: When all charges are included, the effective commercial tariff in most states ranges from ₹9 to ₹15 per kWh. Every kWh of solar self-consumption saves you this full amount.

System Sizing for Different Shop Types

Sizing a commercial solar system requires a careful analysis of your electricity consumption pattern, rooftop area, and structural capacity. Here are sizing guidelines for common commercial establishment types:

Small Retail Shop (Kirana Store, Pharmacy, Mobile Shop)

Monthly consumption: ~305 kWh. Recommended system: 2 kW (generates ~280 kWh/month). Roof area needed: 15–20 sq ft.

Medium Shop with AC (Garment Store, Electronics, Clinic)

Monthly consumption: ~1,230 kWh. Recommended system: 7–8 kW. Roof area needed: 550–650 sq ft.

Large Showroom / Restaurant (Multi-Floor, Heavy HVAC)

Monthly consumption: ~4,160 kWh. Recommended system: 20–25 kW. Roof area needed: 1,800–2,200 sq ft.

Cost Breakdown for Commercial Solar Installation

Commercial solar installations are priced differently from residential systems due to the absence of the PM Surya Ghar subsidy (for most commercial connections), the need for three-phase inverters on larger systems, and additional electrical protection requirements.

Note: Commercial systems above 10 kW benefit from significant economies of scale, with per-watt costs dropping by 10 to 15 percent compared to smaller residential-scale systems.

ROI Calculation for a 5 kW Commercial System

Let us calculate the complete financial return for a 5 kW system installed on a medium-sized shop in Haryana paying the DHBVN commercial tariff.

System Cost: ₹2,36,000 (no government subsidy for commercial connection).

Annual Generation: 5 kW × 4.5 kWh/kWp/day × 365 = 8,213 kWh.

Self-Consumption (80%): 6,570 kWh × ₹10.00/kWh = ₹65,700 saved.

Net Metering Export (20%): 1,643 kWh × ₹3.00/kWh = ₹4,929 credited.

Total Annual Benefit: ₹65,700 + ₹4,929 = ₹70,629.

Accelerated Depreciation Benefit (Year 1): 40% × ₹2,36,000 × 30% tax rate = ₹28,320.

Simple Payback Period: ₹2,36,000 ÷ ₹70,629 = 3.3 years.

Effective Payback (with depreciation): (₹2,36,000 − ₹28,320) ÷ ₹70,629 = 2.9 years.

25-Year Lifetime Savings: ₹70,629 × 25 (with 5% annual tariff escalation) ≈ ₹33,67,000.

DISCOM Approval Process for Commercial Solar

The DISCOM approval process for commercial connections is similar to residential but involves additional requirements:

• Load Study: For systems above 10 kW, the DISCOM may require a load flow study to assess the impact of solar injection on the local distribution network. This study evaluates voltage rise, reverse power flow, and protection coordination.
• Three-Phase Requirement: Commercial systems above 5 kW typically require a three-phase connection and a three-phase inverter. If your shop has a single-phase connection, you may need to upgrade to three-phase before installing solar.
• Structural Certification: For rooftop installations on commercial buildings, some DISCOMs require a structural engineer's certificate confirming that the roof can support the additional load of the solar array (typically 15 to 20 kg per panel plus mounting structure).
• Fire Safety Clearance: For installations in commercial complexes, malls, or multi-tenant buildings, fire safety clearance from the local fire department may be required, particularly for systems with battery storage.

Financing Options for Shopkeepers

Several financing options are available to make solar affordable for commercial establishments:

• Solar Loans: Banks including SBI, PNB, and Bank of Baroda offer dedicated solar loans at concessional interest rates of 7 to 9 percent for terms up to 7 years. The monthly EMI for a ₹2,36,000 loan at 8 percent for 5 years is approximately ₹4,786, which is less than the monthly savings of ₹5,886.
• OPEX/PPA Model: Third-party developers install and maintain the system at zero upfront cost. The shopkeeper pays a fixed per-unit rate (₹4 to ₹6/kWh) for the solar electricity consumed, which is still 30 to 50 percent less than the commercial grid tariff. The developer retains ownership of the system.
• Equipment Leasing: Some NBFCs offer solar equipment leasing with monthly payments that are structured to be less than the electricity savings, making the system cash-flow positive from Day 1.

Expert Advisory by Er. Dhramveer Joshi

For shopkeepers, rooftop solar is not just an environmental choice — it is a sound business investment with returns that exceed most financial instruments. The higher commercial tariff accelerates ROI to under 4 years, and the accelerated depreciation benefit provides an immediate tax shield. My advice to every shopkeeper is to start with a system sized to offset 80 percent of your daytime consumption, verify the DISCOM commercial net metering rules in your state, and negotiate an AMC with your installer for at least the first five years. The investment will pay for itself several times over during the system's 25-year operational life.