10kW Rooftop Solar System Sizing & Application
A 10kW rooftop solar power system is designed for high-consumption residential villas, joint family properties, commercial offices, private hospitals, schools, hotels, and industrial establishments across Assam. If your monthly electricity bill exceeds ₹8,000 to ₹15,000, a 10kW solar installation provides significant financial returns and long-term energy independence.
10kW Solar Cost & Commercial Financial Highlights
For commercial connections (shops, offices, institutions), solar power is treated as a business capital asset, unlocking attractive tax benefits alongside direct electricity bill reduction.
| Metric | Residential 10kW System | Commercial / Industrial 10kW System |
|---|---|---|
| System Cost Range | ₹5,50,000 – ₹6,20,000 | ₹5,20,000 – ₹6,00,000 (Bulk commercial components) |
| Subsidy Eligibility | Subsidy capped at 3kW rate (₹1,30,800 max under PM Surya Ghar) | Not eligible for residential subsidy; eligible for Tax Benefits |
| Income Tax Depreciation | N/A | 40% Accelerated Depreciation in Year 1 |
| Monthly Energy Generation | 1,000 to 1,300 units (kWh) per month | 1,000 to 1,300 units (kWh) per month |
| Monthly Financial Savings | ₹7,500 – ₹11,000 per month | ₹9,000 – ₹13,000 per month (higher commercial tariff offset) |
| Payback Timeline | Approximately 4 to 4.5 years | Approximately 3 to 3.5 years (including tax benefit) |
APDCL 3-Phase Net Metering Requirements for 10kW
Systems of 10kW capacity require a 3-phase electrical connection under APDCL regulations. Key connection guidelines include:
- Sanctioned Load Extension: Your APDCL sanctioned load must be upgraded to 10kW or higher prior to commissioning. Solar Assam handles load enhancement filings on the APDCL portal.
- Transformer Capacity Verification: APDCL rules stipulate that total connected solar capacity on a local distribution transformer cannot exceed 75% to 80% of transformer capacity. Early submission ensures transformer quota allocation.
- 3-Phase Grid-Tied Inverter: Utilizes advanced 3-phase string inverters (Growatt, Sungrow, or Solis) with active power filtering and grid feedback synchronization.
Roof Space & Heavy-Duty Structure Design
A 10kW installation requires **800 to 1,000 square feet** of unshaded rooftop area. For commercial rooftops, elevated super-structures can be erected 7 to 8 feet above the terrace level, preserving the roof area beneath for recreational or utility use.