Frequently Asked Questions — Solar Energy in Tamil Nadu
How much does solar installation cost in Tamil Nadu?
After PM Surya Ghar subsidy: Residential (1–10kW): ₹50,000–60,000 per kW. Commercial (10–100kW): ₹45,000–50,000 per kW. Industrial (100kW+): ₹40,000–45,000 per kW. Use our free solar calculator for a personalized estimate.
What is the PM Surya Ghar Yojana subsidy amount?
PM Surya Ghar provides ₹30,000/kW for systems up to 2kW, ₹18,000/kW for 2–3kW systems, and a fixed ₹78,000 for systems above 3kW. Tristar is an approved vendor and handles the full application process.
How long does solar installation take?
Residential installations take 1–2 days on-site. The complete process including TANGEDCO net metering approval takes 2–4 weeks. We handle all paperwork.
What is the difference between on-grid, off-grid, and hybrid solar?
On-grid: connected to TANGEDCO grid, earns net metering credits, lowest cost. Off-grid: battery-based, fully independent, ideal for remote areas. Hybrid: grid-connected with battery backup for outage protection.
What is the payback period for solar in Tamil Nadu?
Residential systems with net metering: 4–5 years. Commercial systems: 3–4 years. After payback, enjoy virtually free electricity for 20+ years.
Do solar panels work during Tamil Nadu monsoon season?
Yes — panels generate power even on cloudy days, typically at 10–25% capacity. Tamil Nadu's 300+ annual sunny days ensure strong yearly generation despite monsoon. Most homes still see 70–90% electricity bill reduction annually.
How many units does a 3kW solar system generate per month in Tamil Nadu?
A 3kW solar system in Tamil Nadu generates approximately 360-400 units per month (12-13 units per day), based on the state's average solar irradiance of 4.5-5.5 kWh/m2/day. This is enough to offset a monthly electricity bill of Rs 2,000-3,000.
What is the cost of a 5kW solar system in Tamil Nadu after subsidy?
A 5kW on-grid solar system in Tamil Nadu costs approximately Rs 2,20,000-2,60,000 before subsidy. After the PM Surya Ghar subsidy of Rs 78,000, the net cost is Rs 1,42,000-1,82,000. The system generates 600-650 units per month and pays for itself in 3-4 years.
Is Tristar Green Energy Solutions MNRE approved?
Yes, Tristar Green Energy Solutions is MNRE approved, TEDA registered, and TANGEDCO empanelled. This triple authorization means customers qualify for PM Surya Ghar subsidies and streamlined net metering approvals.
How long does TANGEDCO net metering approval take?
TANGEDCO net metering approval typically takes 30-45 days with an experienced vendor. The process includes feasibility approval (15-20 days), installation and inspection, and meter change. Tristar handles all TANGEDCO paperwork and liaison.
What is the difference between DCR and non-DCR solar panels?
DCR (Domestic Content Requirement) panels have both solar cells and modules manufactured in India. Only DCR panels listed on MNRE's ALMM (Approved List of Models and Manufacturers) qualify for PM Surya Ghar subsidy. Non-DCR panels use imported cells and do not qualify for government subsidies.
Can I install solar on my apartment rooftop in Tamil Nadu?
Yes, apartment societies can install solar on common terraces. TANGEDCO allows group net metering where solar credits are shared among flat owners. The housing society needs a committee resolution, and the system is installed on the common terrace with credits allocated proportionally.
What happens to solar panels during Tamil Nadu monsoon?
Solar panels generate 10-25% of rated capacity during monsoon. Tamil Nadu's northeast monsoon (October-December) has the most impact. Annual generation is still 70-90% of optimal because Tamil Nadu receives 300+ sunny days per year. Net metering credits accumulated during sunny months offset monsoon production.
Does solar installation increase property value in Tamil Nadu?
Yes, solar installations typically increase property value by 3-5% in Tamil Nadu. A Rs 2 lakh solar system can add Rs 5-8 lakh to property value. The transferable net metering connection and reduced electricity bills make solar homes more attractive to buyers.
What is accelerated depreciation benefit for commercial solar?
Businesses can claim 40% accelerated depreciation on solar systems under Section 32 of the Income Tax Act. For a Rs 45 lakh, 100kW system, this means Rs 18 lakh depreciation in Year 1, saving Rs 5.4 lakh in taxes at 30% tax rate. This reduces effective payback from 4 years to 2.5 years.
Which solar inverter brand is best for Tamil Nadu climate?
For Tamil Nadu's hot climate, choose inverters with wide temperature operating range. Top brands: Fronius (premium, 10-year warranty), Growatt (value, fan-cooled), Enphase micro-inverters (no moving parts, 25-year warranty). For shaded rooftops, micro-inverters outperform string inverters.
How to check PM Surya Ghar subsidy application status?
Visit pmsuryaghar.gov.in and log in with your registered mobile number. Go to 'Track Application' to see current status. The stages are: Application Submitted, Feasibility Approved, Installation Verified, Net Metering Commissioned, Subsidy Disbursed. Typical timeline is 3-6 months from application to subsidy credit.
What is the electricity bill after installing solar in Tamil Nadu?
Most Tamil Nadu homeowners see 70-90% reduction in TANGEDCO bills after solar installation. A household consuming 500 units/month typically sees bills drop from Rs 3,500-4,000 to Rs 200-500 (minimum charges only). With net metering, excess generation is credited to future bills.
Is solar worth it in 2026 in Tamil Nadu?
Yes, solar is highly worth it in Tamil Nadu in 2026. With PM Surya Ghar subsidy of up to Rs 78,000, TANGEDCO tariffs rising 3-5% annually, and system costs at historic lows, the payback period is just 3-4 years. Solar provides free electricity for 20+ years after payback, with a typical 25-year savings of Rs 8-10 lakh for a 3kW residential system.
What size solar system do I need for my home in Tamil Nadu?
System size depends on your monthly electricity consumption. For 200 units/month: 2kW system. For 300-400 units/month: 3kW system. For 500+ units/month: 5kW system. Use the free solar calculator for a personalized recommendation based on your TANGEDCO bill amount.
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