Solar panel photovoltaic (PV) cells se bana hota hai jo sunlight ko directly electricity mein convert karta hai. Jab sunlight panel pe padti hai, electrons move karte hain aur DC electricity produce hoti hai. Phir inverter se DC ko AC mein convert kiya jaata hai jo ghar mein use hoti hai.

On-grid system seedha electricity grid se connected hota hai — bijli banao aur grid ko bhejo, bill kam hota hai. Off-grid system bilkul alag hota hai — battery mein store hoti hai, grid ki zaroorat nahi. Hybrid dono ka combination hai — grid bhi hai aur battery backup bhi, power cut mein bhi kaam karta hai.

Haan, kaam karta hai! Cloudy weather mein efficiency 10–25% tak kam ho jaati hai lekin panels band nahi hote. Diffused sunlight bhi kafi hoti hai. Sirf raat ko panels kaam nahi karte — isliye battery ya grid connection zaroori hota hai.

Monthly units ÷ 30 ÷ peak sun hours = kW needed. Example: 300 units/month → 300 ÷ 30 ÷ 5 = 2 kW system. Chhote ghar ke liye 1–3 kW, medium ke liye 3–5 kW, aur bade ghar ya dukaan ke liye 5–10 kW+ suitable hota hai.

Approximate cost in India: 1 kW = ₹50,000–₹70,000 (installation included). 3 kW system ≈ ₹1.5–2 lakh, 5 kW ≈ ₹2.5–3.5 lakh. Ye quality aur brand ke hisaab se vary karta hai. Govt subsidy milne ke baad cost aur kam ho jaati hai.

Typically 4–6 saal mein payback milta hai. Agar monthly bill ₹3,000 hai aur 5 kW system lagaya ₹2.5 lakh mein, toh approx 7 saal mein pura recover ho jaata hai. Uske baad 20+ saal free bijli! Electricity rate badhne se ROI aur better hoti hai.

PM Surya Ghar Yojana ke under: 1–2 kW system pe ₹30,000 per kW (max ₹60,000), 2–3 kW pe ₹18,000 per kW additional. Maximum subsidy ₹78,000 tak mil sakti hai residential customers ko. Subsidy direct bank account mein aati hai.

Haan! SBI, Bank of Baroda, HDFC Green Loan aur kai NBFCs solar loans dete hain — typically 7–12% interest pe 5–7 saal ke liye. Kai companies 0% EMI bhi offer karti hain. Monthly EMI aksar electricity bill se kam hoti hai, isliye day 1 se savings shuru.

Residential system (1–10 kW) ki installation typically 1–2 din mein complete hoti hai. Isme site survey, panel mounting, wiring aur inverter installation shaamil hai. Govt approval aur net meter lagwane mein 2–4 hafte extra lag sakte hain.

1 kW solar system ke liye approx 80–100 sq ft shadow-free chhati chahiye. 5 kW ke liye 400–500 sq ft. Chhati ka angle aur direction (south-facing best hota hai India mein) bhi matter karta hai.

Society flat mein individual solar lagana mushkil hota hai — society ki permission chahiye. Lekin society collectively rooftop solar laga sakti hai aur bill savings share kar sakti hai. Rent wali property mein owner ki written permission zaroori hai.

Net metering mein meter dono direction mein measure karta hai — extra bijli DISCOM ko bhejo aur bill mein credit pao. Apply ke liye DISCOM portal pe register karo, installation certificate submit karo, phir bidirectional meter lagega. Process state ke hisaab se vary karta hai.

Solar panels very low maintenance hote hain. Bas regular cleaning chahiye — dust aur bird droppings performance 15–25% kam kar sakte hain. Month mein 1–2 baar plain water se soft cloth se saaf karo. Panels ki warranty 25 saal hoti hai.

Quality solar panels ki lifespan 25–30 saal hoti hai. Performance guarantee: pehle 10 saal 90% output, phir 25 saal tak 80% output. Inverter ki life shorter hoti hai — typically 10–15 saal.

Quality panels IP65/IP67 rated hote hain — fully waterproof aur dustproof. IEC certified panels 130–170 km/h wind speed tak safe hain. Proper installation (certified mounting structure) ke baad normal weather events mein koi problem nahi aati.

Modern inverters WiFi se connected hote hain aur mobile app se real-time monitoring hoti hai — daily/monthly production, consumption, grid export, system health sab dikhta hai. SolarEdge, Huawei, Fronius ke apps bahut detailed data dete hain. Problem pe alerts bhi aate hain.

On-grid system mein battery optional hai — sirf frequent power cuts wale areas mein helpful hai. Off-grid system mein battery mandatory hai. Battery cost ₹30,000–₹1,00,000+ hoti hai capacity ke hisaab se. Lithium batteries better hain lead-acid se.

5 kWh battery se: sirf lights + fans = 8–10 ghante, TV + fridge = 4–6 ghante, AC bhi chalao = 1–2 ghante. Normal ghar ke liye 5–10 kWh battery sufficient hoti hai power cuts ke liye.

Lithium: 3,000–5,000 charge cycles, 10+ saal life, light weight, fast charging, 95%+ efficiency — lekin expensive (2–3x cost). Lead-acid: 500–1,000 cycles, 3–5 saal life, heavy, 80% efficiency — lekin sasta. Long term mein lithium zyada value for money hai.