Installing a solar rooftop system is one of the smartest financial and environmental decisions you can make for your home or business. But before you invest, it’s important to understand certain key facts about solar energy — how it works, what affects its performance, and what you should expect.
In this article, we’ll explore 9 essential solar facts every homeowner should know before going solar — so you can make an informed decision, avoid costly mistakes, and get the best out of your investment.
🌞 1. Solar Panels Work Best in Direct Sunlight — But Still Generate Power on Cloudy Days
Many people believe solar panels stop working during cloudy or rainy weather. That’s not true.
Solar panels work by converting visible light into electricity, so even when it’s cloudy, diffused sunlight still powers your system — though at a lower efficiency (typically 20–30% less).
For example, a 5 kW system in Bangalore can still generate around 16–18 units/day on cloudy days versus 22–24 units/day on sunny days.
✅ Tip: Choose high-efficiency monocrystalline PERC or TOPCon panels — they perform better in low-light conditions.
Learn more: EnergySage – How Do Solar Panels Work on Cloudy Days?
⚡ 2. Your Roof Direction and Tilt Angle Matter a Lot
The performance of your solar system depends heavily on how your panels are installed.
In India, the ideal roof direction is south-facing with a tilt angle of 10°–15° (for flat roofs) or matching the latitude angle (for sloped roofs).
A wrongly aligned system can reduce generation by 10–20%.
✅ Tip: Always get a site survey done by a professional to determine the best panel direction, tilt, and mounting structure before installation.
🏠 3. There Are 3 Main Types of Solar Rooftop Systems: On-Grid, Off-Grid, and Hybrid
Before buying, understand which system suits your needs:
- On-Grid System: Connected to the utility grid, allows you to earn credit via net metering. Best for urban homes with stable power supply.
- Off-Grid System: Works with batteries, ideal for rural or remote areas with frequent power cuts.
- Hybrid System: Combines both — uses grid power and batteries for backup.
✅ Example: If you live in Bangalore with reliable electricity, an on-grid system is perfect. But in rural areas with frequent outages, a hybrid system gives you energy independence.
Read detailed comparison here:
👉 On-Grid vs Off-Grid vs Hybrid Systems Explained (link to your earlier blog)
💰 4. Solar is a Long-Term Investment — Not a Short-Term Expense
Solar systems pay for themselves over time.
A well-designed system typically recovers its cost in 3–5 years and continues generating free electricity for 20+ years.
Example:
A 5 kW on-grid system costs about ₹3.5–4.5 lakh (after subsidy) and saves roughly ₹60,000–₹80,000 per year, depending on your location and consumption.
✅ Tip: Always calculate your ROI (Return on Investment) before installation.
Learn more: MNRE – Solar Rooftop Subsidy Program
⚙️ 5. Quality of Components Defines System Performance
Your system’s efficiency depends on three main components:
- Solar Panels – Convert sunlight into electricity.
- Inverter – Converts DC to AC power.
- Mounting Structure & Wiring – Ensure safety and durability.
Using cheap or low-quality parts may reduce system output and increase maintenance.
✅ Tip: Choose trusted brands like Orb Energy, Loom Solar, Tata Power Solar, or Waaree.
Make sure your panels are MNRE-approved and have BIS certification.
🔋 6. Batteries Are Optional — But Useful for Backup
If you live in a city with reliable grid supply, you don’t need batteries.
However, if you experience frequent power cuts, an off-grid or hybrid system with lithium-ion batteries ensures 24/7 power.
✅ Example: A 5 kWh lithium battery can run basic home loads (fans, lights, TV, fridge) for 5–6 hours during outages.
Learn more: Solar.com – Understanding Solar Battery Storage
🌍 7. Solar Systems Need Minimal Maintenance
Solar panels don’t have moving parts — they’re durable and require very little maintenance.
You just need to clean them every 10–15 days to remove dust and bird droppings.
✅ Tip: Use a soft cloth or water spray (avoid detergents).
Dusty panels can reduce generation by up to 5–10%.
Bonus: Most solar panels have a 25-year performance warranty, ensuring long-term reliability.
🧾 8. Government Subsidy and Net Metering Can Save You Lakhs
The Government of India provides subsidies under the PM Surya Ghar Muft Bijli Yojana, which covers up to ₹78,000 for residential rooftop systems (as of 2025).
Additionally, net metering allows you to export excess electricity to the grid and earn credit on your bill.
✅ Example: If your system generates 500 units/month and you consume 400 units, the remaining 100 units are credited — reducing next month’s bill.
Check your eligibility here:
👉 Official MNRE Portal – solarrooftop.gov.in
💡 9. Not All Roofs Are Solar-Ready
Before installation, your installer should check:
- Roof strength (to handle weight of panels & structure)
- Available shadow-free area (minimum 100 sq.ft per kW)
- Roof type (RCC, sheet roof, or tiled roof)
✅ Tip: If you have limited roof space, consider high-efficiency TOPCon modules — they generate more power per square meter.
📈 Bonus Tip: Solar Increases Your Property Value
Studies show that homes with solar installations sell faster and at higher prices because buyers value long-term energy savings.
Installing solar is not just an environmental choice — it’s a financial asset for your home.
🌞 Final Thoughts
Solar energy is clean, reliable, and profitable — but only if you understand it well before installation.
Knowing these 9 key facts helps you make the right choice, avoid common pitfalls, and maximize your energy savings for decades to come.
🤝 Need Expert Guidance?
Thank you for taking the time to read this article.
If you’re planning to install a rooftop solar system for your home or business, I’ll personally assist you with system design, sizing, and subsidy support.
📞 Contact: +91 86608 21746
📧 Email: brindavansolutions@gmail.com
🏢 Company: Brindavan Solutions, Bangalore
I’ll help you choose the right solar technology and ensure your investment delivers the best returns.
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