Solar Panel Not Generating Enough Power? 8 Causes & Fixes (2026)

Q: Does the government subsidy cover repair and maintenance?

The [PM Surya Ghar Muft Bijli Yojana](https://pmsuryaghar.gov.in) provides a capital subsidy for the *installation*. Maintenance costs are the responsibility of the homeowner. However, most reputable EPCs provide a 5-year comprehensive AMC as part of the initial contract.

Q: How often should I clean my solar panels in Delhi?

In high-pollution areas like [Ghaziabad](/solar/raj-nagar-extension) or [Okhla](/solar/lajpat-nagar), we recommend cleaning every 15 days. In cleaner residential areas, once a month is usually sufficient. ---

Published Mon Mar 30 2026 · Updated Thu Jul 02 2026

> **Quick Summary** > - **Primary Issue:** Dust and soiling (up to 25% loss) > - **Detection:** Compare daily units vs. design estimate (4 units/kW/day) > - **Common Fixes:** Professional AMC cleaning, inverter reboot, shading removal > - **Payback of Maintenance:** Usually 6-12 months through recovered generation > - **Expert Help:** Recommended for electrical faults or high-reach cleaning

You invested lakhs in a rooftop solar system to crush your electricity bills, but lately, the numbers don’t add up. Your BSES or Tata Power bill is creeping back up, and your monitoring app shows a worrying **solar generation drop**. If you feel your **solar panel is not generating enough** power compared to when it was first installed, you aren't alone.

In the dusty, high-pollution environment of Delhi NCR, solar systems face unique challenges. From the thick smog of November to the bird droppings of a humid July, several factors can cause your **solar panel low output**. At Bridgeway Power, with over 35 years of experience and 5,000+ installations, we’ve identified the 8 most common reasons why your system might be underperforming and exactly how to fix them in 2026.

## Why is My Solar Not Working Properly? (The 2026 Reality)

Solar panels are "set and forget" only to an extent. In India, environmental factors play a massive role. If your 5kW system used to generate 20-22 units a day but is now struggling to hit 15, you have a problem.

Before diving into technical faults, always check your net meter. Sometimes the panels are fine, but a billing error or a faulty meter makes it look like you aren't saving money. If the generation itself is low, read on.

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## 1. Dirty Panels: The "Silent Killer" of Generation The #1 reason for a **solar panel not generating enough** power in India is **soiling loss**. Dust, particulate matter (PM2.5), and bird droppings create a physical barrier between the sun and the silicon cells.

According to data from NREL and our own field studies in areas like Noida Extension and Rohini, **panel soiling loss can be as high as 25%** if not cleaned for just three weeks. In 2026, with construction at an all-time high in Gurgaon and Faridabad, this issue has intensified.

**The Fix:** Regular cleaning is mandatory. However, DIY cleaning often causes "calcification" (white spots) if you use hard borewell water. - **Action:** Use demineralized water or a professional solar AMC service. - **Impact:** You can recover up to 30% of your lost power instantly.

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## 2. Inverter Faults and Error Codes Your inverter is the "brain" of the system. If it’s not working perfectly, your panels could be producing DC electricity that never makes it to your home as usable AC power.

Common signs of inverter-led **solar generation drop** include: - **Red/Orange LED Lights:** Instead of a steady green. - **Error Codes:** Such as "Isolation Fault," "Grid Under Voltage," or "Over Temperature." - **Nuisance Tripping:** The inverter shuts down during the hottest part of the day to protect itself.

**The Fix:** Check the display for an error code. Often, a simple "Hard Reboot" (turning off the DC and AC breakers for 5 minutes) clears software glitches. If the error persists, contact your EPC provider.

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## 3. Shading from New Construction or Trees Solar panels are connected in "strings." If even a small portion of one panel is shaded by a neighbor's new floor, a growing peepal tree, or a newly installed water tank, the output of the *entire string* drops significantly.

In dense areas like Janakpuri or Lajpat Nagar, we often see "shadow migration." A roof that was sun-drenched in 2022 might be partially shaded in 2026 due to vertical expansion nearby.

**The Fix:** - **Tree Trimming:** Keep nearby branches clear. - **Optimizers/Microinverters:** If shading is unavoidable, upgrading to microinverters allows each panel to work independently. Learn more about string vs. microinverters.

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## 4. Degradation After 5+ Years While top-tier panels (Tier-1) are warrantied for 25 years, they do lose efficiency over time. Standard degradation is about 0.5% to 0.7% per year. However, if you bought cheap, unbranded panels five years ago, you might be seeing **solar panel low output** due to "Light Induced Degradation" (LID) or "Potential Induced Degradation" (PID).

**The Fix:** Check your original warranty documents. If the generation has dropped by more than 10-15% within the first 5-10 years, you might be eligible for a performance warranty claim under MNRE guidelines.

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## 5. Loose Wiring and Junction Box Issues India's extreme temperature fluctuations (from 5°C in winter to 48°C in summer) cause wires to expand and contract. This can lead to: - **Loose DC Connectors (MC4):** Causes arcing and power loss. - **Burnt Junction Boxes:** Water ingress during monsoons can short-circuit the bypass diodes. - **Rat Damage:** In many Delhi rooftops, rodents chew through the DC cables.

**The Fix:** A professional thermal imaging scan (included in our Solar AMC) can detect "hotspots" or loose connections that are invisible to the naked eye.

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## 6. Wrong Tilt Angle and Orientation For maximum generation in the Northern Hemisphere (India), panels should face **True South**. If your installer mounted them facing East or West to fit the roof shape, you are already losing 10-15% potential energy. Furthermore, the optimal tilt for Delhi NCR is roughly **25-28 degrees**.

**The Fix:** If your panels are on a railing or flat structure, consider re-tilting them if the seasonal loss is too high. However, this is a major structural change and requires an expert.

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## 7. How to Monitor: Is Your Generation Actually "Low"? Many homeowners think their **solar panel is not generating enough** because they compare a cloudy day in July to a clear day in March.

**Standard Math for Delhi NCR:** - **1kW System** should produce **4 units (kWh)** per day on average. - **Monthly:** ~120 units per kW. - **Annual:** ~1400-1500 units per kW.

If your 5kW system is producing 600 units a month, it's performing perfectly. If it's producing 400 units, you have a problem. Use your DISCOM app (like BSES Solar) to track exported units.

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> 🔧 **Already have solar?** Protect your investment with an Annual Maintenance Contract — panel cleaning, inverter checks & generation monitoring from ₹4,999/year. View AMC Plans →

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## 8. When to Call a Professional vs. DIY Fix **DIY Fixes:** - Cleaning panels with soft water and a squeegee. - Visual inspection for broken glass or bird nests. - Checking if the MCB (circuit breaker) has tripped.

**Professional Help Needed:** - Inverter error codes. - Any wiring/electrical issues (High voltage DC is dangerous!). - Performance auditing using professional meters. - Deep cleaning of panels that are hard to reach.

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## Table: Common Solar Generation Issues & Costs (2026)

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## Real Example: A Delhi Home Recovery A homeowner in Pitampura with a 7kW system noticed their generation had dropped from 30 units/day to just 18 units/day over two years. They suspected the panels were "old."

Upon inspection by Bridgeway Power, we found: 1. **Extreme Soiling:** A layer of cement dust from nearby construction (20% loss). 2. **One Tripped String:** A loose wire in the DCDB had disconnected 3.5kW of the system (50% loss on that string).

**The Result:** After a professional cleaning and wire tightening, the system jumped back to 29 units/day. Their ROI was restored in just one billing cycle. Read more in our Solar AMC Case Study.

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## Frequently Asked Questions

### Why is my solar panel not generating enough power on cloudy days? Solar panels require photons, not just heat. While they can generate power during overcast weather using diffused light, the output typically drops to 10-25% of their rated capacity. This is normal and not a "fault."

### Can I use a pressure washer to clean my solar panels? No. High-pressure water can force its way into the panel's seals or cause micro-cracks in the cells. Use a low-pressure hose and a soft brush or specialized cleaning robot.

### Does the government subsidy cover repair and maintenance? The PM Surya Ghar Muft Bijli Yojana provides a capital subsidy for the *installation*. Maintenance costs are the responsibility of the homeowner. However, most reputable EPCs provide a 5-year comprehensive AMC as part of the initial contract.

### What should I do if my inverter shows "Isolation Fault"? This usually means there is a "leakage" of current to the ground, often caused by damaged wire insulation or moisture in the junction box. Turn off the system and call a technician immediately, as this can be a fire hazard.

### How often should I clean my solar panels in Delhi? In high-pollution areas like Ghaziabad or Okhla, we recommend cleaning every 15 days. In cleaner residential areas, once a month is usually sufficient.

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## Conclusion: Don't Let Dirty Panels Steal Your ROI A solar system is a 25-year asset, but it requires basic hygiene to deliver the promised savings. If you're struggling with **solar panel low output**, don't wait for your next high electricity bill to take action.

Whether it’s a simple cleaning or a complex inverter repair, Bridgeway Power is here to help. We offer professional AMC services across Delhi NCR to ensure your "Free Electricity" stays truly free.

**Ready to boost your generation?** Book a Free Solar Health Checkup with Bridgeway Power today! or use our Solar Calculator to see if your current generation matches your potential.