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As the global solar industry races toward higher efficiency and better performance, Back Contact (BC) solar modules are emerging as one of the most promising technologies for the next wave of innovation. Designed to eliminate front-side metal contacts, BC modules offer superior light absorption, improved reliability, and better aesthetics — all while pushing the limits of power conversion efficiency.

In this blog, we’ll explore:

  • What BC modules are

  • How they work

  • Types of BC technologies

  • Benefits vs. conventional modules (like PERC & TOPCon)

  • Why BC modules are the future of solar PV


🔍 What Are Back Contact (BC) Solar Modules?

Back Contact (BC) solar modules are photovoltaic panels in which all the electrical contacts — both positive and negative — are located on the rear side of the solar cell. This contrasts with most conventional technologies, where metallic contacts are present on the front, partially shading the light-absorbing surface.

By moving all the contacts to the back, BC modules eliminate front-side shading losses and optimize light capture, resulting in higher efficiency and sleek, black-panel aesthetics.


⚙️ How Do BC Modules Work?

  1. Light Absorption (Front Side):

  2. Charge Generation & Separation:

  3. Rear Contact Collection:

  4. Power Extraction:


🧬 Types of Back Contact Technologies

BC is a category, and it includes several specific designs, such as:

IBC (Interdigitated Back Contact):- Uses alternating p-type and n-type fingers on the rear (Maxeon)

HPBC (Hybrid Passivated Back Contact):- Combines rear passivation and BC layout (Longi)

ABC (All Back Contact):-All contacts on the back, simplified design(Aiko Solar)

Poly-ZEBRA:- A hybrid of TOPCon & BC developed by ISC Konstanz (SPIC / ISC)


✅ Why BC Modules Are Better: Key Advantages

1. No Front-Side Shading = Higher Efficiency

  • Conventional cells lose 3–5% of sunlight due to metal fingers on the front.

  • BC modules eliminate this loss entirely, offering higher conversion efficiency — up to 26–27% in labs and 24–26% in commercial modules.

2. Improved Performance in Harsh Conditions

  • BC modules resist overheating during partial shading, unlike TOPCon or PERC.

  • Real-world tests (like Longi’s “egg-frying” experiment) show that BC modules prevent dangerous hotspots.

  • They perform better in extreme heat, enhancing long-term reliability.

3. Superior Aesthetics

  • The all-black appearance with no visible gridlines is ideal for residential rooftops, façades, and building-integrated photovoltaics (BIPV).

4. High Bifacial Potential

  • Despite concerns, modern BC designs can achieve a bifaciality factor ~0.8, nearly equal to TOPCon.

  • This means they can also harvest light from the rear, increasing output in bifacial applications.

5. Better Internal Quantum Efficiency (IQE)

  • Rear-side emitter structures in BC modules help achieve higher IQE, especially in the red/infrared part of the spectrum.


💸 What About Cost?

  • Historically, BC modules were more expensive due to manufacturing complexity.

  • As of 2025, they are still 15–30% costlier than TOPCon modules.

  • However, that cost gap is rapidly shrinking due to:

  • By 2028, BC modules are expected to reach cost parity with TOPCon — with better performance.


📈 The Road Ahead

  • According to experts like Radovan Kopecek (ISC Konstanz):

China is expected to lead the transition, followed by India, then Europe and the U.S.


🧠 Final Thoughts: BC = The Future of High-Performance Solar

Back Contact technology is not just an upgrade — it represents a fundamental redesign of how solar modules convert sunlight to electricity. With superior efficiency, sleek aesthetics, better heat resistance, and growing affordability, BC modules are becoming the go-to choice for future-focused solar manufacturers.


Whether for utility-scale plants or high-end rooftops, BC is the next-gen solar solution — ready to redefine what's possible in PV.

🔗 Want to learn more about specific BC module manufacturers or need help choosing between TOPCon and BC for your next project? Let’s connect and explore the best fit for your application.

 
 
 

Looking for Rajasthan solar subsidy details? Great news! Homeowners in Rajasthan can now avail a solar subsidy of up to ₹95,000 under the PM Surya Ghar Muft Bijli Yojana, making rooftop solar more affordable than ever before. If you’re planning to cut your electricity bills and adopt green energy, this is the golden opportunity you’ve been waiting for!


💸 Subsidy Breakdown: How Do You Get ₹95,000?

The total Rajasthan solar subsidy is a combination of Central and State Government incentives:

  • ₹78,000 – Central Financial Assistance under PM Surya Ghar Yojana

  • ₹17,000 – Rajasthan State Government subsidy under the 150 free unit scheme

Total Benefit: ₹95,000 off on your rooftop solar installation!

With this subsidy, installing a 1.1 kW solar system in Rajasthan can be virtually free of cost! Bigger systems also get massive discounts, making it the perfect time to go solar.


🏡 Who is Eligible for ₹95,000 Solar Subsidy in Rajasthan?

To avail the full ₹95,000 subsidy, you need to:

  • Be a residential consumer in Rajasthan

  • Registered user under the 100 free units electricity scheme (Mukhyamatri Nishulk Bijli Yojana)

  • Install a rooftop solar system under PM Surya Ghar Yojana

Even if you’re not under the 100-unit scheme, you can still get the ₹78,000 CFA subsidy – which still results in massive savings!


⚡ Why You Should Install Solar Now

1️⃣ ₹95,000 Subsidy – Limited Time Offer

Government schemes change – grab this unmatched financial support while it lasts!

2️⃣ Protection from Rising Electricity Bills

Generate your own power and save up to ₹50,000 per year for the next 25 years.

3️⃣ Retain Free Electricity Benefits

Households using above 150 units/month must install solar to continue receiving free units.

4️⃣ Environmentally Friendly

Switch to clean, green energy and reduce your carbon footprint.


✔ What’s the Next Step?

  • ✅ Check Your Eligibility – Make sure you’re enrolled under the 100-unit scheme.

  • ✅ Contact a Reliable Solar Installer – Choose an MNRE-registered vendor.

  • ✅ Apply Online for Subsidy – Most solar companies help with the process.

  • ✅ Enjoy Free Electricity for Decades – Reap the benefits of solar power with zero fuel cost.


🌞 Final Words

The ₹95,000 Rajasthan solar subsidy under the PM Surya Ghar Yojana is a game-changing initiative that makes rooftop solar highly affordable. Whether you're looking to reduce electricity bills or adopt a sustainable lifestyle, this scheme offers the perfect push.

Don’t wait – install solar and secure your free electricity future today!

Call:- 8299519741




 
 
 

Rajasthan has introduced an innovative model to promote large-scale solar installations in urban and rural areas. The scheme ensures that domestic consumers who consume more than 150 units of electricity receive benefits under the Chief Minister's Free Electricity Scheme—but only if they install solar plants on their rooftops. This strategic move aligns with the PM Surya Ghar Yojana and aims to enhance solar energy adoption across the state.


Understanding the Three Implementation Models

To execute this initiative effectively, the Rajasthan government has devised three models:


Model 1: Individual Rooftop Solar System

  1. Mandatory Installation for Free Electricity

    • Consumers who use more than 150 units must install a solar rooftop system to continue availing the CM Free Electricity Scheme benefits.

  2. Government-Supported Installation

    • The state government will install a 1.1 kW solar plant for free on eligible consumers’ rooftops.

    • Consumers will receive 150 units of free electricity monthly.

  3. Impact of Not Installing Solar

    • Consumers will lose their existing free electricity benefits if they do not opt for rooftop solar installation.

  4. Subsidy & Financing Provisions

    • The installation cost (excluding metering) is ₹50,000 per system.

    • ₹33,000 subsidy from the Central Government and ₹17,000 from the State Government will be provided.

    • Consumers who wish to install larger solar systems can receive an additional ₹17,000 subsidy from the State Government.

    • The government aims to install 27 lakh (2.7 million) rooftop solar plants, adding 3,000 MW (3 GW) of capacity.


Model 2: Utility-Led Aggregation (ULA) – Community Solar Plants

  1. Target Audience

    • This model is designed for 77 lakh (7.7 million) consumers who have low electricity usage or lack rooftop space for solar panels.

  2. Community Solar Plant Setup

    • A shared solar plant will be installed for these consumers.

    • The plants will have up to 1 MW capacity with 2 MWh battery storage.

    • Each consumer will receive 1.1 kW capacity, ensuring 150 units of free electricity monthly.

  3. Financial Model

    • Estimated cost per MW: ₹6.15 crore (including battery backup).

    • Implementation through the Hybrid Annuity Model (HAM).

    • State Government to issue tenders for the project.

    • Remaining project costs (after Central Government subsidy) will be covered over 3 years via annuity payments.


Model 3: PM Surya Ghar Yojana – Incentives for Non-Beneficiaries of CM Free Electricity Scheme

  1. Who is Eligible?

    • Consumers who are not covered under the CM Free Electricity Scheme but wish to install rooftop solar under the PM Surya Ghar Yojana can still avail certain benefits.

  2. Benefits for These Consumers

    • They will receive a free induction cooktop as an additional incentive.

    • A feed-in tariff incentive of ₹0.15 (15 paise) per unit for excess electricity exported to the grid.

  3. Pending Clarifications

    • The government is yet to confirm whether the ₹0.15 per unit incentive applies to total generation or only to the additional exported units.


Implementation Timeline

  • The scheme will be in effect until March 31, 2028.


Conclusion

This initiative by the Rajasthan government is a game-changer in the renewable energy sector. By integrating state and central government policies, it ensures that millions of households can access affordable and sustainable electricity while promoting clean energy adoption. Whether through individual rooftop solar installations or community solar plants, this scheme paves the way for a solar-powered Rajasthan and a brighter, greener future!

 
 
 
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