A bifacial solar panel produces 5–25% more energy than a standard monofacial panel of the same wattage. In India’s high-irradiance conditions, a bifacial panel with 80% bifaciality and a light-coloured ground surface typically delivers 10–20% additional energy yield – translating directly into a faster ROI on every solar project.
What Is Bifacial Energy Yield and Why Does It Matter?
Every solar panel has a front side that faces the sun and captures direct irradiance. A bifacial solar panel adds a second active surface on the rear that captures reflected and diffused light from the ground and surroundings – a phenomenon called albedo irradiance.
The total energy a bifacial panel generates is therefore:
Total Output = Front Side Output + (Rear Side Output × Bifaciality Factor)
For a project developer or EPC contractor in India, this additional rear-side energy generation means more units per rupee of investment — without adding any extra panels, inverters, or land.
What Is Bifacial Gain? Understanding the Numbers
Bifacial gain is the percentage increase in energy output from a bifacial panel compared to an identical monofacial panel under the same conditions.
The formula is straightforward:
Bifacial Gain (%) = (Bifacial Output − Monofacial Output) ÷ Monofacial Output × 100
In practice, bifacial gain in India ranges from 5% to 25% depending on:
- Ground surface albedo (reflectivity)
- Panel tilt angle and mounting height
- Row spacing in the array
- The panel’s bifaciality coefficient
- Local irradiation levels
Bifacial Gain by Ground Surface – India Reference Table
The ground surface beneath your solar installation has the single biggest influence on bifacial gain. Here is the expected bifacial gain for Powersphere‘s Suryatop and Agnitop panels (80% bifaciality) across different surface types common in Indian solar projects:
| Ground Surface | Albedo Value | Bifacial Gain (80% Bifaciality) | Common in India |
| White gravel / white paint | 0.60–0.80 | 20–25% | Utility ground-mount |
| Concrete / light grey | 0.35–0.50 | 12–18% | Industrial rooftop |
| Dry sand / light soil | 0.25–0.40 | 10–15% | Rajasthan, Gujarat solar farms |
| Grass / vegetation | 0.20–0.25 | 8–12% | Agri-solar installations |
| Dark soil / asphalt | 0.05–0.15 | 5–8% | Industrial compounds |
| Black EPDM membrane | 0.04–0.08 | 3–5% | Commercial flat rooftop |
Real-World Bifacial Energy Yield Calculation – India Example
Let us calculate the actual energy benefit for a 1 MW ground-mount project in Tamil Nadu using Powersphere’s Suryatop 635W panels:
System Parameters
- Location: Salem, Tamil Nadu – 5.5 peak sun hours/day
- Panel: Suryatop 635W, 80% bifaciality
- Ground surface: Light gravel (albedo 0.45) → bifacial gain 15%
- System size: 1 MW (1,575 panels approximately)
Energy Yield Comparison
| Scenario | Daily Output | Annual Output | 25-Year Output |
| Standard monofacial (635W) | 4,400 kWh | 16,06,000 kWh | 4.01 crore kWh |
Suryatop bifacial (635W, 15% gain) | 5,060 kWh | 18,46,900 kWh | 4.62 crore kWh |
| Extra energy from bifacial | +660 kWh | +2,40,900 kWh | +60 lakh kWh |
At ₹4/unit average tariff, the additional 60 lakh kWh over 25 years equals approximately ₹2.4 crore in additional revenue from bifacial gain alone – from the same 1 MW installation, with no additional capital expenditure.
How Bifaciality Percentage Affects Energy Gain
Not all bifacial panels are created equal. The bifaciality coefficient determines how efficiently the rear side converts reflected light into electricity. A panel with 80% bifaciality delivers 80% of the rear-side irradiance as additional power – compared to only 65% for a panel with 65% bifaciality.
| Bifaciality Coefficient | Rear-Side Efficiency | Gain at 0.35 Albedo | Gain at 0.55 Albedo |
| 65% | Moderate | ~8% | ~13% |
| 70% | Good | ~9% | ~15% |
| 75% | Very Good | ~10% | ~17% |
| 80% (Suryatop / Agnitop) | Excellent | ~12% | ~20% |
Powersphere’s Suryatop and Agnitop both achieve up to 80% bifaciality – placing them in the highest performance tier available from any Indian solar panel manufacturer.
N-Type TOPCon: Why It Matters for Bifacial Performance
Bifacial performance is not just about the rear surface – it is equally dependent on the cell technology. N-Type TOPCon cells deliver higher bifacial performance than P-Type PERC cells for two reasons:
Symmetrical cell structure: N-Type silicon has a more uniform carrier lifetime, enabling efficient rear-side current generation without the boron-oxygen defects that affect P-type cells under light exposure.
Lower LID on rear side: P-Type PERC bifacial panels experience Light-Induced Degradation on both front and rear surfaces. N-Type TOPCon is virtually immune to LID – meaning the bifacial gain is maintained consistently year after year, not just in the first 12 months.
This is why Powersphere chose N-Type TOPCon technology for both Suryatop and Agnitop – not just for front-side efficiency, but for sustained bifacial gain across the full 30-year system life.
Powersphere Bifacial Solar Panels – Specifications
Suryatop – G12R N-Type TOPCon (610–635W)
- Cell technology: N-Type TOPCon G12R half-cut (230mm)
- Power range: 610W to 635W
- Module efficiency: up to 23.51%
- Bifaciality: up to 80%
- Temperature coefficient (γ): –0.30%/°C
- Product warranty: 12 years | Performance warranty: 30 years
- Best for: utility-scale ground-mount, large commercial (5MW+)
Agnitop – M10 N-Type TOPCon (585–610W)
- Cell technology: N-Type TOPCon M10 half-cut (182mm)
- Power range: 585W to 610W
- Module efficiency: up to 23.60%
- Bifaciality: up to 80%
- Temperature coefficient (γ): –0.30%/°C
- Product warranty: 12 years | Performance warranty: 30 years
- Best for: commercial rooftop, industrial plants, mid-scale projects
Both panels are manufactured at Powersphere’s Salem, Tamil Nadu facility with 800 MW per annum production capacity.
How to Maximise Bifacial Gain on Your Solar Project
To extract the maximum energy yield from bifacial panels in India, EPC contractors and project developers should follow these installation guidelines:
- Ground surface: Use light-coloured gravel, white paint, or concrete beneath ground-mounted arrays. A simple white-gravel treatment can increase bifacial gain from 10% to 20%.
- Mounting height: Install panels at least 0.8–1.0 metres above the ground to allow diffuse rear-side irradiance to reach the panel back. Lower mounting reduces bifacial gain significantly.
- Row spacing: Wider row spacing reduces inter-row shading of the rear surface. For bifacial arrays, a ground coverage ratio (GCR) of 0.35–0.40 is recommended for South India.
- Tilt angle: In Tamil Nadu and Karnataka, a 12–18° tilt angle optimises both direct and diffuse irradiance capture for bifacial panels.
- Panel cleaning: Rear surface soiling reduces bifacial gain. Schedule rear-surface cleaning every 2–3 months for ground-mounted installations.
Looking for High-Bifaciality N-Type TOPCon Solar Panels in India?
Powersphere’s Suryatop and Agnitop deliver up to 80% bifaciality – among the highest available from any Indian solar manufacturer. Both are manufactured at our Salem, Tamil Nadu facility with 800 MW/year capacity and come with 12-year product + 30-year performance warranties.
→ See Suryatop Specifications
→ See Agnitop Specifications
→ Enquire for Bulk Pricing
Frequently Asked Questions About Bifacial Solar Panel Energy Yield
In India, a bifacial solar panel with 80% bifaciality produces 10–20% more energy than an equivalent monofacial panel under typical installation conditions. In high-albedo environments such as white gravel ground-mounted arrays in Rajasthan or Tamil Nadu, bifacial gain can reach 20–25%.
Bifacial gain on rooftops is lower than ground-mount – typically 3–8% on dark membrane rooftops and 8–15% on light-coloured concrete rooftops. For maximum bifacial gain on rooftops, mounting height above the roof surface and surface albedo are the key variables.
Yes. N-Type TOPCon bifacial panels maintain their bifacial gain more consistently over time because they are not susceptible to Light-Induced Degradation (LID) on the rear surface. PERC bifacial panels can lose 1–2% of rear-side gain in the first year due to LID. Over a 25-year project life, TOPCon bifacial panels deliver meaningfully higher total energy yield.
For commercial and utility-scale solar projects in India, look for a bifaciality coefficient of 75% or higher. Powersphere’s Suryatop and Agnitop panels achieve up to 80% bifaciality — delivering maximum rear-side energy capture in every installation condition.
Use this formula: Bifacial Gain (%) = Bifaciality Coefficient × Albedo × (1 − Shading Factor) × 100. For a Suryatop panel (80% bifaciality) on a concrete rooftop (albedo 0.35) with 10% rear shading: 0.80 × 0.35 × 0.90 × 100 = 25.2% maximum bifacial gain potential, with real-world yield typically 10–18% after system losses.
Bifacial Solar Panels for High-Efficiency Solar Projects
Power Sphere Renewable is a manufacturer and supplier of bifacial solar panels, which are used for projects where energy production is a priority. Bifacial solar panels are popular among EPC contractors and solar developers, as they can harness energy from both sides of the panel, thus increasing the overall efficiency of the solar power system. These solar modules are also popular among utility-scale solar projects, commercial-scale solar projects, and large-scale EPC projects where more energy production is required per area of installation.
At PowerSphere Renewable, we are a structured solar panel manufacturing company that focuses on the quality of our manufacturing process. Our manufacturing system is designed for large-scale solar panel production with high standards of quality at every step of production.
Production Capability and Manufacturing Strength
With precision-driven production systems, our solar manufacturing facility in India is built to produce reliable results.
Important manufacturing skills consist of:
• Automated stringing and tabbing lines
• Complex procedures for lamination and module assembly
• Testing for defects using electroluminescence (EL)
• Mechanical load testing to ensure durability
• Protocols for multi-stage quality inspection
• Traceability and organized sourcing of raw materials
To assist EPC contractors and developers managing large solar installations, we run scalable production capacity. To guarantee field performance and dependability, each module is tested prior to shipment.
Technology and Product Range
PowerSphere Renewable makes photovoltaic modules designed to meet today’s solar project needs.
Bifacial Solar Panels
These panels produce electricity from both the front and back sides, boosting overall energy output in places like ground-mounted solar setups with reflective surfaces.
Mono PERC Modules
These high-efficiency panels work well for commercial and industrial rooftops.
Half-Cut Cell Modules
They offer better performance by cutting down power loss and increasing durability.
High-Efficiency Solar Panels
Optimized to get the maximum power from limited space.
As an Indian manufacturer and supplier of solar PV modules, we focus on making products that deliver steady performance and last a long time.
Certifications and Compliance
For EPC projects and government bids, having the right certifications is crucial when picking modules.
PowerSphere Renewable meets important standards like:
- BIS Certification
- MNRE module requirements
- IEC certification norms
- ISO-certified manufacturing
We prepare our documents and tests to align with procurement needs for both commercial and large-scale solar projects.
Why Choose PowerSphere Renewable?
- Established solar manufacturing setup
- Certified quality checks
- Dependable large-scale production
- Nationwide logistics and delivery network
- Uniform module performance
- Technical support for EPC projects
- Clear and transparent compliance paperwork
We help procurement teams with open communication, organized delivery schedules, and reliable product quality.
PAN-India Distribution and Project Support
PowerSphere Renewable delivers modules across key solar markets in India, including:
- Gujarat
- Rajasthan
- Maharashtra
- Tamil Nadu
- Karnataka
- Telangana
- Uttar Pradesh
- Madhya Pradesh
Our modules are applied in:
- Large utility solar plants
- Ground-mounted bifacial setups
- Commercial rooftop installations
- Industrial solar projects
We take care of safe transport and make sure deliveries arrive on time to fit project timelines.
FAQ Section
India has multiple certified solar module manufacturers supplying photovoltaic modules for domestic and international projects. Reliable manufacturers maintain BIS certification, IEC compliance, and structured production systems.
Manufacturers should hold BIS certification, comply with IEC testing standards, and operate under ISO-certified quality systems. MNRE compliance is important for government projects.
PowerSphere Renewable operates scalable manufacturing capacity designed to support bulk EPC and utility-scale solar projects.
Yes. We supply solar modules across India through a structured logistics network supporting EPC contractors and developers.
Evaluate manufacturing infrastructure, certifications, quality testing processes, supply consistency, and documentation transparency before finalising a supplier.
