Searching for LONGi double glass panels Pakistan 2026? You’ve made the right choice—double glass (bifacial) solar panels from LONGi represent the cutting-edge of solar technology available in Pakistan today. Unlike traditional single-glass monofacial panels that capture sunlight only from the front, LONGi’s double glass bifacial panels generate electricity from both the front AND back surfaces, delivering 10-30% more energy output under optimal conditions.
This comprehensive guide reveals everything you need to know about LONGi double glass panels in Pakistan’s 2026 market: current pricing, technical specifications, installation benefits, warranty terms, and which models offer the best value. Whether you’re installing a 3kW home system or a 50kW+ commercial solar farm, this article provides the complete roadmap to understanding, evaluating, and purchasing the right LONGi double glass panel for your specific needs.
What Are LONGi Double Glass Panels? Understanding Bifacial Technology
LONGi double glass panels are revolutionary solar modules designed to capture sunlight on both front and rear surfaces, unlike traditional single-glass panels limited to front-surface generation.
Single Glass vs. Double Glass: The Critical Difference
Traditional Single-Glass (Monofacial) Panels:
- Solar cells on front surface only
- Aluminum backing sheet reflects light away
- Generate electricity from direct sunlight only
- Efficiency: 18-21%
- Standard for 15+ years globally
LONGi Double Glass (Bifacial) Panels:
- Solar cells on both front and rear surfaces
- Tempered glass on both sides allows light penetration from rear
- Capture direct sunlight + reflected light from ground (albedo)
- Efficiency: 21-25%
- Latest technology deployed since 2015
How Double Glass Panels Generate More Electricity
The bifaciality factor (typically 70-75% for LONGi modules) indicates the percentage of power generated from the rear surface compared to the front. This means:
- If front surface generates 400W (100% output)
- Rear surface generates 280-300W (70-75% of front output)
- Total output: 680-700W from same physical footprint
The reflected light source depends on ground albedo (reflectivity):
- White surfaces (snow, concrete, sand): 30-40% albedo → maximum rear generation
- Green surfaces (grass, vegetation): 20-25% albedo → moderate rear generation
- Dark surfaces (asphalt, soil): 15-20% albedo → minimal rear generation
- Water: 5-15% albedo → low rear generation
Practical example: A 540W LONGi Hi-MO 5 double glass panel mounted 1 meter above white concrete might actually generate 570-600W total output due to albedo reflection—a 10-15% performance boost. (link to your article on “solar panel albedo and ground reflectivity in Pakistan”)
LONGi Double Glass Panels Available in Pakistan 2026: Complete Model Lineup
1. LONGi Hi-MO 5 Series – The Established Performer
Specifications:
- Wattage: 540W, 545W, 550W (bifacial double glass options)
- Cell Technology: P-type PERC (Passivated Emitter Rear Cell)
- Efficiency: 20.6% to 21.7%
- Bifaciality Factor: 70-75%
- Dimensions: 2272mm × 1134mm × 35mm
- Weight: 22.5 kg (lightweight for installation)
- Temperature Coefficient: -0.35%/°C (excellent heat performance)
Pakistan 2026 Pricing:
- Per watt: PKR 36-38
- 540W panel: PKR 19,440-20,520
- 550W panel: PKR 19,800-20,900
Key Advantages:
- Established track record (launched 2015, millions deployed globally)
- Proven durability in Pakistan’s climate
- 10-year product warranty + 25-year performance warranty
- Low degradation: 0.55% annually (excellent long-term value)
- Half-cut cell design reduces internal losses
- Superior shading tolerance
Best For: Budget-conscious buyers wanting proven bifacial technology, residential systems, investors prioritizing reliability over cutting-edge features
Honest Assessment: Hi-MO 5 is mature technology—excellent but not the latest innovation. Suitable for conservative buyers unwilling to take early-adoption risks.
2. LONGi Hi-MO 6 Series – The Popular Choice
Specifications:
- Wattage: 545W, 550W, 555W, 560W (bifacial double glass)
- Cell Technology: HPBC (Half-cut Passivated Back Contact)
- Efficiency: 21.0% to 22.1%
- Bifaciality Factor: 72-75%
- Dimensions: 2277mm × 1134mm × 35mm
- Weight: 23 kg
- Temperature Coefficient: -0.35%/°C
Pakistan 2026 Pricing:
- Per watt: PKR 35-37
- 550W panel: PKR 19,250-20,350
- 560W panel: PKR 19,600-20,720
Key Advantages:
- Newest P-type technology available (as of 2024)
- 1.5% efficiency improvement vs. Hi-MO 5
- Excellent performance in partial shading (thanks to back contact design)
- Better performance on cloudy days
- 10-year product + 25-year performance warranty
- Degradation: 0.5% annually (superior to Hi-MO 5)
Best For: Homeowners wanting latest proven technology, commercial installations prioritizing performance, those in areas with frequent cloud cover
Why It’s Popular: Represents the “sweet spot”—newer than Hi-MO 5, but mature enough for widespread deployment. Most Pakistani installers stock Hi-MO 6 as standard option.
3. LONGi Hi-MO 7 Series – The New Premium Standard
Specifications:
- Wattage: 590W, 600W, 605W, 615W (bifacial double glass with N-type technology)
- Cell Technology: HPDC (Half-Cut Double Contact) with N-type monocrystalline
- Efficiency: 22.8% to 23.2%
- Bifaciality Factor: 75-78% (highest in LONGi lineup)
- Dimensions: 2277mm × 1134mm × 40mm (slightly thicker for durability)
- Weight: 26 kg
- Temperature Coefficient: -0.35%/°C (same excellent performance)
Pakistan 2026 Pricing:
- Per watt: PKR 37-40
- 590W panel: PKR 21,830-23,600
- 615W panel: PKR 22,755-24,600
Key Advantages:
- N-type technology (next-generation, superior to P-type)
- Highest efficiency in LONGi portfolio (23.2%)
- Best bifaciality factor (75-78%)
- Ultra-low degradation: 0.45% annually (best long-term value)
- 12-year product + 30-year performance warranty (extended vs. other series)
- Superior temperature performance (-0.35°C coefficient)
- Exceptional performance in heat (important for Pakistan’s climate)
Best For: Commercial installations, solar farms, investors prioritizing 30-year lifetime value, those in intense-heat regions (interior Sindh, Balochistan)
Real-World Impact: A 615W Hi-MO 7 might cost PKR 2,000-3,000 more than Hi-MO 6 equivalent, but generates 3.5% more electricity over 30 years—worth ~PKR 150,000 additional revenue in Pakistan’s 5+ peak sun hours daily.
4. LONGi Hi-MO X10 Series – The Latest Innovation
Specifications:
- Wattage: 640W, 650W, 665W, 670W (newest double glass bifacial)
- Cell Technology: N-type TOPCon HPBC 2.0 (most advanced)
- Efficiency: 24.8% (industry-leading for monocrystalline)
- Bifaciality Factor: 75%+
- Dimensions: 2291mm × 1134mm × 40mm
- Weight: 27 kg
- Temperature Coefficient: -0.35%/°C
Pakistan 2026 Pricing:
- Per watt: PKR 37-40
- 640W panel: PKR 23,680-25,600
- 670W panel: PKR 24,790-26,800
Key Advantages:
- Highest efficiency available commercially (24.8%)
- TOPCon technology (Tunneling Oxide Passivated Contact)—most advanced 2026 technology
- Exceptional temperature coefficient (-0.35°C) means excellent Pakistan climate performance
- Bifacial + monofacial options available (flexibility)
- Extended warranty: 12 years product + 25-30 years performance
- Lowest degradation rate: 0.45% annually
- Cutting-edge research & development focus
Limitations:
- Recently launched in Pakistan (April 2025)—limited long-term track record
- Bifacial Hi-MO X10 availability is limited (as of February 2026)
- Higher cost reflects early-adopter premium
Best For: Forward-thinking investors, new installations where space is limited, solar farms maximizing per-square-meter output
Availability Note: As of February 2026, monofacial Hi-MO X10 is widely available in Pakistan. Bifacial Hi-MO X10 (double glass) is still in early shipments—availability improving month-to-month.
LONGi Double Glass Panels Price Comparison Table (Pakistan 2026)
| Model Series | Wattage | Efficiency | Bifaciality | Per Watt | Total Price | Warranty | Best Use |
|---|---|---|---|---|---|---|---|
| Hi-MO 5 | 540W | 20.6% | 70% | PKR 36-38 | PKR 19,440-20,520 | 10yr+25yr | Budget-conscious |
| Hi-MO 6 | 560W | 22.1% | 75% | PKR 35-37 | PKR 19,600-20,720 | 10yr+25yr | Most popular |
| Hi-MO 7 | 615W | 23.2% | 78% | PKR 37-40 | PKR 22,755-24,600 | 12yr+30yr | Premium value |
| Hi-MO X10 | 670W | 24.8% | 75%+ | PKR 37-40 | PKR 24,790-26,800 | 12yr+25yr | Cutting-edge |
Price Per Watt Comparison: Interestingly, per-watt cost is nearly identical across all LONGi series (PKR 35-40)—the difference is wattage and efficiency. Higher-wattage panels provide better total value due to lower BOP (balance of plant) costs.
Technical Specifications: Why Double Glass Design Matters for Pakistan
Tempered Glass on Both Sides
LONGi double glass panels use high-quality tempered glass on front and rear:
- Durability: Withstands hail, heavy rain, dust storms without cracking
- Light Transmission: 91-93% light penetration (excellent for rear-side generation)
- UV Resistance: Special coatings prevent yellowing/degradation
- Thermal Stability: Maintains structural integrity in Pakistan’s temperature extremes (0°C to 50°C+)
Benefit for Pakistan: Pakistan’s dust storms (particularly in interior Sindh/Punjab) can damage single-glass panels. Double glass design provides superior protection.
Aluminum Alloy Frame (Not Reflective Backing)
Unlike traditional panels with aluminum foil backing, LONGi double glass panels feature:
- Aluminum alloy frame (structural support)
- Tempered glass backing (light transmission)
- No reflective coating blocking rear light
- Anodized aluminum reduces corrosion (important in coastal Karachi)
Half-Cut Cell Design
LONGi uses 144-cell (Hi-MO 5/6) or 180-cell (Hi-MO 7/X10) configurations with half-cut cell technology:
- Reduces internal electrical losses by 2-3%
- Better performance under partial shading
- Lower hot spot temperature
- Increased current paths distribute power more efficiently
Temperature Coefficient: -0.35°C/°C
All LONGi double glass series maintain excellent -0.35%/°C temperature coefficient, meaning:
- At 25°C: 100% rated output
- At 50°C (Pakistan summer): 91.25% output (only 8.75% loss)
- Competitors at -0.45%/°C would suffer 13.5% loss at 50°C
Pakistan Advantage: LONGi’s superior temperature coefficient makes them exceptional for Pakistan’s extreme summer heat.
Where to Buy LONGi Double Glass Panels in Pakistan 2026
Authorized Distributors & Dealers
Karachi (Best Selection):
- Power House Express (official LONGi distributor)
- W11Stop Solar
- Kamal Solar House
- Solar Trade PK
- Nizam Energy
Lahore:
- Alpha Solar (extensive inventory)
- SolarShop.pk
- Accent Energy Pvt Ltd
- Techno Solar
- Shahid System
Islamabad/Rawalpindi:
- Royal Solar Energy
- Local solar shops on G-9 Market
Peshawar/KPK:
- Limited selection (order from Karachi/Lahore)
Multan/Faisalabad:
- Mehran Solar Company
- Local authorized dealers
Online Platforms
E-commerce Sites:
- Daraz.pk (limited, verify authenticity)
- Solar retailer websites (Alpha Solar, SolarShop.pk)
- Direct manufacturer website: LONGi.com (international, requires international shipping)
Caution: Only purchase from authorized LONGi distributors. Counterfeit LONGi panels circulate in Pakistani market—verify authenticity through COC (Certificate of Conformity) and PSI (Performance Series Index) certificates.
Recommended Verification Steps
Before purchasing LONGi double glass panels:
- Confirm seller is listed on LONGi’s official Pakistan distributors list
- Request COC and PSI certificates
- Inspect serial numbers for authenticity
- Ask for warranty documentation in English/Urdu
- Verify return/exchange policy if defects found
Installation Considerations for Double Glass Panels in Pakistan
Mounting System Requirements
LONGi double glass panels (27-28 kg for 615W models) require:
- Roof Capacity: Verify roof can support 30-40 kg/m² (distributed load)
- Racking Material: Aluminum or hot-dip galvanized steel (resist Pakistan’s humidity/salt air)
- Spacing: Minimum 15cm gap between rear surface and roof for air circulation (improves cooling, increases output by 2-3%)
- Orientation: South-facing, 30-35° tilt angle for Pakistan (adjust by latitude)
Electrical Compatibility
LONGi double glass panels work with:
- On-grid hybrid inverters (MPPT charge controllers essential)
- Off-grid systems (with battery storage)
- String inverters (multiple panels in series)
- Microinverters (individual panel optimization)
Recommendation: Use MPPT (Maximum Power Point Tracking) charge controllers rather than PWM controllers—improves efficiency by 15-25% with bifacial panels.
Professional Installation Required
Never DIY bifacial panel installation:
- Improper spacing reduces rear-surface generation
- Incorrect wiring voids warranty
- Mounting errors create safety risks
- Professional installation (PKR 5,000-15,000) is insurance against 30-year reliability
Climate Suitability: Why LONGi Double Glass Excels in Pakistan
Pakistan’s Climate Profile
Pakistan offers ideal conditions for LONGi bifacial panels:
Peak Sun Hours: 4.5-6 hours daily across Pakistan
- Karachi/Sindh: 5-6 hours (highest potential)
- Lahore/Punjab: 4.5-5.5 hours
- Islamabad: 4-4.5 hours
- Peshawar/KPK: 4-4.5 hours
Temperature Extremes: -5°C (northern) to +50°C (interior Sindh)
- LONGi’s -0.35%/°C coefficient handles both extremes optimally
Albedo Opportunities:
- Concrete surfaces (roofs): 30-40% reflectivity
- White-painted roofs: 50-60% reflectivity (farmers/commercial)
- Agricultural areas: 20-25% reflectivity
- Coastal areas: Salt-resistant glass essential
Dust/Environmental Factors:
- Double glass resists dust accumulation better than single glass
- Tempered glass withstands hail/storms
- Anodized frames resist coastal salt corrosion
Verdict: Pakistan’s sunshine, heat, and dust environment makes double glass bifacial panels particularly valuable compared to temperate climate installations.
Cost-Benefit Analysis: LONGi Double Glass vs. Traditional Single-Glass
10-Year Financial Comparison (Typical 5kW Installation)
Single-Glass System (5,000W):
- Panel cost: 500W × 5 × PKR 35/watt = PKR 87,500
- Mounting/installation: PKR 40,000
- Inverter/batteries/misc: PKR 150,000
- Total investment: PKR 277,500
- Annual generation (assume 5 hours/day, 0.8 efficiency): 5,840 kWh/year
- 10-year generation: 58,400 kWh
- Savings at PKR 30/kWh: PKR 1,752,000
LONGi Double Glass System (5,000W equivalent):
- Panel cost: 610W × 7 × PKR 38/watt = PKR 162,260
- 15% higher efficiency means 7 panels vs. 10 for single-glass
- Mounting/installation: PKR 45,000 (slightly higher)
- Inverter/batteries/misc: PKR 150,000
- Total investment: PKR 357,260
- Annual generation (10% more efficient): 6,424 kWh/year
- 10-year generation: 64,240 kWh
- Savings at PKR 30/kWh: PKR 1,927,200
- Net advantage: PKR 175,200 additional savings + extended panel warranty
Verdict: LONGi double glass costs 29% more upfront but delivers 10% more electricity, plus 20+ year longer operational lifespan—excellent ROI for residential and commercial installations.
Warranty & Degradation: Long-Term Performance Guarantees
LONGi Warranty Structure (All Double Glass Series)
Hi-MO 5 & Hi-MO 6:
- Product Warranty: 10 years (manufacturing defects)
- Performance Warranty: 25 years linear performance guarantee
- Year 1: Retains 98% capacity
- Years 2-25: 0.55% annual degradation
- Year 25: Retains 85.2% capacity
Hi-MO 7:
- Product Warranty: 12 years (improved)
- Performance Warranty: 30 years linear
- Year 1: Retains 98% capacity
- Years 2-30: 0.45% annual degradation
- Year 30: Retains 88.5% capacity
Hi-MO X10:
- Product Warranty: 12 years
- Performance Warranty: 25-30 years (varies by distributor)
- Year 1: Retains 98% capacity
- Years 2+: 0.45% annual degradation
Real-World Implication: A 610W Hi-MO 7 panel retains 540W output after 30 years—still capable of meaningful power generation for off-grid backup or supplementary loads.
Warranty Claim Process in Pakistan
If panel fails within warranty:
- Contact authorized distributor (not direct to LONGi)
- Provide COC, serial number, documentation
- Distributor arranges inspection/replacement
- Logistics arranged by distributor (may take 4-6 weeks)
Tip: Keep original packaging, COC, and invoice for 25-30 years. Digital copies also recommended.
FAQ: LONGi Double Glass Panels Pakistan 2026
Q1: What’s the difference between Hi-MO 6 and Hi-MO 7 for Pakistan?
A: Hi-MO 6 uses P-type PERC technology while Hi-MO 7 uses N-type HPDC—a generational upgrade. Hi-MO 7 is 1.1% more efficient (22.1% vs. 23.2%), generates 15-20% more power per panel, and has extended 30-year warranty vs. 25-year. However, cost per watt is similar (PKR 37-39). For new installations in 2026, Hi-MO 7 is recommended—the warranty extension justifies identical per-watt pricing.
Q2: Are LONGi double glass panels worth the premium over single-glass?
A: Yes, absolutely. Double glass panels cost 15-25% more upfront but deliver 10-15% more electricity annually, have superior durability in Pakistan’s climate (especially heat and dust), and last 20-30 years vs. 10-15 for traditional panels. The payback period is identical despite higher cost due to superior output. For any installation lasting 15+ years, bifacial double glass is superior value.
