Waaree WS-545 Bifacial vs Waaree WS-440
The Waaree WS-545 Bifacial wins this comparison by a clear margin. It delivers more power (545W vs 440W). For most residential installations, the Waaree WS-545 Bifacial is the stronger choice.
Key Differences
- • Waaree WS-545 Bifacial is rated at 545W while Waaree WS-440 is rated at 440W, a 105W difference.
- • Waaree WS-440 achieves 21.8% efficiency vs 21.2% for the other, a 0.6 percentage point gap.
- • Both carry matching 12-year product warranties.
- • Waaree WS-545 Bifacial uses TOPCon N-type Bifacial cells while Waaree WS-440 uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Waaree WS-440 achieves 21.8% module efficiency compared to Waaree WS-545 Bifacial's 21.2%, meaning Waaree WS-440 converts 0.6 percentage points more sunlight into electricity per square meter. In practical terms, the Waaree WS-545 Bifacial produces 211.0 watts per square meter of panel area while the Waaree WS-440 produces 225.3 W/m². For rooftop installations where space is limited, this efficiency gap determines how many kilowatts you can fit on your available roof area. Over a 25-year system life, even a small efficiency advantage compounds into meaningful additional energy production.
Power Output
The Waaree WS-545 Bifacial delivers 545W per panel versus 440W for the Waaree WS-440, a 105W difference per module. To build an 8 kW residential system, you would need 15 Waaree WS-545 Bifacial panels or 19 Waaree WS-440 panels. Choosing the higher-wattage option saves 4 panels, reducing total racking hardware, wiring, and installation labor costs. Higher wattage per panel is particularly valuable for commercial-scale installations where panel count directly impacts balance-of-system costs.
Temperature Coefficient
Both panels share an identical temperature coefficient of -0.3%/°C, meaning they lose power at the same rate as cell temperature rises above the 25°C standard test baseline. At 65°C cell temperature, both retain 94.0% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Waaree WS-545 Bifacial is backed by a 12-year product warranty and 30-year performance guarantee, while the Waaree WS-440 offers 12-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (1% first year then 0.4%/year for Waaree WS-545 Bifacial; 1% first year then 0.4%/year for Waaree WS-440), after 25 years the Waaree WS-545 Bifacial should retain approximately 89.4% of original output versus 89.4% for the Waaree WS-440. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Waaree WS-545 Bifacial measures 2278×1134×35mm and weighs 28 kg, while the Waaree WS-440 measures 1722×1134×30mm at 21.5 kg. 2.58 m² of panel area for the Waaree WS-545 Bifacial versus 1.95 m² for the Waaree WS-440. The Waaree WS-440 is 6.5 kg lighter per panel, which reduces structural load requirements on the roof and makes handling easier during installation. For a 20-panel system, that is a total weight difference of 130 kg. The more compact Waaree WS-440 may be easier to fit on irregularly shaped or space-limited rooftops.
Specification Comparison
| Specification | Waaree WS-545 Bifacial | Waaree WS-440 |
|---|---|---|
| Power | 545W | 440W |
| Efficiency | 21.2% | 21.8% |
| Power Density | 19.6 W/sq ft | 20.9 W/sq ft |
| Cell Type | TOPCon N-type Bifacial | TOPCon N-type |
| Bifacial | Yes | No |
| Weight | 28 kg | 21.5 kg |
| Temp Coefficient | -0.3%/°C | -0.3%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 12 years |
| Performance Warranty | 30 years | 25 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | India | India |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Waaree WS-440The Waaree WS-440 achieves 21.8% efficiency versus 21.2% — a 0.6 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 3.1 kW more total system capacity, or 15 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.3%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: TieBoth panels offer identical 12-year product warranties and 0.4% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Waaree WS-545 BifacialThe Waaree WS-545 Bifacial delivers 545W versus 440W per panel — 105W more. For an 8 kW system, you need 15 panels with the higher-wattage option versus 19 panels, saving 4 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieThe Waaree WS-545 Bifacial uses TOPCon N-type Bifacial: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. The Waaree WS-440 uses TOPCon N-type: TOPCon (Tunnel Oxide Passivated Contact) adds a thin tunnel oxide layer to reduce recombination losses, achieving higher efficiency than PERC while being manufacturable on existing production lines. Both are equivalent-generation technologies.
Waaree WS-545 Bifacial
The Waaree WS-545 Bifacial is a 545W TOPCon N-type bifacial panel from India's largest solar module manufacturer. Waaree Energies has rapidly scaled to become a top-10 global solar manufacturer, and the WS-545 represents their flagship utility and commercial product. The bifacial design captures reflected light from the rear side for 5-25% additional energy gain depending on ground albedo. The N-type TOPCon cells deliver -0.30%/°C temperature coefficient and lower degradation than PERC. Waaree's Indian manufacturing provides an alternative supply chain to Chinese panels, particularly relevant for markets implementing anti-dumping duties.
Pros
- + Indian manufacturing — alternative to Chinese supply chain
- + Bifacial design adds 5-25% energy gain from rear side
- + TOPCon N-type with -0.30%/°C temp coefficient
- + Competitive pricing — among the most affordable TOPCon bifacial panels
- + 30-year performance warranty with low 0.4% annual degradation
- + Waaree is India's largest module manufacturer with 12+ GW capacity
Cons
- - Limited US brand recognition and distribution
- - 12-year product warranty shorter than premium brands' 25 years
- - 545W is mid-range — Chinese competitors offer 580W+ in same size
- - Bifacial gain requires appropriate mounting (ground or elevated rack)
Waaree WS-440
The Waaree WS-440 is a 440W residential-format TOPCon N-type panel in the standard 108-cell configuration, manufactured at Waaree's state-of-the-art facilities in Gujarat, India. At 21.8% efficiency, it competes directly with Chinese TOPCon panels while offering Indian supply chain diversification. The standard 1722 x 1134mm form factor ensures compatibility with all major racking systems. Waaree's rapidly expanding US distribution makes this one of the most accessible Indian-made panels in the North American market.
Pros
- + Indian-manufactured — non-Chinese supply chain alternative
- + 21.8% efficiency competitive with Chinese TOPCon leaders
- + Standard 108-cell residential format — universal racking compatibility
- + -0.30%/°C temp coefficient for hot climate performance
- + Highly competitive pricing — among the lowest-cost TOPCon panels
- + Waaree's expanding US distribution improves availability
Cons
- - 12-year product warranty shorter than 25-year leaders
- - Indian manufacturing quality perception still developing vs established brands
- - US installer familiarity and support network still growing
- - No bifacial option in this residential format
Choose Waaree WS-545 Bifacial If...
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Commercial and utility-scale projects seeking cost-effective TOPCon bifacial panels from a non-Chinese supply chain, and ground-mount residential systems where bifacial gain is maximized.
Choose Waaree WS-440 If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ Cost-conscious residential installers seeking high-efficiency TOPCon panels from a non-Chinese manufacturer at a competitive price point.
Our Recommendation
We recommend the Waaree WS-545 Bifacial for most buyers in this comparison. It wins 1 of 5 key dimensions and offers a clear advantage in the metrics that matter most for a solar panel purchase. The Waaree WS-440 remains a good product, but the Waaree WS-545 Bifacial delivers better overall value for the majority of installations.
Frequently Asked Questions
Which is better, Waaree WS-545 Bifacial or Waaree WS-440?
The Waaree WS-545 Bifacial wins this comparison by a clear margin. It delivers more power (545W vs 440W). For most residential installations, the Waaree WS-545 Bifacial is the stronger choice.
Which panel is more efficient, Waaree WS-545 Bifacial or Waaree WS-440?
The Waaree WS-440 at 21.8% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 0.6 percentage points translates to approximately 105W per panel under standard test conditions.
Which has a better warranty, Waaree WS-545 Bifacial or Waaree WS-440?
The Waaree WS-545 Bifacial comes with a 12-year product warranty and 30-year performance guarantee. The Waaree WS-440 offers 12-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Waaree WS-545 Bifacial has a temperature coefficient of -0.3%/°C and the Waaree WS-440 is -0.3%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Waaree WS-545 Bifacial vs Waaree WS-440 panels do I need for an 8 kW system?
For an 8 kW system: you need 15 Waaree WS-545 Bifacial panels (545W each) or 19 Waaree WS-440 panels (440W each). The Waaree WS-545 Bifacial requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026