Renogy 450W Bifacial Mono Solar Panel vs Waaree WS-440
The Renogy 450W Bifacial Mono Solar Panel wins this comparison by a narrow margin. It leads in efficiency (22.8% vs 21.8%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Renogy 450W Bifacial Mono Solar Panel is the stronger choice.
Key Differences
- • Renogy 450W Bifacial Mono Solar Panel is rated at 450W while Waaree WS-440 is rated at 440W, a 10W difference.
- • Renogy 450W Bifacial Mono Solar Panel achieves 22.8% efficiency vs 21.8% for the other, a 1.0 percentage point gap.
- • Both carry matching 12-year product warranties.
- • Renogy 450W Bifacial Mono Solar Panel has a superior temperature coefficient of -0.29%/°C vs -0.3%/°C, retaining more power in hot climates.
- • Renogy 450W Bifacial Mono Solar Panel uses N-Type Monocrystalline cells while Waaree WS-440 uses TOPCon N-type cells, representing different technology generations.
Specifications Breakdown
Module Efficiency
The Renogy 450W Bifacial Mono Solar Panel achieves 22.8% module efficiency compared to Waaree WS-440's 21.8%, meaning Renogy 450W Bifacial Mono Solar Panel converts 1.0 percentage points more sunlight into electricity per square meter. In practical terms, the Renogy 450W Bifacial Mono Solar Panel produces 233.1 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 Renogy 450W Bifacial Mono Solar Panel delivers 450W per panel versus 440W for the Waaree WS-440, a 10W difference per module. To build an 8 kW residential system, you would need 18 Renogy 450W Bifacial Mono Solar Panel panels or 19 Waaree WS-440 panels. Choosing the higher-wattage option saves 1 panel, 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
The Renogy 450W Bifacial Mono Solar Panel has a temperature coefficient of -0.29%/°C versus -0.3%/°C for the Waaree WS-440. On a hot summer day when cell temperature reaches 65°C (40°C above the 25°C STC baseline), the Renogy 450W Bifacial Mono Solar Panel retains 94.2% of its rated power while the other retains 94.0%. While the numerical gap is modest, it still accumulates over decades of summer production, especially in southern latitudes with prolonged peak heat hours.
Warranty Coverage
The Renogy 450W Bifacial Mono Solar Panel is backed by a 12-year product warranty and 25-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 Renogy 450W Bifacial Mono Solar Panel; 1% first year then 0.4%/year for Waaree WS-440), after 25 years the Renogy 450W Bifacial Mono Solar Panel 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 Renogy 450W Bifacial Mono Solar Panel measures 1801×1072×30mm and weighs 24.2 kg, while the Waaree WS-440 measures 1722×1134×30mm at 21.5 kg. 1.93 m² of panel area for the Renogy 450W Bifacial Mono Solar Panel versus 1.95 m² for the Waaree WS-440. The Waaree WS-440 is 2.7 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 54 kg. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Renogy 450W Bifacial Mono Solar Panel | Waaree WS-440 |
|---|---|---|
| Power | 450W | 440W |
| Efficiency | 22.8% | 21.8% |
| Power Density | 21.7 W/sq ft | 20.9 W/sq ft |
| Cell Type | N-Type Monocrystalline | TOPCon N-type |
| Bifacial | Yes | No |
| Weight | 24.2 kg | 21.5 kg |
| Temp Coefficient | -0.29%/°C | -0.3%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 12 years | 12 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 1% | 1% |
| Annual Degradation | 0.4% | 0.4% |
| Country | China | India |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel achieves 22.8% efficiency versus 21.8% — a 1.0 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.3 kW more total system capacity, or 2 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel has a better temperature coefficient of -0.29%/°C versus -0.3%/°C. On a 45°C summer day (20°C above STC), the winner retains 94.2% of rated power versus 94.0%. The difference is modest but accumulates over 25 years of summer production.
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: Renogy 450W Bifacial Mono Solar PanelThe Renogy 450W Bifacial Mono Solar Panel delivers 450W versus 440W per panel — 10W more. For an 8 kW system, you need 18 panels with the higher-wattage option versus 19 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: Waaree WS-440The Renogy 450W Bifacial Mono Solar Panel uses N-Type Monocrystalline: N-Type Monocrystalline. 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. TOPCon N-type represents a newer generation technology with a longer performance runway as manufacturing matures.
Renogy 450W Bifacial Mono Solar Panel
The Renogy 450W Bifacial Mono Solar Panel is Renogy's flagship residential/commercial panel, combining N-Type monocrystalline cells with bifacial technology for up to 25% additional energy gain from reflected light.
Pros
- + Bifacial design with up to 25% energy gain
- + 22.8% efficiency with N-Type cells
- + 12-year product warranty — Renogy's longest
- + Good temperature coefficient at -0.29%/°C
- + UL 1703 certified for residential and commercial
Cons
- - 24.2 kg heavier than most residential panels
- - Bifacial gain requires proper mounting height and ground albedo
- - Higher upfront cost than monofacial alternatives
- - Large 1.93 m² footprint
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 Renogy 450W Bifacial Mono Solar Panel If...
- ✓ Your roof space is limited and you need maximum power per panel
- ✓ You want fewer panels to reach your target system size, reducing racking and labor costs
- ✓ You live in a hot climate (Arizona, Texas, Florida) where heat performance matters
- ✓ Residential and commercial installations seeking maximum energy harvest with bifacial gain, especially ground-mount systems.
Choose Waaree WS-440 If...
- ✓ 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
Both the Renogy 450W Bifacial Mono Solar Panel and Waaree WS-440 are excellent solar panel options, and the margin between them is narrow. The Renogy 450W Bifacial Mono Solar Panel wins 3 of 5 comparison dimensions by a slim margin. Your decision may come down to local pricing, installer availability, and which specific performance metrics matter most for your project. Either product is a solid investment.
Frequently Asked Questions
Which is better, Renogy 450W Bifacial Mono Solar Panel or Waaree WS-440?
The Renogy 450W Bifacial Mono Solar Panel wins this comparison by a narrow margin. It leads in efficiency (22.8% vs 21.8%) and matches or exceeds on warranty (12 vs 12 years). For most residential installations, the Renogy 450W Bifacial Mono Solar Panel is the stronger choice.
Which panel is more efficient, Renogy 450W Bifacial Mono Solar Panel or Waaree WS-440?
The Renogy 450W Bifacial Mono Solar Panel at 22.8% module efficiency. Higher efficiency means more watts per square foot of roof space, which is critical for space-constrained installations. The difference of 1.0 percentage points translates to approximately 10W per panel under standard test conditions.
Which has a better warranty, Renogy 450W Bifacial Mono Solar Panel or Waaree WS-440?
The Renogy 450W Bifacial Mono Solar Panel comes with a 12-year product warranty and 25-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 Renogy 450W Bifacial Mono Solar Panel has a temperature coefficient of -0.29%/°C and the Waaree WS-440 is -0.3%/°C. Renogy 450W Bifacial Mono Solar Panel retains more power in heat — important in states like Arizona, Texas, and Florida. A lower (less negative) temperature coefficient is better.
How many Renogy 450W Bifacial Mono Solar Panel vs Waaree WS-440 panels do I need for an 8 kW system?
For an 8 kW system: you need 18 Renogy 450W Bifacial Mono Solar Panel panels (450W each) or 19 Waaree WS-440 panels (440W each). The Renogy 450W Bifacial Mono Solar Panel requires fewer panels, saving on racking hardware and installation labor.
Related Resources
Last updated: February 2026