Panasonic EverVolt HK 430W vs Panasonic EVPV400H
The Panasonic EverVolt HK 430W wins this comparison by a narrow margin. It leads in efficiency (22.2% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt HK 430W is the stronger choice.
Key Differences
- • Panasonic EverVolt HK 430W is rated at 430W while Panasonic EVPV400H is rated at 400W, a 30W difference.
- • Panasonic EverVolt HK 430W achieves 22.2% efficiency vs 21.2% for the other, a 1.0 percentage point gap.
- • Both carry matching 25-year product warranties.
Specifications Breakdown
Module Efficiency
The Panasonic EverVolt HK 430W achieves 22.2% module efficiency compared to Panasonic EVPV400H's 21.2%, meaning Panasonic EverVolt HK 430W converts 1.0 percentage points more sunlight into electricity per square meter. In practical terms, the Panasonic EverVolt HK 430W produces 220.2 watts per square meter of panel area while the Panasonic EVPV400H produces 204.8 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 Panasonic EverVolt HK 430W delivers 430W per panel versus 400W for the Panasonic EVPV400H, a 30W difference per module. To build an 8 kW residential system, you would need 19 Panasonic EverVolt HK 430W panels or 20 Panasonic EVPV400H 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
Both panels share an identical temperature coefficient of -0.26%/°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 94.8% of rated power. Neither panel has a thermal performance advantage, which makes this specification a non-factor in the comparison.
Warranty Coverage
The Panasonic EverVolt HK 430W is backed by a 25-year product warranty and 25-year performance guarantee, while the Panasonic EVPV400H offers 25-year product and 25-year performance coverage. Both offer identical product warranty duration. Based on their published degradation rates (0.5% first year then 0.35%/year for Panasonic EverVolt HK 430W; 0.5% first year then 0.35%/year for Panasonic EVPV400H), after 25 years the Panasonic EverVolt HK 430W should retain approximately 91.1% of original output versus 91.1% for the Panasonic EVPV400H. The end-of-life output levels are closely matched.
Physical Dimensions & Weight
The Panasonic EverVolt HK 430W measures 1722×1134×30mm and weighs 22.5 kg, while the Panasonic EVPV400H measures 1722×1134×30mm at 21 kg. 1.95 m² of panel area for the Panasonic EverVolt HK 430W versus 1.95 m² for the Panasonic EVPV400H. Their weights are closely matched, so neither panel imposes a significantly different structural load on the mounting system. Similar footprints mean both panels fit comparably on standard residential rooftop configurations.
Specification Comparison
| Specification | Panasonic EverVolt HK 430W | Panasonic EVPV400H |
|---|---|---|
| Power | 430W | 400W |
| Efficiency | 22.2% | 21.2% |
| Power Density | 20.5 W/sq ft | 19.0 W/sq ft |
| Cell Type | HJT (Heterojunction) | HJT (Heterojunction) |
| Bifacial | Yes | Yes |
| Weight | 22.5 kg | 21 kg |
| Temp Coefficient | -0.26%/°C | -0.26%/°C |
| Snow Load | 5400 Pa | 5400 Pa |
| Wind Load | 2400 Pa | 2400 Pa |
| Product Warranty | 25 years | 25 years |
| Performance Warranty | 25 years | 25 years |
| Degradation (Year 1) | 0.5% | 0.5% |
| Annual Degradation | 0.35% | 0.35% |
| Country | Japan | Japan |
5-Dimension Head-to-Head Analysis
1. Efficiency & Power Density
Winner: Panasonic EverVolt HK 430WThe Panasonic EverVolt HK 430W achieves 22.2% efficiency versus 21.2% — a 1.0 percentage point advantage. On a typical 30-panel residential roof, this translates to approximately 0.9 kW more total system capacity, or 5 kWh more annual production in an average US location.
2. Hot Climate Performance
Winner: TieBoth panels share a temperature coefficient of -0.26%/°C — identical heat tolerance.
3. Durability & Warranty
Winner: TieBoth panels offer identical 25-year product warranties and 0.35% annual degradation. Neither has a durability advantage.
4. Power Output
Winner: Panasonic EverVolt HK 430WThe Panasonic EverVolt HK 430W delivers 430W versus 400W per panel — 30W more. For an 8 kW system, you need 19 panels with the higher-wattage option versus 20 panels, saving 1 panels and the associated racking and labor costs.
5. Cell Technology
Winner: TieBoth panels use HJT (Heterojunction) cell technology. No technology advantage for either product.
Panasonic EverVolt HK 430W
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EverVolt HK delivered 430W using HJT technology with Panasonic's renowned build quality and 25-year warranty.
Pros
- + Japanese engineering quality
- + Excellent HJT temperature coefficient
- + 25-year warranty
- + Strong brand trust
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
Panasonic EVPV400H
DISCONTINUED: Panasonic exited solar manufacturing in 2023. The EVPV400H was Panasonic's standard HJT residential panel, delivering 400W with the brand's signature quality and longevity.
Pros
- + Panasonic reliability
- + HJT advantages
- + Solid 25-year warranty
- + Good all-round performer
Cons
- - DISCONTINUED - no longer manufactured
- - No new units available
- - No ongoing product support
Choose Panasonic EverVolt HK 430W 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 prefer newer cell technology with a longer performance improvement runway
- ✓ No longer available for new installations.
Choose Panasonic EVPV400H If...
- ✓ You prefer newer cell technology with a longer performance improvement runway
- ✓ No longer available for new installations.
Our Recommendation
Both the Panasonic EverVolt HK 430W and Panasonic EVPV400H are excellent solar panel options, and the margin between them is narrow. The Panasonic EverVolt HK 430W wins 2 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, Panasonic EverVolt HK 430W or Panasonic EVPV400H?
The Panasonic EverVolt HK 430W wins this comparison by a narrow margin. It leads in efficiency (22.2% vs 21.2%) and matches or exceeds on warranty (25 vs 25 years). For most residential installations, the Panasonic EverVolt HK 430W is the stronger choice.
Which panel is more efficient, Panasonic EverVolt HK 430W or Panasonic EVPV400H?
The Panasonic EverVolt HK 430W at 22.2% 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 30W per panel under standard test conditions.
Which has a better warranty, Panasonic EverVolt HK 430W or Panasonic EVPV400H?
The Panasonic EverVolt HK 430W comes with a 25-year product warranty and 25-year performance guarantee. The Panasonic EVPV400H offers 25-year product and 25-year performance warranties. Both offer identical warranty terms.
Which panel performs better in hot weather?
The Panasonic EverVolt HK 430W has a temperature coefficient of -0.26%/°C and the Panasonic EVPV400H is -0.26%/°C. Both handle heat equally. A lower (less negative) temperature coefficient is better.
How many Panasonic EverVolt HK 430W vs Panasonic EVPV400H panels do I need for an 8 kW system?
For an 8 kW system: you need 19 Panasonic EverVolt HK 430W panels (430W each) or 20 Panasonic EVPV400H panels (400W each). The Panasonic EverVolt HK 430W requires fewer panels, saving on racking hardware and installation labor.
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Last updated: February 2026