| Published power range | 420–430 W |
| Scored benchmark | 430 W |
| Cell architecture | Heterojunction (HJT) |
| Module efficiency | 22.2% |
| Temp. coefficient Pmax | -0.24 %/°C |
| First-year degradation | 1% |
| Annual degradation | 0.25 %/yr |
| Product warranty | 25 yr |
| Performance warranty | 25 yr |
| Encapsulation | Glass-backsheet (standard or unspecified backsheet) |
| Energy yield test result | Not independently yield-tested |
| Reliability testing | Not independently tested |
| Carbon footprint / EPD | EPD published (intensity disclosed, not low-carbon certified) |
| Hail resistance | IEC 61215 standard (25mm) |
Some values are estimated where independent verification was not available: see the full scorecard and review.solar/terms.
EverVolt HK2 · every criterion scored by the historical rubric (panel v2.5.0 (historical assessment, frozen 2026-07-05)), with its recorded value, evidence status, and any linked source. Page 1 carries the buying-decision summary; this and the next page are the full record for verification and right of reply.
| Architecture & Design | |||
| Cell architecture | Heterojunction (HJT) | est. | No link |
| Encapsulation & frame construction | Glass-backsheet (standard or unspecified backsheet) | est. | No link |
| Contact | Advanced MBB | est. | No link |
| Fire classification (IEC 61730) | Certified | stated | No link |
| Awards | Not Listed | est. | No link |
| Efficiency & Yield | |||
| Module efficiency (%) | 22.2 | est. | No link |
| Independent energy yield | Not independently yield-tested | est. | No link |
| Temp coefficient Pmax (%/C) | -0.24 | datasheet | No link |
| NOCT (C) | 43 | est. | No link |
| Low-light / IAM coefficient | Low-light performance stated by manufacturer | est. | No link |
| Power tolerance (%) | 3 | est. | No link |
| Durability (verified) | |||
| Verified reliability | Not independently tested | est. | No link |
| Positive loading (MQT16, Pa) | 7000 | stated | No link |
| Negative loading (MQT16, Pa) | 4000 | stated | No link |
| PID (IEC TS 62804) | Independently tested / certified | stated | No link |
| Salt mist (IEC 61701) | Severity 1 | stated | No link |
| Hail resistance | IEC 61215 standard (25mm) | est. | No link |
review.solar · audit sheet · panel v2.5.0 (historical assessment, frozen 2026-07-05) · https://review.solar/cards/panasonic-panasonic-evervolt-hk2-hjt-cautionary-exited-solar
EverVolt HK2 · continued from page 2 · Solar Analytica rubric panel v2.5.0 (historical assessment, frozen 2026-07-05).
| Performance & Degradation | |||
| Guaranteed end-of-warranty output (%) | 92.0 | est. | No link |
| First-year degradation (%) | 1.0 | est. | No link |
| Annual degradation (%/yr) | 0.25 | est. | No link |
| Performance guarantee period (yrs) | 25 | est. | No link |
| Guarantee & Backbone | |||
| Guarantee period (yrs) | 25 | est. | No link |
| Guarantee assurance | Parts, Service & Transport | datasheet | No link |
| Warranty transferability | Transferable (buyer registration required within grace period) | est. | No link |
| Financial strength & warranty backing | Stable / listed | est. | No link |
| Manufacturing track record | 15+ years, field-proven | est. | No link |
| Sustainability | |||
| Carbon footprint / EPD | EPD published (intensity disclosed, not low-carbon certified) | est. | No link |
| End-of-life & recycling disclosure | Take-back or recycling program published | stated | No link |
review.solar · audit sheet · panel v2.5.0 (historical assessment, frozen 2026-07-05) · https://review.solar/cards/panasonic-panasonic-evervolt-hk2-hjt-cautionary-exited-solar