--- title: "Panasonic EVPV420HK2 420W Solar Panel - Specs & Review | ComparePV" description: "Panasonic EVPV420HK2 420W solar panel. Specs: 21.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/panasonic-evpv420hk2" updated: 2026-09-11 --- # Panasonic EVPV420HK2 Middle of its segment, short guarantee 113 panels in the segment HJT 400-450 W ## Identity - **Manufacturer:** Panasonic - **Model:** EVPV420HK2 - **Series:** EVERVOLT Solar Module HK2 Black Series - **Rated power:** 420 W - **Cell technology:** HJT ## How it compares Compared against segment HJT 400-450 W (113 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 420 W | 435 W | Weak - bottom 23% | | | Module efficiency | 21.70% | 22.20% | Weak - bottom 21% | 7,421 | | Power density | 216.5 | 221.6 | Weak - bottom 21% | 7,591 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight (kg) | 21.6 kg | 23.0 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 8% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.70% | 22.20% | Weak - bottom 21% | 7,421 | | Power density | 216.5 | 221.6 | Weak - bottom 21% | 7,591 | | Temperature coefficient | -0.240 | -0.240 | Typical | 13 | | Weight per kWp | 51.4 | 52.4 | Typical | 4,818 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 8% | 9,798 | ### Watch out for - **25 year performance warranty** - Bottom 8% of the HJT 400-450 W segment, against a median of 30 yrs. Ranked 9,798th in the whole database. - **21.70% module efficiency** - Bottom 21% of the HJT 400-450 W segment, against a median of 22.20%. - **216.5 watts per square metre** - Bottom 21% of the HJT 400-450 W segment, against a median of 221.6. - **Best for:** Residential, shaded-installations and hot-climate. - **Not ideal for:** Owners who want a long output guarantee, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 420 W - **Efficiency:** 21.70 % - **Voltage at Pmax (Vmp):** 42.20 V - **Current at Pmax (Imp):** 9.96 A - **Open-circuit voltage (Voc):** 49.10 V - **Short-circuit current (Isc):** 10.74 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.240 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT ### Physical - **Length:** 1865 mm - **Width:** 1040 mm - **Thickness:** 30 mm - **Weight:** 21.6 kg - **Area:** 1.94 m2 - **Power density:** 216.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 92.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.25 % - **Output after 30 years:** 381 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7421 of 14005 | | Power density | 7591 of 14005 | | Temperature coefficient | 13 of 14005 | | Weight | 4818 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Very high efficiency for the segment** - Efficiency of 21.7-22.2% places the series among the top performers in the comparison set - above Silfab Elite (21.9%) and clearly above Boviet GAMMA (19.8%), with EGing STAR Pro (22.02%) roughly comparable. This translates into higher energy yield from the same roof area. - **Low temperature coefficient via HJT** - Heterojunction (HJT) cells give a power temperature coefficient of -0.24%/°C, notably better than the typical -0.29% to -0.35%/°C found in PERC modules and many TOPCon designs. In practice this means smaller power losses on hot days. - **25-year product and power warranty** - Panasonic offers a matching 25-year term for both the product warranty and the power warranty, which is less common than the typical 12/25-year split offered by many competitors. The manufacturer has been in business since 1918, adding credibility to the long-term commitment. - **Half-cut cell design reduces losses** - Half-cut cell construction reduces resistive losses and improves module behavior under partial shading, which matters in typical residential roof installations affected by chimneys or antennas casting shadows. - **Uniform black aesthetics** - The black frame and backsheet give a uniform look without visible grid lines or busbars, a meaningful advantage for premium single-family home installations on highly visible roof sections. ## Cons - **Production discontinued - limited availability** - In April 2025, Panasonic announced its complete exit from the solar and energy storage business, ending production of the EVERVOLT line. The company stated existing warranties would be honored, but new modules from this series are no longer available, and long-term service support and spare parts may be harder to obtain than from manufacturers still active in this segment. ## About this series The Panasonic EVERVOLT Solar Module HK2 Black Series is designed to maximize energy production in situations where every square meter counts. These modules feature a very high efficiency, helping to extract more energy from a limited roof area, which is crucial in many residential installations in Poland. The use of a heterojunction (HJT) technology and a half-cut design minimizes losses and improves performance under real-world conditions, including variable sunlight. A key advantage is the module's **stable performance at high temperatures**, which means it loses less power in the summer compared to many competing solutions. Another advantage is the **low degradation rate**, which translates to more predictable energy production over the long term. Finally, the **uniform, black design** is popular for modern roofs. The HK2 Black Series is a good choice for single-family homes and premium installations, where energy yield, aesthetics, and long-term reliability are priorities. ## Notable figures - At 21.7% efficiency, this panel is on par with typical \*\*HJT 400-450W\*\* modules - At 216.5 W/m², this panel generates 5.1 W/m² less per unit area than \*\*HJT 400-450W\*\* median (221.6 W/m²) - At -0.24%/°C, hot weather performance is typical for \*\*HJT 400-450W\*\* panels - Weight of 21.6 kg (1.4 kg below \*\*HJT 400-450W\*\* median of 23.0 kg) allows easier transport and roof mounting - In the top 53% for efficiency among all HJT panels ## Questions ### What is the efficiency of the Panasonic EVERVOLT HK2 Black Series and what does it mean in practice? The HK2 Black Series modules achieve a module efficiency of 22.2%, placing them among the top-performing residential solar panels available. In practice, this means significantly more energy per square meter of roof space compared to standard PERC modules. For a typical home with limited roof area, this translates into a meaningfully higher system output without requiring additional roof sections. ### What is HJT technology used in the EVERVOLT HK2 Black and why does it matter in summer? HJT (heterojunction technology) combines a crystalline silicon core with amorphous silicon layers, resulting in far better thermal performance. The HK2 Black's temperature coefficient is just -0.24%/°C — among the lowest available. On a hot summer day when a roof reaches 60-70°C, this panel loses significantly less power than standard PERC modules rated at around -0.35%/°C, resulting in measurably higher energy yields during peak sunshine months. ### What warranty does the Panasonic EVERVOLT HK2 Black Series carry? Panasonic provides a 25-year product warranty and a 25-year power output warranty. Annual degradation is specified at just 0.25%, meaning the module should retain at least 92% of its original rated power after 25 years. This is one of the strongest degradation guarantees in the premium panel segment and a key factor when calculating long-term return on investment. ### Is the Panasonic EVERVOLT HK2 Black Series still available for purchase? No. Panasonic officially exited the solar module business in 2025, discontinuing the entire EVERVOLT lineup including the HK2 Black Series. Any remaining availability is limited to existing distributor or installer inventory. Before purchasing, buyers should confirm current stock levels with their supplier and verify warranty service conditions following Panasonic's exit from the solar market. ### Do the EVERVOLT HK2 Black panels fit a standard pitched roof and how do they look after installation? The module measures 1865×1040×30 mm and weighs 21.6 kg, which is well within the standard range for pitched-roof residential installations. The all-black frame and black half-cut cells create a uniform, sleek appearance popular on modern homes and premium builds. Mounting is compatible with standard aluminum rail systems widely available on the market. ### Are the Panasonic EVERVOLT HK2 Black Series modules bifacial? No, the HK2 Black Series is a monofacial module — it generates power from the front side only. This is intentional for roof-mounted installations where the rear face is covered by the racking structure. The HJT cell technology combined with a 132 half-cut cell layout compensates for the lack of bifaciality by delivering high efficiency and strong shading tolerance without requiring ground-reflected irradiance. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/evpv-430-420hk2-ds-14d20fdcd6fc.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | Hotter, +2.1 pp, +5 yr warranty | | [Luxor Solar LX-465M/182R-96+ GG](https://comparepv.com/panel/luxor-lx-465m-182r-96-gg) | 465 W | +45 W, +2.1 pp, +5 yr warranty | | [Maxeon SPR-MAX7-470](https://comparepv.com/panel/maxeon-spr-max7-470) | 470 W | +50 W, +2.0 pp, +15 yr warranty | | [AIKO AIKO-A470-MAH54Mb](https://comparepv.com/panel/aiko-aiko-a470-mah54mb) | 470 W | +50 W, +1.9 pp, +5 yr warranty | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | Hotter, +1.9 pp, +5 yr warranty | | [TCL Zhonghuan HSM-BD54-LA470](https://comparepv.com/panel/tcl-zhonghuan-hsm-bd54-la470) | 470 W | +50 W, +1.9 pp, +5 yr warranty | | [Panasonic EVPV430HK2](https://comparepv.com/panel/panasonic-evpv430hk2) | 430 W | +10 W, +0.5 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +90 W, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +85 W, +3.0 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +80 W, +2.8 pp, +5 yr warranty | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +80 W, +2.8 pp, +5 yr warranty | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | +80 W, +2.8 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/panasonic-evpv420hk2 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.