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Panasonic Brand review

EVPV420HK2

420 Wp HJT
ComparePV verdict

Middle of its segment, short guarantee

Rank 9,335 of 14,005
Compare panels Datasheet PDF
Power (Wp)
420
Weak · bottom 23%
Efficiency (%)
21.70
Weak · bottom 21%
Density (Wp/m²)
216.5
Weak · bottom 21%
Temp (%/°C)
-0.240
Typical · median -0.240
Weight (kg)
21.6
Typical · median 23.0 kg
Warranty (yrs)
25
Weak · bottom 8%

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.

Ranking

113 panels in the segment HJT 400-450 W
Metric This panel Median Position in segment Overall 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
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 4 caution
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.

Watch-outs
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.

What owners get
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.

Trade-offs
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.

Notes from the database
  • 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

Specifications

Open datasheet PDF
Nominal power (Pmax) 420 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.70 % Weak Segment median 22.20%
Vmpp · Impp 42.20 V · 9.96 A Operating point at max power
Voc · Isc 49.10 V · 10.74 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1865×1040×30 mm · 1.94 m² of roof
Weight 21.6 kg Typical Typical · median 23.0 kg
Coefficient Pmax -0.240 %/°C Typical median -0.240 of its segment
Coefficient Voc · Isc -0.240 · 0.040 %/°C
NOCT 44 °C At 800 W/m², 20 °C ambient
Product warranty 25 years Hardware defects only
Performance warranty 25 years Weak bottom 8% · median 30 yrs
End-of-warranty output 92.0 % Equals 381 W guaranteed
Degradation 2.00 → 0.25 % First year, then annual

Datasheet charts

Open datasheet PDF

Measured curves published by Panasonic in this model's datasheet. A chart carrying a wattage was measured on that variant alone - only the ones that describe 420 Wp appear here. The rest cover the whole series.

Performance Warranty Performance Warranty Whole series

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.240 %/°C against a segment median of -0.240
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Panasonic EVPV420HK2 420 W 21.70% -0.240 21.6 kg You are here
JST-EDMH-(445-465)W-TD (465W class) 465 W 23.81% -0.300 20.5 kg Hotter, +2.1 pp, +5 yr warranty
LX-465M/182R-96+ GG 465 W 23.80% -0.260 23.5 kg +45 W, +2.1 pp, +5 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +50 W, +2.0 pp, +15 yr warranty
AIKO-A470-MAH54Mb 470 W 23.60% -0.260 21.5 kg +50 W, +1.9 pp, +5 yr warranty
AIKO-A460-MAH54Mb 460 W 23.60% -0.290 20.5 kg Hotter, +1.9 pp, +5 yr warranty
HSM-BD54-LA470 470 W 23.60% -0.260 21.5 kg +50 W, +1.9 pp, +5 yr warranty
EVPV430HK2 430 W 22.20% -0.240 21.6 kg +10 W, +0.5 pp
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +90 W, +3.3 pp, +5 yr warranty
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +85 W, +3.0 pp, +5 yr warranty
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +80 W, +2.8 pp, +5 yr warranty
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +80 W, +2.8 pp, +5 yr warranty
GK-3-54HGb-500M 500 W 24.50% -0.260 21.4 kg +80 W, +2.8 pp, +5 yr warranty

Found 9 panels of the same or similar size to this one, within ±10 mm. See them here Found 43 panels of the same or similar size to this one, within ±25 mm. See them here Found 96 panels of the same or similar size to this one, within ±50 mm. See them here Found 1916 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
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.
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