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Panasonic Brand review

EVPV370K

370 Wp HJT
ComparePV verdict

Middle of its segment, weak in heat

Rank 10,799 of 14,005
Compare panels Datasheet PDF
Power (Wp)
370
Weak · bottom 24%
Efficiency (%)
21.20
Typical · median 20.90%
Density (Wp/m²)
211.6
Typical · median 209.3
Temp (%/°C)
-0.260
Weak · bottom 9%
Weight (kg)
19.5
Typical · median 22.8 kg
Warranty (yrs)
25
Weak · bottom 19%

The Panasonic EVERVOLT Solar Module Black Series 370K/360K is designed to maximize energy generation from a limited roof area, without compromising the aesthetics of the installation. A key advantage is the combination of half-cut cells with heterojunction technology (HJT), which results in more stable module performance in challenging conditions and lower losses over time. In practice, this translates to a real benefit for the investor: improved performance on hot days thanks to excellent high-temperature performance, and greater predictability of energy production year after year due to low power degradation over time.

This solution is particularly well-suited for residential installations in Poland - both on roofs with complex geometries and where the elegant appearance of the modules is important. In addition, the series offers a 25-year warranty, which makes it easier to plan costs and reduces the risk of service issues over the long term.

Ranking

45 panels in the segment HJT 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.20% 20.90% Typical 9,076
Power density 211.6 209.3 Typical 9,189
Temperature coefficient -0.260 -0.259 Weak · bottom 9% 511
Weight per kWp 52.7 59.2 Typical 6,344
Performance warranty 25 yrs 30 yrs Weak · bottom 19% 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

5 positive · 3 caution
Best for

Residential, shaded-installations and hot-climate.

Not ideal for

Hot climates and owners who want a long output guarantee.

Watch-outs
-0.260 %/°C temperature coefficient

Bottom 9% of the HJT 350-400 W segment, against a median of -0.259. Ranked 511th in the whole database.

25 year performance warranty

Bottom 19% of the HJT 350-400 W segment, against a median of 30 yrs.

What owners get
Highest efficiency in the segment

At 21.2% efficiency, this module clearly outperforms comparable 370 Wp panels — Solitek SOLID Bifacial (19.57%), Solarwatt Panel vision GM 3.0 (19.9%), and Selfa SV120M.3.2 (20.3%). This means higher energy yield from the same roof area.

HJT technology with a low temperature coefficient

The combination of half-cut cells and heterojunction (HJT) technology delivers a power temperature coefficient of 0.26%/°C, one of the best on the market. In practice this means lower production losses on hot days compared to conventional PERC cells (typically 0.35–0.40%/°C).

Very low power degradation

The module loses only 2% of power in the first year, followed by just 0.25% annual degradation, guaranteeing a minimum of 92% of nominal power after 25 years of operation. This ensures more predictable energy yields over the long-term investment horizon.

Comprehensive 25-year warranty

The AllGuard/TripleGuard program covers product, power performance, and parts and labor simultaneously for 25 years — a much broader coverage scope than the standard 10-12 year product warranty offered by many tier-2 manufacturers.

Aesthetic all-black design for complex roofs

The uniform black finish (Black Series), combined with high power output on a compact footprint, works well on complex, sloped roof geometries typical of Polish residential installations.

Trade-offs
Production discontinued in 2025

Panasonic announced on April 28, 2025, a complete exit from the PV module and energy storage market, ending the EVERVOLT line. While the company stated it would continue warranty support for existing installations, long-term availability of replacement parts and after-sales service is more limited compared to manufacturers still actively operating in the market.

Notes from the database
  • 21.2% module efficiency - 0.6pp better than the HJT 0-400W median of 20.6%
  • Power density of 211.6 W/m² packs 5.2 W/m² more into the same footprint vs HJT 0-400W median (206.4 W/m²)
  • At -0.26%/°C, hot weather performance is typical for HJT 0-400W panels
  • Weight of 19.5 kg (2.0 kg below HJT 0-400W median of 21.5 kg) allows easier transport and roof mounting
  • Ranked #9076 out of 14005 panels for efficiency in the database

Specifications

Open datasheet PDF
Nominal power (Pmax) 370 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.20 % Typical Segment median 20.90%
Vmpp · Impp 37.40 V · 9.90 A Operating point at max power
Voc · Isc 44.10 V · 10.55 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1721×1016×30 mm · 1.75 m² of roof
Weight 19.5 kg Typical Typical · median 22.8 kg
Coefficient Pmax -0.260 %/°C Weak bottom 9% 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 19% · median 30 yrs
End-of-warranty output 92.0 % Equals 336 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 370 Wp appear here. The rest cover the whole series.

Performance Warranty Performance Warranty Whole series Dependence on Irradiance Dependence on Irradiance 370 W

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
-0.260 %/°C against a segment median of -0.259
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Panasonic EVPV370K 370 W 21.20% -0.260 19.5 kg You are here
NS-330MH-80 330 W 23.15% -0.290 15.0 kg -40 W, lighter, +1.9 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg -40 W, lighter, +1.9 pp
GKA210M320W 320 W 23.00% - 16.2 kg -50 W, +1.8 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg Lighter, +1.8 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +1.8 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +1.8 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg +30 W, +1.8 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg +30 W, +1.8 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +1.8 pp, +5 yr warranty
SPR-MAX3-400-COM 400 W 22.60% -0.270 19.0 kg +30 W, +1.4 pp, +15 yr warranty
EVPV350K 350 W 20.00% -0.260 19.5 kg -20 W, -1.2 pp
EVPV360 360 W 20.60% -0.260 19.5 kg -10 W, -0.6 pp
EVPV380 380 W 21.70% -0.260 19.5 kg +10 W, +0.5 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +70 W, +1.7 pp, +5 yr warranty
MS440N-DHBA 440 W 22.73% -0.290 22.0 kg +70 W, +1.5 pp, +5 yr warranty
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +65 W, +1.5 pp, +5 yr warranty

Found 6 panels of the same or similar size to this one, within ±10 mm. See them here Found 65 panels of the same or similar size to this one, within ±25 mm. See them here Found 443 panels of the same or similar size to this one, within ±50 mm. See them here Found 865 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Panasonic EVERVOLT Black Series 370K/360K still available for purchase?
No, the EVERVOLT Black Series 370K/360K has been discontinued. Panasonic exited the solar panel market and no longer manufactures these modules. Limited stock may still be found with select distributors, but availability is not guaranteed. Panasonic continues to honor previously issued warranties, though future service or replacement may be more difficult to arrange as the product line is no longer supported commercially.
What is HJT technology in the Panasonic EVERVOLT 370K and why is it better than PERC?
HJT (heterojunction technology) combines crystalline silicon with thin amorphous silicon layers, significantly reducing recombination losses at the cell surface. The result is module efficiency exceeding 21% for the 370K model, superior performance in heat, and an annual degradation rate of approximately 0.25%, compared to 0.45–0.55% typical of PERC cells. Over a 25-year system lifetime, this translates to meaningfully more total energy yield per installed watt.
How much power do the EVERVOLT Black Series 370K panels lose at high temperatures in summer?
The 370K series has a temperature coefficient of just -0.26%/°C, among the best in the industry. When module temperature reaches 70°C under real summer conditions, the 370K loses roughly 13% of its rated output, while a standard PERC panel would lose 18–20%. This low temperature coefficient directly boosts energy production on hot, sunny days and improves the overall LCOE of the installation.
What warranty does the Panasonic EVERVOLT 370K/360K come with and what does it cover?
The EVERVOLT Black Series 370K/360K carries both a 25-year product warranty covering manufacturing defects and a 25-year power output warranty guaranteeing at least 92% of rated power after 25 years of operation. Because Panasonic has exited the solar market, buyers should confirm warranty claim procedures with their regional distributor or Panasonic's designated service partner before purchasing remaining stock.
Are the Panasonic EVERVOLT Black Series 370K panels suitable for pitched roofs with partial shading?
Yes. The 370K/360K series uses half-cut cell technology, which splits each cell into two independent sections and reduces mismatch losses caused by partial shading from chimneys, dormers, or neighboring objects. The all-black Black Series frame and backsheet also make these modules an attractive choice for residential pitched roofs. For severe or persistent shading, pairing the panels with power optimizers or microinverters is still recommended.
How slowly do the Panasonic EVERVOLT 370K modules degrade over time, and what does the manufacturer guarantee?
The 370K series carries an annual degradation rate of approximately 0.25%, one of the lowest available in the residential PV market. After 25 years, the panels retain roughly 93–94% of rated power, with Panasonic guaranteeing a minimum of 92%. Standard PERC modules typically degrade at 0.45–0.55% per year. Lower degradation directly reduces lifetime LCOE and improves the predictability of annual energy yield for system owners and financiers.
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