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Panasonic Brand review

EVPV390H

390 Wp HJT
ComparePV verdict

Light for its output, weak in heat

Rank 10,480 of 14,005
Compare panels Datasheet PDF
Power (Wp)
390
Strong · top 19%
Efficiency (%)
21.10
Typical · median 20.90%
Density (Wp/m²)
210.8
Typical · median 209.3
Temp (%/°C)
-0.260
Weak · bottom 9%
Weight (kg)
20.5
Strong · 2.3 kg below median
Warranty (yrs)
25
Weak · bottom 19%

The Panasonic EVERVOLT Solar Module (390H) series is designed for maximum energy yield in situations where every square meter of roof space matters. A key advantage is the HJT heterojunction cell technology in a half-cut configuration, which minimizes losses and stabilizes module performance in real-world conditions, not just in a laboratory. This translates to improved performance at high temperatures, which is particularly important in summer and on roofs with poor ventilation, where standard panels often lose efficiency.

Another distinguishing feature of the series is high resistance to LID and PID degradation thanks to the use of n-type cells, which is important for investors who expect predictable performance from their solar installations over many years. The modules have been optimized for performance under partial shading, which is helpful in typical Polish installations with chimneys, skylights, or trees.

This is a good choice for single-family homes and small businesses that want to maximize energy production from a limited area, and also for improved stability compared to many traditional PERC modules.

Ranking

45 panels in the segment HJT 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 21.10% 20.90% Typical 9,297
Power density 210.8 209.3 Typical 9,551
Temperature coefficient -0.260 -0.259 Weak · bottom 9% 511
Weight per kWp 52.6 59.2 Strong · top 24% 6,190
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

6 positive · 5 caution
Best for

Residential, commercial, shaded-installations and hot-climate.

Not ideal for

Hot climates and owners who want a long output guarantee.

Strengths
52.6 kg per kWp

Top 24% of the HJT 350-400 W segment, against a median of 59.2.

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
Low 0.26%/°C temperature coefficient

N-type HJT technology delivers a power temperature coefficient of 0.26%/°C, notably better than the typical 0.35-0.40%/°C seen in conventional PERC modules. This translates into higher real-world yield during summer and on poorly ventilated roof arrays.

Very low annual degradation (0.25%/year)

The manufacturer guarantees at least 92% of rated power after 25 years, corresponding to an annual degradation rate of roughly 0.25% - well below the 0.45-0.55%/year typical of PERC modules. This provides a more predictable energy yield over the investment's lifetime.

Competitive 21.1% efficiency

At 21.1% efficiency, the series is on par with Meyer Burger Glass (21.2%) and ahead of JA Solar JAM60S21 (21.0%), meaning a smaller module footprint per kWp at the same 390 Wp rating.

Consistent 25-year product and power warranty

Panasonic backs the module with a 25-year warranty covering both the product and power output - unlike many Tier-1 manufacturers that offer a shorter product warranty (10-12 years) alongside a 25-year power guarantee. This simplifies claims in the event of a defect.

LID and PID resistance from n-type cells

N-type cells eliminate the Light Induced Degradation typical of PERC panels and limit Potential Induced Degradation, resulting in more stable output in the first years of operation and under partial shading.

Trade-offs
Production discontinued - Panasonic exited solar

The EVERVOLT series (including the 390H variant) has been discontinued, and Panasonic announced in 2025 a full exit from the global solar and energy storage business. Despite pledges to honor existing warranties, long-term availability of spare parts and service support remains uncertain.

Efficiency trails the top peer comparable

At 21.1% efficiency, the series falls slightly behind Phono Solar Twinplus M4-9B-R (21.3%) - a small 0.2 pp gap, but in the premium HJT/mono segment every tenth of a percent per square meter of roof matters.

No bifacial variant available

The module is not offered in a bifacial configuration, which with suitable mounting (e.g., on high-albedo racking) can add 5-15% extra yield - some competing HJT series on the market already offer double-sided variants.

Notes from the database
  • Efficiency of 21.1% matches the HJT 0-400W median
  • At 210.8 W/m² power density, this panel generates 4.4 W/m² more per unit area than HJT 0-400W median (206.4 W/m²)
  • Temperature coefficient of -0.26%/°C matches the HJT 0-400W median
  • At 20.5 kg, weight matches the HJT 0-400W median
  • #9297 for efficiency, #511 for temperature performance out of 14005 panels

Specifications

Open datasheet PDF
Nominal power (Pmax) 390 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 21.10 % Typical Segment median 20.90%
Vmpp · Impp 41.50 V · 9.40 A Operating point at max power
Voc · Isc 48.60 V · 10.19 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1821×1016×30 mm · 1.85 m² of roof
Weight 20.5 kg Strong Strong · 2.3 kg below median
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 354 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 390 Wp appear here. The rest cover the whole series.

Performance Warranty Performance Warranty Whole series Dependence on Irradiance Dependence on Irradiance 390 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 EVPV390H 390 W 21.10% -0.260 20.5 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg +50 W, +2.0 pp, +5 yr warranty
GKA210M340W 340 W 23.00% - 16.2 kg -50 W, +1.9 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +1.9 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +1.9 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg Lighter, +1.9 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg Lighter, +1.9 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +1.9 pp, +5 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +50 W, +1.8 pp, +5 yr warranty
EVPV400H 400 W 21.60% -0.260 20.5 kg +10 W, +0.5 pp
EVPV410H 410 W 22.20% -0.260 20.5 kg +20 W, +1.1 pp
SPR-MAX7-475 475 W 24.00% -0.270 21.1 kg +85 W, +2.9 pp, +15 yr warranty
SPR-MAX7-470 470 W 23.70% -0.270 21.1 kg +80 W, +2.6 pp, +15 yr warranty
SPR-MAX7-465 465 W 23.50% -0.270 21.1 kg +75 W, +2.4 pp, +15 yr warranty
SPR-MAX6-440 440 W 22.80% -0.290 20.9 kg +50 W, +1.7 pp, +15 yr warranty
JT435SYk(B) 435 W 22.70% -0.240 23.0 kg +45 W, +1.6 pp, +5 yr warranty
SPR-MAX3-430-R 430 W 22.70% -0.270 21.2 kg +40 W, +1.6 pp, +15 yr warranty

Found 6 panels of the same or similar size to this one, within ±10 mm. See them here Found 10 panels of the same or similar size to this one, within ±25 mm. See them here Found 86 panels of the same or similar size to this one, within ±50 mm. See them here Found 532 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
Is the Panasonic EVERVOLT 390H series still available for purchase?
The EVERVOLT 390H series has been discontinued. In April 2025, Panasonic announced it was exiting the solar panel and energy storage market entirely. No new modules are being manufactured, although some distributors may still carry limited stock. Panasonic has stated it will honor all warranties for previously installed and purchased units.
What is HJT technology in the EVERVOLT 390H and is it worth the premium?
HJT (heterojunction) combines a crystalline silicon wafer with amorphous silicon layers, resulting in a low temperature coefficient (approx. -0.26%/°C vs. -0.35 to -0.40%/°C for standard PERC), higher efficiency, and strong resistance to LID and PID degradation thanks to n-type cells. In practice this means better summer output and more predictable long-term energy yield compared to conventional PERC modules.
How do the Panasonic EVERVOLT 390H panels perform in high-temperature conditions?
High-temperature performance is one of the series' main advantages. With a temperature coefficient of approximately -0.26%/°C, the EVERVOLT 390H loses significantly less power as the roof heats up compared to standard PERC panels. When cell temperature reaches 65°C, power loss is roughly 10% versus 15-16% for typical PERC competitors. On poorly ventilated roofs this translates to meaningfully higher annual energy output.
What warranty coverage comes with the Panasonic EVERVOLT 390H?
Panasonic offered a 25-year product warranty and a 25-year power output warranty for this series. Despite its exit from the solar market in 2025, Panasonic has committed to honoring both warranties for all installed and registered systems. Before purchasing remaining stock from a distributor, confirm that the specific units are properly registered and clarify what after-sales support the seller provides.
Are the EVERVOLT 390H panels suitable for roofs with chimneys or dormers?
Yes. The half-cut cell layout (132 cells) limits the impact of partial shading on overall module output — a shaded section does not suppress production from the remaining cells as severely as in a conventional 60-cell module. The EVERVOLT 390H handles the partial shading conditions typical of Polish residential installations — chimneys, dormers, and nearby trees — better than standard full-cell designs.
How do the EVERVOLT 390H panels compare to standard PERC modules?
Key differences: cell technology (n-type HJT vs. p-type PERC), lower temperature coefficient (better hot-weather output), greater resistance to LID and PID degradation, and generally higher efficiency per square meter. The trade-offs are a higher purchase price and, following Panasonic's market exit, limited ongoing availability. Investors seeking comparable performance should consider HJT or TOPCon modules from other manufacturers currently active in the market.
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