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Heckert Solar NeMo® 4.2 80 M BLACK 390
Heckert Solar Brand review

NeMo® 4.2 80 M BLACK 390

390 Wp PERC
ComparePV verdict

Strong in heat, no clear weak spot

Rank 12,180 of 14,005
Compare panels Datasheet PDF
Power (Wp)
390
Typical for its class
Efficiency (%)
20.10
Typical · median 19.90%
Density (Wp/m²)
200.2
Typical · median 199.0
Temp (%/°C)
-0.340
Strong · top 15%
Weight (kg)
21.0
Typical · median 21.4 kg
Warranty (yrs)
25
Typical · median 25 yrs

The Heckert Solar NeMo® 4.2 80 M BLACK series consists of monocrystalline modules designed to combine high performance with the aesthetics of modern installations. It utilizes an 80-cell configuration and a Querstring design, which reduces stress in the cell connection area - effectively minimizing the risk of micro-cracks and helping to maintain stable performance over the long term, especially in demanding mounting conditions.

For designers and installers, the lower operating current is also an important feature, allowing the modules to be used in shorter strings and easily integrated with inverters and optimization solutions. This series utilizes PERC technology and laser-prepared cells, which supports consistent performance and resistance to loads.

The BLACK version with a black frame looks particularly good on residential roofs, commercial buildings, and structures with high aesthetic requirements - without compromising durability and reliability.

Ranking

579 panels in the segment PERC 350-400 W
Metric This panel Median Position in segment Overall rank
Module efficiency 20.10% 19.90% Typical 12,102
Power density 200.2 199.0 Typical 12,179
Temperature coefficient -0.340 -0.350 Strong · top 15% 8,778
Weight per kWp 53.8 55.8 Typical 7,897
Performance warranty 25 yrs 25 yrs Typical 9,798
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

6 positive · 3 caution
Best for

Residential, commercial and shaded-installations.

Strengths
-0.340 %/°C temperature coefficient

Top 15% of the PERC 350-400 W segment, against a median of -0.350.

What owners get
Manufactured exclusively in Germany

Heckert Solar produces modules at its Chemnitz and Langenwetzendorf (opened 2021) plants with a combined capacity of 800 MWp/year. Each module undergoes approximately 60 quality and safety tests, carries VDE certification, and the brand has continuously won the Top Brand PV award (EuPD Research) every year since 2015 — one of the longest uninterrupted streaks among European PV manufacturers.

Querstring design – lower IMPP, fewer microcracks

The 80 half-cut cell layout in cross-string (Querstring) configuration reduces operating current (IMPP) to ~8.52 A (395 Wp variant) versus ~10 A typical for conventional 108-cell G1 modules at equivalent power. Lower current reduces thermomechanical stress at cell interconnections, while a crosslinking rate >80% (extended lamination cycle) inhibits moisture ingress and improves microcrack resistance during installation and long-term operation.

High mechanical rating and IP68 connectors

Certified for snow load of 5,400 Pa and wind load of 2,400 Pa, exceeding the standard IEC 61215 requirement of 2,400/2,400 Pa. Anti-reflective coated 3.2 mm ESG glass combined with Stäubli MC4 IP68 connectors ensures reliable sealing on pitched rooftops exposed to driving rain and condensation.

20.1–20.8% efficiency — top of the segment

The best-in-series 405 Wp variant achieves 20.8% module efficiency, exceeding all direct peer comparables: EGing PV STAR Series (20.74%), VSUN405-108BMH-DG (20.74%), and Goldi Solar GS10-M108-BF (20.66%). The series leads the peer group on efficiency without sacrificing mechanical or electrical specifications.

All-black aesthetics without durability trade-offs

Black anodized aluminum frame and black backsheet deliver a uniform appearance on pitched roofs, facades, and carports. Unlike many budget full-black modules, this series maintains full mechanical certification and standard frame corrosion protection, avoiding the durability compromises sometimes associated with all-black aesthetics.

Trade-offs
PERC technology — outpaced by TOPCon

P-type PERC cells exhibit annual degradation of 0.5–0.7%/year versus 0.4–0.5%/year for N-type TOPCon and are susceptible to LID (Light-Induced Degradation) from boron-oxygen defects. Heckert Solar itself launched an N-type TOPCon series in 2025 with a 30-year product warranty, clearly signaling that the NeMo 4.2 80 M is a previous-generation product — a relevant consideration for systems designed to operate 25+ years.

Monofacial only — limited energy yield upside

The series is monofacial (is_bifacial: false), while direct peer VSUN405-108BMH-DG features a dual-glass (DG) construction that enables bifacial gain of an estimated 5–15% in ground-mounted and carport applications with reflective ground surfaces. For dark-surface pitched rooftops the difference is negligible, but for utility-scale and agri-PV projects this represents a concrete competitive disadvantage.

European manufacturer price premium

German production incurs significantly higher BoS costs than peer comparables manufactured in China (EGing PV, Goldi Solar, VSUN). Market data from inutec-int.com indicates approximately €104.78/module for the 395 Wp variant (April 2024, ~€265/kWp), while comparable Chinese Tier-1 PERC modules were available below €200/kWp in the same period — a CAPEX premium of roughly 25–35% that adversely affects LCOE in larger projects.

Notes from the database
  • 20.1% module efficiency - 0.7pp better than the PERC 0-400W median of 19.4%
  • Power density of 200.2 W/m² packs 5.8 W/m² more into the same footprint vs PERC 0-400W median (194.4 W/m²)
  • Temperature coefficient of -0.34%/°C matches the PERC 0-400W median
  • #12102 for efficiency, #8778 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 20.10 % Typical Segment median 19.90%
Vmpp · Impp 46.25 V · 8.48 A Operating point at max power
Voc · Isc 54.33 V · 8.96 A Sizes the string length
Max system voltage 1000 V Longer strings than 1000 V modules
Dimensions 1736×1122×35 mm · 1.95 m² of roof
Weight 21.0 kg Typical Typical · median 21.4 kg
Cells 80 · PERC Monocrystalline
Coefficient Pmax -0.340 %/°C Strong top 15% of its segment
Coefficient Voc · Isc -0.262 · 0.037 %/°C
Product warranty 15 years Hardware defects only
Performance warranty 25 years Typical median 25 yrs · median 25 yrs
End-of-warranty output 80.0 % Equals 297 W guaranteed

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
-0.340 %/°C against a segment median of -0.350
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Heckert Solar NeMo® 4.2 80 M BLACK 390 390 W 20.10% -0.340 21.0 kg You are here
LX-440M/182-108+GG 440 W 23.07% -0.240 23.6 kg +50 W, cooler, +3.0 pp
GKA210M340W 340 W 23.00% - 16.2 kg -50 W, +2.9 pp, +5 yr warranty
GKA210M360W 360 W 23.00% - 16.2 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M380W (1/4*4*38) 380 W 23.00% - 17.1 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M400W (1/2*4*20) 400 W 23.00% - 18.0 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M400W (1/4*4*40) 400 W 23.00% - 18.0 kg Lighter, +2.9 pp, +5 yr warranty
GKA210M380W (1/2*4*19) 380 W 23.00% - 17.1 kg Lighter, +2.9 pp, +5 yr warranty
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +50 W, cooler, +2.8 pp
NEMO® 4.1 80 M 385 385 W 19.80% -0.343 21.0 kg -0.3 pp
NeMo® 4.2 80 M 390 392 W 20.10% -0.340 21.0 kg Very close match
LR7-54HJD-510M 510 W 25.00% -0.240 23.5 kg +120 W, cooler, +4.9 pp
AIKO-A495-MCE54Mw 495 W 24.80% -0.260 21.0 kg +105 W, cooler, +4.7 pp
LR7-54HJD-505M 505 W 24.70% -0.240 23.5 kg +115 W, cooler, +4.6 pp
AIKO-A490-MCE54Mw 490 W 24.50% -0.260 21.0 kg +100 W, cooler, +4.4 pp
LR7-54HJD-500M 500 W 24.50% -0.240 23.5 kg +110 W, cooler, +4.4 pp
CIPRO-TN9C54M-500W 500 W 24.50% -0.260 21.4 kg +110 W, cooler, +4.4 pp

Found 56 panels of the same or similar size to this one, within ±10 mm. See them here Found 1942 panels of the same or similar size to this one, within ±25 mm. See them here Found 3396 panels of the same or similar size to this one, within ±50 mm. See them here Found 3974 panels of the same or similar size to this one, within ±100 mm. See them here

Common questions

6 answered
What warranty does the Heckert Solar NeMo® 4.2 80 M BLACK come with?
The NeMo® 4.2 80 M BLACK series carries a 15-year product warranty covering material and workmanship defects, plus a 25-year linear power output warranty. After 25 years of operation the module is guaranteed to retain at least 80% of its nominal power. Both warranties are backed by Heckert Solar, headquartered in Germany, providing a reliable and long-term service foundation.
What is the Querstring design in the NeMo® 4.2 80 M BLACK modules and why does it matter?
Querstring refers to a specific interconnection layout that reduces mechanical stress at cell soldering points. This lowers the risk of microcracks during transport, installation, and long-term operation – especially on rooftops subject to vibration or rapid temperature swings. The practical result is more stable and predictable energy output throughout the system's service life.
What is the peak power output and module efficiency of the Heckert Solar NeMo® 4.2 80 M BLACK?
The top variant in the series reaches a peak power of 405 Wp under standard test conditions (STC), with a module efficiency of approximately 20.3%. The series spans 390–405 Wp, allowing installers to match panel count to available roof area and target annual yield. For a black-frame PERC module in the premium residential segment, those figures are highly competitive.
Are the NeMo® 4.2 80 M BLACK panels compatible with popular inverters and power optimizers?
Yes. The relatively low operating current – Impp around 8.5 A – makes the NeMo® 4.2 80 M BLACK well-suited for inverters requiring shorter strings and for use with power optimizers. Lower current also reduces DC cable losses and simplifies wire sizing. The series is compatible with inverters from SMA, Fronius, Huawei, and other brands with standard MPPT inputs.
Does the PERC technology in the NeMo® 4.2 80 M BLACK improve performance under low-light conditions typical of Central European winters?
Yes. PERC (Passivated Emitter and Rear Cell) technology improves light absorption through rear-surface passivation, resulting in better yields under diffuse irradiance and overcast skies – common in Central and Northern Europe during autumn and winter. In this series, the PERC cells are also laser-processed, which enhances parameter consistency and long-term resistance to degradation.
Is the Heckert Solar NeMo® 4.2 80 M BLACK suitable for a pitched residential roof, and how does it look after installation?
Yes. At 1736×1122×35 mm and approximately 21 kg, the module fits standard roof mounting structures without additional load-bearing reinforcement. The black anodized aluminum frame creates a uniform, low-profile look on the roof surface – eliminating the visible silver border typical of standard modules. This makes the series particularly popular for modern residential builds and projects with elevated aesthetic requirements.
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