Skip to main content
Heckert Solar NeMo 4.2 80M 390
Heckert Solar Brand review

NeMo 4.2 80M 390

390 Wp Monocrystalline
ComparePV verdict

Middle of its segment, short guarantee

Rank 12,180 of 14,005
Compare panels Datasheet PDF
Power (Wp)
390
Weak · bottom 20%
Efficiency (%)
20.10
Weak · bottom 22%
Density (Wp/m²)
200.2
Weak · bottom 21%
Temp (%/°C)
-0.340
Typical · median -0.300
Weight (kg)
21.0
Typical · median 22.3 kg
Warranty (yrs)
25
Weak · bottom 19%

The NeMo 4.2 80M series from Heckert Solar is a German-engineered solution for rooftop installations where both performance and aesthetics matter. The modules are built on monocrystalline M12 cells in a half-cut configuration, which reduces power losses under partial shading and minimizes the risk of hot-spot formation - a feature especially valuable on roofs with chimneys, dormers, or nearby obstructions. The multi-busbar technology used here improves current collection across the cell surface and boosts the long-term reliability of electrical connections. What sets these panels apart is that they are manufactured in Germany, which for many investors translates into consistent quality, full compliance with strict EU standards, and a shorter supply chain compared to Asian-made modules. A sturdy, silver anodized aluminum frame provides mechanical resistance against snow and wind loads, while the uniform, clean cell surface gives a pleasing appearance on residential roofs. The NeMo 4.2 80M series works well both for home on-grid installations and commercial projects, where a long-term manufacturer warranty and stable output under challenging irradiance conditions are priorities. It's a solid choice for investors who value European quality and predictability.

Ranking

6,208 panels in the 290-490 W band, all technologies
Metric This panel Median Position in segment Overall rank
Module efficiency 20.10% 21.26% Weak · bottom 22% 12,102
Power density 200.2 212.5 Weak · bottom 21% 12,179
Temperature coefficient -0.340 -0.300 Typical 8,778
Weight per kWp 53.8 53.3 Typical 7,897
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

4 positive · 5 caution
Best for

Residential and commercial.

Not ideal for

Owners who want a long output guarantee, roofs where every square metre has to count and tight roof space.

Watch-outs
25 year performance warranty

Bottom 19% of the 290-490 W band, against a median of 30 yrs.

200.2 watts per square metre

Bottom 21% of the 290-490 W band, against a median of 212.5.

20.10% module efficiency

Bottom 22% of the 290-490 W band, against a median of 21.26%.

What owners get
Made in Germany, TÜV Rheinland certified

Modules are manufactured exclusively at Heckert Solar's Chemnitz/Langenwetzendorf facility and carry TÜV Rheinland certification per IEC 61215, IEC 61730, and IEC 61701. This means a shorter supply chain and full EU regulatory compliance compared to Asian peers (EGing PV, Goldi Solar, VSUN).

Half-cut G12 cells with 12 busbars

The use of 80 monocrystalline G12 half-cells combined with 12 busbars reduces power loss under partial shading and hot-spot risk, while improving current collection across the cell surface.

Solid 15/25-year warranty

The manufacturer offers a 15-year product warranty and a 25-year power warranty (90% at 10 years, 80% at 25 years), a solid, predictable standard for a European tier-1 manufacturer.

Over 30 years of manufacturing experience

Heckert Solar has operated since 1992, with production capacity at its Saxony plant reaching 800 MWp per year, translating into a mature quality process and reliable supply for both residential and commercial installations.

Trade-offs
No bifacial variant available

Two of the three comparable 405 Wp modules - Goldi Solar GS10-M108-BF and VSUN405-108BMH-DG - offer bifacial technology, while the NeMo 4.2 80M is monofacial only. This limits potential extra energy yield from albedo gain in ground-mount or bright-roof installations.

Lower-bound efficiency trails peer comparables

The lowest-power variant (390 Wp) reaches 20.1% efficiency, below comparable 405 Wp modules from competitors: EGing PV STAR SERIES (20.74%), VSUN405-108BMH-DG (20.74%), and Goldi Solar GS10-M108-BF (20.66%). This means the entry-tier variants require slightly more roof area for the same power output.

Notes from the database
  • At 20.1% efficiency, this panel is 1.7pp below the database median of 21.8%
  • 200.2 W/m² power density is 17.9 W/m² below database median (218.1 W/m²) - requires larger installation area
  • At -0.34%/°C, loses 0.04pp more power per degree than database median (-0.30%/°C)
  • At 21.0 kg, this panel is 5.5 kg lighter than database median (26.5 kg) - easier handling during installation
  • #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 % Weak Segment median 21.26%
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 22.3 kg
Cells 80 Monocrystalline
Coefficient Pmax -0.340 %/°C Typical median -0.300 of its segment
Coefficient Voc · Isc -0.263 · 0.037 %/°C
Product warranty 15 years Hardware defects only
Performance warranty 25 years Weak bottom 19% · median 30 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 -0.300
-
Filter these
Size
Panel Power Eff. Temp. Weight Difference
Heckert Solar NeMo 4.2 80M 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 is the maximum power output of the Heckert Solar NeMo 4.2 80M panel?
Panels from the NeMo 4.2 80M series reach a maximum power output of up to 405 Wp. This is achieved through monocrystalline M12 half-cut cells, which use the available module surface more efficiently and reduce power losses, meaning fewer panels are needed to reach a target system size.
What warranty does Heckert Solar offer on the NeMo 4.2 80M series?
The manufacturer provides a 15-year product warranty and a 25-year power output warranty. This means that after 25 years of operation, the panel is still expected to deliver a significant share of its nominal power. This level of coverage is typical for European manufacturers focused on quality and long-term reliability.
Are the NeMo 4.2 80M panels suitable for roofs with chimneys or dormers causing partial shading?
Yes, thanks to half-cut cell technology, each cell is split in two, which limits the power drop of the whole panel when part of its surface is shaded and reduces the risk of hot-spot formation. This is particularly useful on roofs with chimneys, dormers, or nearby buildings casting shadows on part of the array.
How does German manufacturing at Heckert Solar differ from panels made in Asia?
NeMo 4.2 80M panels are manufactured in Germany, ensuring full compliance with strict EU standards, consistent production quality, and a shorter supply chain compared to modules imported from Asia. For many investors, this also means an easier warranty claims process through the manufacturer's European service network.
Is the NeMo 4.2 80M panel bifacial and does it generate power from both sides?
No, the NeMo 4.2 80M series is a monofacial panel that generates power only from its front side. This is a standard, proven solution for typical roof-mounted installations, where modules sit close to the roof surface and cannot capture reflected light from behind.
What do the multiple busbars in the NeMo 4.2 80M panels mean for installation durability?
The multi-busbar technology improves current collection from the cell surface and increases the number of conductive paths, reducing the risk of circuit interruption from cell microcracks. In practice, this results in more reliable electrical connections and more stable power output throughout the panel's lifetime.
Add to compare