--- title: "Heckert Solar NeMo® 4.2 80 M BLACK 390 390W Solar Panel - Specs & Review | ComparePV" description: "Heckert Solar NeMo® 4.2 80 M BLACK 390 390W solar panel. Specs: 20.10% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/heckert-solar-nemo-4-2-80-m-black-390" updated: 2026-09-11 --- # Heckert Solar NeMo® 4.2 80 M BLACK 390 Strong in heat, no clear weak spot 579 panels in the segment PERC 350-400 W ## Identity - **Manufacturer:** Heckert Solar - **Model:** NeMo® 4.2 80 M BLACK 390 - **Series:** NeMo® 4.2 80 M BLACK - **Rated power:** 390 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 350-400 W (579 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 390 W | 380 W | Typical | | | 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 (kg) | 21.0 kg | 21.4 kg | Typical | | | Performance warranty | 25 yrs | 25 yrs | Typical | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### Strengths - **-0.340 %/°C temperature coefficient** - Top 15% of the PERC 350-400 W segment, against a median of -0.350. - **Best for:** Residential, commercial and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 390 W - **Efficiency:** 20.10 % - **Voltage at Pmax (Vmp):** 46.25 V - **Current at Pmax (Imp):** 8.48 A - **Open-circuit voltage (Voc):** 54.33 V - **Short-circuit current (Isc):** 8.96 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.262 %/degC - **Temperature coefficient of Isc:** 0.037 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 80 ### Physical - **Length:** 1736 mm - **Width:** 1122 mm - **Thickness:** 35 mm - **Weight:** 21.0 kg - **Area:** 1.95 m2 - **Power density:** 200.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 80.0 % - **Output after 30 years:** 297 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12102 of 14005 | | Power density | 12179 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 7897 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **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. ## Cons - **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. ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/db-nemo-4-2-80-m-black-390-405-9f5bde897c72.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | +50 W, cooler, +3.0 pp | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -50 W, +2.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +2.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +2.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | Lighter, +2.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | Lighter, +2.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +2.9 pp, +5 yr warranty | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +50 W, cooler, +2.8 pp | | [Heckert Solar NEMO® 4.1 80 M 385](https://comparepv.com/panel/heckert-solar-nemo-4-1-80-m-385) | 385 W | -0.3 pp | | [Heckert Solar NeMo® 4.2 80 M 390](https://comparepv.com/panel/heckert-solar-nemo-4-2-80-m-390) | 392 W | Very close match | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +120 W, cooler, +4.9 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +105 W, cooler, +4.7 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +115 W, cooler, +4.6 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +100 W, cooler, +4.4 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +110 W, cooler, +4.4 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +110 W, cooler, +4.4 pp | --- Source: https://comparepv.com/panel/heckert-solar-nemo-4-2-80-m-black-390 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.