--- title: "Heckert Solar NeMo 4.2 80M 390 390W Solar Panel - Specs & Review | ComparePV" description: "Heckert Solar NeMo 4.2 80M 390 390W solar panel. Specs: 20.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/heckert-solar-nemo-4-2-80m-390" updated: 2026-09-11 --- # Heckert Solar NeMo 4.2 80M 390 Middle of its segment, short guarantee 6,208 panels in the 290-490 W band, all technologies ## Identity - **Manufacturer:** Heckert Solar - **Model:** NeMo 4.2 80M 390 - **Series:** NeMo 4.2 80M - **Rated power:** 390 W - **Cell technology:** Monocrystalline ## How it compares Compared against 290-490 W band, all technologies (6208 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 390 W | 430 W | Weak - bottom 20% | | | 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 (kg) | 21.0 kg | 22.3 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | 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 | ### Watch out for - **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%. - **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. ## 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:** -0.263 %/degC - **Temperature coefficient of Isc:** 0.037 %/degC ### Cell and construction - **Cell type:** Monocrystalline - **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 - **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. ## Cons - **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. ## About this series 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. ## Notable figures - 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 ## Questions ### 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. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DB-NeMo-42-80-M_390-405_web-5a668afd3d3a.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-4-2-80m-390 Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.