--- title: "Heckert Solar ZEUS 1.1 440WP Full Black 440W Solar Panel - Specs & Review | ComparePV" description: "Heckert Solar ZEUS 1.1 440WP Full Black 440W solar panel. Specs: 22.00% efficiency, Monocrystalline cells." source: "https://comparepv.com/panel/heckert-solar-zeus-1-1-440wp-full-black" updated: 2026-09-11 --- # Heckert Solar ZEUS 1.1 440WP Full Black Strong in heat, no clear weak spot 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Heckert Solar - **Model:** ZEUS 1.1 440WP Full Black - **Series:** ZEUS 1.1 - **Rated power:** 440 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 440 W | 435 W | Typical | | | Module efficiency | 22.00% | 22.00% | Typical | 6,517 | | Power density | 220.2 | 220.2 | Typical | 6,328 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 4% | 1,309 | | Weight (kg) | 20.9 kg | 22.0 kg | Strong - top 15% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.00% | 22.00% | Typical | 6,517 | | Power density | 220.2 | 220.2 | Typical | 6,328 | | Temperature coefficient | -0.280 | -0.290 | Strong - top 4% | 1,309 | | Weight per kWp | 47.5 | 51.4 | Strong - top 15% | 1,726 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **-0.280 %/°C temperature coefficient** - Top 4% of the TOPCon 400-450 W segment, against a median of -0.290. Ranked 1,309th in the whole database. - **47.5 kg per kWp** - Top 15% of the TOPCon 400-450 W segment, against a median of 51.4. - **Best for:** Residential, commercial, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 440 W - **Efficiency:** 22.00 % - **Voltage at Pmax (Vmp):** 29.72 V - **Current at Pmax (Imp):** 14.81 A - **Open-circuit voltage (Voc):** 34.67 V - **Short-circuit current (Isc):** 15.95 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.280 %/degC - **Temperature coefficient of Voc:** -0.240 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 96 - **Bifacial:** yes ### Physical - **Length:** 1762 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 20.9 kg - **Area:** 2.00 m2 - **Power density:** 220.2 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.45 % - **Output after 30 years:** 374 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6517 of 14005 | | Power density | 6328 of 14005 | | Temperature coefficient | 1309 of 14005 | | Weight | 1726 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type TOPCon with low Tcoef** - The power temperature coefficient of -0.28%/°C places ZEUS 1.1 among the top performers in the 440–445 Wp residential/C&I segment. For rooftop installations where module temperatures regularly reach 65–75°C in summer, this is a meaningful advantage over legacy PERC cells (-0.34%/°C), translating into measurably higher annual yield without additional BoS cost. - **Glass-glass: 8,100 Pa snow load** - The dual-glass construction with 2+2 mm tempered glass withstands snow loads up to 8,100 Pa and wind pressure up to 2,400 Pa (IEC 61215 tested). This is a significant structural advantage over backsheet-based modules in Central European climates, where freeze-thaw cycles increase the risk of micro-cracks and long-term delamination. - **30-year power warranty vs. peers at 25** - Heckert guarantees ≥91.70% of rated power at year 15 and ≥84.95% at year 30. The comparable Q-Cells Q.TRON BLACK covers power output only to 25 years (≥90.58%), making ZEUS 1.1 the stronger choice when LCOE is modeled over a 30+ year asset lifetime. - **Made in Germany — full supply-chain traceability** - Modules are manufactured at facilities in Chemnitz and Langenwetzendorf (Saxony/Thuringia). This ensures full material traceability compliant with EU CBAM and the ESG due-diligence requirements increasingly imposed by project financiers and insurers on utility and C&I PV assets in the EU. - **Environmental certifications: PID / ammonia / salt mist** - The datasheet confirms certified resistance to PID, ammonia (IEC 62716), salt mist (IEC 61701), and sand/dust. This allows ZEUS 1.1 to be deployed without additional protective measures in livestock farms, coastal sites, and industrial environments — locations that disqualify many lower-cost modules outright. ## Cons - **Not on BNEF Tier-1 list** - Heckert Solar does not appear on the Bloomberg NEF Tier-1 Module Manufacturers list (H1 2026), which may be a limiting factor for projects requiring bank financing or insurance from institutions that use Tier-1 status as an eligibility criterion. Q-Cells Q.TRON BLACK offers comparable 22.3% efficiency with full BNEF Tier-1 standing. - **2024 workforce restructuring** - The company cut approximately 95 positions in 2024. While Heckert continues active production and is part of a consortium targeting a €2 billion investment in domestic PV manufacturing, the headcount reduction reflects cost pressure worth monitoring against the backdrop of a 30-year warranty commitment. ## About this series The Heckert Solar ZEUS 1.1 series is designed for maximum durability and stable performance in real-world conditions. These are **glass-glass** modules, which are better able to withstand long-term environmental stress than traditional constructions with a backsheet - resulting in a lower risk of microcracks and a longer lifespan for the installation. The use of **n-type TOPCon** cells supports high efficiency and good performance in hot weather, when many panels noticeably lose performance. Thanks to the **half-cut** architecture, the modules also perform better under partial shading, reducing losses and improving the performance of the entire string. The ZEUS 1.1 also stands out for its resistance to typical operational problems, such as PID (potential-induced degradation) and aggressive environments (e.g., around farms and coastal areas), and the **30-year warranty** makes it easier to ensure the security of the investment. It is a good choice for residential and commercial installations, where predictable performance, aesthetics, and long-term reliability are important. ## Notable figures - At 22.0% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - At 220.2 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - Temperature coefficient of -0.28%/°C matches the \*\*TOPCon 400-450W\*\* median - Weight of 20.9 kg (1.1 kg below \*\*TOPCon 400-450W\*\* median of 22.0 kg) allows easier transport and roof mounting - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### What warranty does the Heckert Solar ZEUS 1.1 come with? The ZEUS 1.1 series comes with a 30-year product warranty and a 30-year power output warranty. This means the manufacturer covers manufacturing defects and guarantees a defined performance level for three decades. It is one of the longest warranty packages available on the market, making it especially relevant for residential and commercial installations where a predictable long-term return on investment is a priority. ### Is the Heckert Solar ZEUS 1.1 a bifacial panel and what does that mean in practice? Yes, the ZEUS 1.1 is a bifacial module, meaning it generates electricity from both the front and rear sides of the cell. Depending on the surface beneath the array (light gravel, white membrane, pale concrete), the rear side can contribute up to 25% additional energy yield. The greatest gains are achieved in ground-mount systems and flat-roof installations with a reflective surface that allows diffuse and reflected light to reach the back of the module. ### How does the Heckert Solar ZEUS 1.1 perform in high temperatures during summer? The n-type TOPCon cell technology delivers a favorable temperature coefficient of -0.28%/°C for Pmax. By comparison, conventional p-type PERC cells typically lose -0.35%/°C or more. In practical terms, on hot summer days the ZEUS 1.1 loses less power than many competing modules, which directly translates into higher annual energy yields. ### How heavy is the ZEUS 1.1 panel and can it be installed on a pitched roof without issues? The Heckert Solar ZEUS 1.1 weighs 20.9 kg with dimensions of 1762 x 1134 x 30 mm. This is a standard weight for a glass-glass module in this power class and falls within the load limits of typical residential roof structures. Installation on a pitched roof is feasible without special reinforcements at standard rafter spacings, although a structural assessment of the roof is always recommended before installation. ### What mechanical load ratings does the Heckert Solar ZEUS 1.1 have — is it suitable for snowy or windy regions? The ZEUS 1.1 has been tested up to 8,100 Pa for snow load and 2,400 Pa for wind load. The glass-glass construction, in which two layers of 2 mm tempered glass replace a conventional backsheet, further increases resistance to long-term mechanical stress and reduces the risk of microcracks in the cells. The module is well-suited for mountain regions or coastal areas exposed to heavy snow and strong winds. ### Are Heckert Solar ZEUS 1.1 modules resistant to PID and harsh environments such as farms or coastal locations? Yes. The ZEUS 1.1 series carries certified PID (Potential Induced Degradation) resistance, which is particularly important in large high-voltage strings. The manufacturer also confirms resistance to ammonia, salt mist, sand, and dust, making this module a suitable choice near agricultural facilities and in coastal zones where salt exposure accelerates corrosion of less durable components. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Data-sheet-Zeus-11-Full-Black-EN-web-156dd4bd1727.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +50 W, cooler, +2.5 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | +50 W, cooler, +2.5 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | +45 W, cooler, +2.3 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | +45 W, cooler, +2.3 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | +45 W, cooler, +2.3 pp | | [Gokin GK-5-54HG-485M](https://comparepv.com/panel/gokin-gk-5-54hg-485m) | 485 W | +45 W, cooler, +2.3 pp | | [Heckert Solar ZEUS 3.0+ 108 485WP](https://comparepv.com/panel/heckert-solar-zeus-3-0-108-485wp) | 485 W | +45 W, heavier, +2.3 pp | | [Heckert Solar ZEUS 1.1 445W Black Frame](https://comparepv.com/panel/heckert-solar-zeus-1-1-445w-black-frame) | 445 W | +0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +70 W, cooler, +3.0 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +55 W, cooler, +2.8 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +65 W, cooler, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +60 W, cooler, +2.5 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +60 W, cooler, +2.5 pp | --- Source: https://comparepv.com/panel/heckert-solar-zeus-1-1-440wp-full-black Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.