--- title: "Einnova Solarline ESM-400 Terra Cotta 400W Solar Panel - Specs & Review | ComparePV" description: "Einnova Solarline ESM-400 Terra Cotta 400W solar panel. Specs: 20.00% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/einnova-solarline-esm-400-terra-cotta" updated: 2026-09-11 --- # Einnova Solarline ESM-400 Terra Cotta Middle of its segment, modest efficiency 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Einnova Solarline - **Model:** ESM-400 Terra Cotta - **Series:** ESM Terra Cotta - **Rated power:** 400 W - **Cell technology:** TOPCon ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 1% | | | Module efficiency | 20.00% | 22.00% | Weak - bottom 1% | 12,214 | | Power density | 204.8 | 220.2 | Weak - bottom 2% | 11,370 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 10% | 8,005 | | Weight (kg) | 21.0 kg | 22.0 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.00% | 22.00% | Weak - bottom 1% | 12,214 | | Power density | 204.8 | 220.2 | Weak - bottom 2% | 11,370 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 10% | 8,005 | | Weight per kWp | 52.5 | 51.4 | Typical | 6,043 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **20.00% module efficiency** - Bottom 1% of the TOPCon 400-450 W segment, against a median of 22.00%. Ranked 12,214th in the whole database. - **204.8 watts per square metre** - Bottom 2% of the TOPCon 400-450 W segment, against a median of 220.2. Ranked 11,370th in the whole database. - **-0.310 %/°C temperature coefficient** - Bottom 10% of the TOPCon 400-450 W segment, against a median of -0.290. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.00 % - **Voltage at Pmax (Vmp):** 33.25 V - **Current at Pmax (Imp):** 12.03 A - **Open-circuit voltage (Voc):** 39.10 V - **Short-circuit current (Isc):** 12.66 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.310 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 108 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 21.0 kg - **Area:** 1.95 m2 - **Power density:** 204.8 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 83.0 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.50 % - **Output after 30 years:** 332 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 12214 of 14005 | | Power density | 11370 of 14005 | | Temperature coefficient | 8005 of 14005 | | Weight | 6043 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Only Viable Option for Heritage Conservation Zones** - The terra cotta color achieved through tinted tempered glass enables building permits and heritage authority approvals in locations where standard black modules are rejected outright. For property owners in landscape protection zones or historic city centers, this is often the only pathway to a legally compliant PV installation. - **N-type TOPCon Cell Technology** - N-type TOPCon cells exhibit lower LID degradation rates and superior performance under high-temperature conditions (typical power temperature coefficient of approx. -0.30%/°C) compared to legacy PERC technology (-0.35%/°C), translating into measurably higher annual energy yield on south-facing rooftops. - **30-Year Product and Power Output Warranty** - The manufacturer provides both a 30-year product warranty and a 30-year power output warranty — an exceptional combination in the aesthetic BIPV module segment, where industry standard typically stands at 10–12 years for product warranty and 25 years for power output warranty. - **20% Efficiency Substantially Outperforms DMEGC (15.48%)** - Compared directly to the DMEGC GH400M10T-B48HST (15.48%), the 20% module efficiency delivers approximately 29% higher power density over the same roof area — a critical advantage when available roof space on a heritage building is constrained. - **Anti-Reflective Surface Treatment** - A specialized glass surface texture minimizes specular reflections, eliminating glare nuisance for neighboring properties and improving diffuse irradiance absorption — particularly relevant on rooftops with a suboptimal tilt angle or partial shading. ## Cons - **Efficiency Penalty vs. Standard TOPCon Modules** - The terra cotta tinted glass introduces a typical relative efficiency loss of ~5–10% compared to standard black TOPCon modules (which achieve 22–23%), as directly illustrated by comparisons with Meyer Burger White at 21.7% and Solaria PowerXT at 20.2%. For a 5 kWp system, the ~1.7 percentage-point gap versus Meyer Burger White translates to approximately 85–100 kWh less annual generation under Polish irradiance conditions. - **Single Wattage Option (400 Wp)** - The series is offered in a single 400 Wp variant only, limiting system design flexibility — it is not possible to select higher-wattage modules to suit specific roof layout configurations or inverter MPPT input requirements, unlike standard TOPCon series available across the 400–700 Wp range. - **No Confirmed BNEF Tier 1 Status** - Einnova Solarline does not appear on publicly available BNEF Tier 1 quarterly lists for 2025 (Q1–Q4), which may present a constraint for bank financing of commercial installations, where financial institutions routinely require modules sourced from Tier 1-listed manufacturers. ## About this series ESM Terra Cotta is an advanced photovoltaic solution created for projects where aesthetics play a key role and standard, dark modules disrupt the architectural harmony of the surroundings. These panels use **specially colored tempered glass** with a deep, brick-red shade that perfectly imitates the colors of traditional ceramic roof tiles. Thanks to this, the installation becomes almost invisible, effectively solving the problem of conservation restrictions in historic city centers and landscape-protected areas. The use of efficient **monocrystalline cells in PERC technology** allows for maintaining satisfactory energy efficiency despite the presence of a color filter. The modules stand out with a unique **structure that minimizes light reflections**, eliminating the annoying mirror effect and significantly improving the absorption of diffuse solar radiation. This product is dedicated primarily to owners of houses with a classic shape and investors carrying out renovations of historical buildings. ESM Terra Cotta guarantees **full visual integration with the roof surface**, which clearly distinguishes this series from the competition focused solely on standard black. By choosing this model, you can be sure that modern technology will not negatively impact the traditional character of the building, combining ecological electricity production with the highest standard of design. ## Notable figures - Module efficiency of 20.0% is 2.0pp below average for \*\*TOPCon 400-450W\*\* panels (median: 22.0%) - Power density of 204.8 W/m² is 15.4 W/m² below \*\*TOPCon 400-450W\*\* median (220.2 W/m²) - needs more roof space - Temperature coefficient of -0.31%/°C is 0.02pp worse than \*\*TOPCon 400-450W\*\* median (-0.29%/°C) - higher losses in summer heat - Weight of 21.0 kg is typical for \*\*TOPCon 400-450W\*\* panels - #12214 for efficiency, #8005 for temperature performance out of 14005 panels ## Questions ### Will the ESM Terra Cotta panels pass heritage authority review and can they be installed on a listed building? The ESM Terra Cotta series is designed precisely with such applications in mind. The tempered glass, finished in a deep brick-red hue, closely mimics the color palette of traditional ceramic roof tiles, ensuring that the installation does not alter the character of a historic façade or the overall massing of the building. This is a compelling argument when seeking approval from the Regional Heritage Preservation Officer (Wojewódzki Konserwator Zabytków); however, the final decision always depends on the individual assessment of the officer and the specific property in question. ### How does TOPCon technology affect the efficiency of the ESM Terra Cotta panels given that they use tinted rather than transparent glass? TOPCon cells achieve higher laboratory efficiency than older PERC technology, which partially offsets the optical losses introduced by the tinted glass filter. Through the use of an ultra-thin silicon oxide and polysilicon passivation layer on the rear side of the cell, a greater proportion of electrons is converted into usable current. In practice, ESM Terra Cotta modules rated at 400 Wp deliver energy yields that are fully satisfactory for prosumer installations, despite the deliberate departure from clear glass. ### What warranty does the Einnova Solarline ESM Terra Cotta panel carry, and what exactly does it cover? The manufacturer provides a 30-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. This means that over three decades the panel is warranted to maintain the declared energy yield in accordance with the degradation curve specified in the product datasheet. This is one of the longest warranty periods currently available on the market and significantly reduces the financial risk associated with the investment. ### Is the ESM Terra Cotta module bifacial, and is the absence of this feature a drawback in a typical rooftop installation? The ESM Terra Cotta series is not bifacial and therefore does not harvest irradiance reflected onto the rear surface. In a typical pitched-roof installation this is not a limitation, since the rear side of the panel is in any case adjacent to the mounting structure. The absence of bifaciality is a deliberate engineering compromise for a panel with a specialized aesthetic purpose; the entire available front surface area is utilized by the tinted absorber layer. ### For what system size is the 400 Wp ESM Terra Cotta panel suited, and how many modules does a typical household require? At 400 Wp, a single ESM Terra Cotta module falls squarely within the typical power range for prosumer installations. For a household with an annual consumption of 4,000–5,000 kWh, 10 to 14 modules are generally sufficient, depending on the solar irradiance of the region and the orientation of the roof. The series is intended primarily for pitched roofs with a traditional architectural profile, where visual integration is considered equally important as energy yield. ### Does the fact that Einnova Solarline ESM Terra Cotta panels are manufactured in China affect product quality or the availability of after-sales service in Poland? Einnova Solarline, like the vast majority of PV module manufacturers, is headquartered in China — a standard industry practice. What matters most to the buyer is the warranty terms enforced by the local distributor or importer in Poland, as well as the certifications held by the manufacturer (IEC 61215, IEC 61730). Before purchasing, it is advisable to confirm with the supplier which entity in Poland is responsible for handling warranty claims throughout the full 30-year warranty period. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/terra-cotta-m400w-ef0cdaf1b11e.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 | +40 W, cooler, +3.1 pp | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, cooler, +3.1 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, heavier, +3.0 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, heavier, +3.0 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, heavier, +3.0 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, heavier, +3.0 pp | | [Einnova Solarline ESM-435T](https://comparepv.com/panel/einnova-solarline-esm-435t) | 435 W | +35 W, +2.3 pp | | [Einnova Solarline ESM-440T](https://comparepv.com/panel/einnova-solarline-esm-440t) | 440 W | +40 W, +2.5 pp | | [Einnova Solarline ESM-445T](https://comparepv.com/panel/einnova-solarline-esm-445t) | 445 W | +45 W, +2.8 pp | | [Einnova Solarline ESM-450T](https://comparepv.com/panel/einnova-solarline-esm-450t) | 450 W | +50 W, +3.0 pp | | [Einnova Solarline ESM-455T](https://comparepv.com/panel/einnova-solarline-esm-455t) | 455 W | +55 W, +3.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +110 W, cooler, +5.0 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +95 W, cooler, +4.8 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +105 W, cooler, +4.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +90 W, cooler, +4.5 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +100 W, cooler, +4.5 pp | --- Source: https://comparepv.com/panel/einnova-solarline-esm-400-terra-cotta Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.