--- title: "ET Solar ET-M772BH535WW/WB 535W Solar Panel - Specs & Review | ComparePV" description: "ET Solar ET-M772BH535WW/WB 535W solar panel. Specs: 20.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/et-solar-et-m772bh535ww-wb" updated: 2026-09-11 --- # ET Solar ET-M772BH535WW/WB Strong in heat, short guarantee 706 panels in the segment PERC 500-550 W ## Identity - **Manufacturer:** ET Solar - **Model:** ET-M772BH535WW/WB - **Series:** Elite PLUS - **Rated power:** 535 W - **Cell technology:** PERC ## How it compares Compared against segment PERC 500-550 W (706 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 535 W | 535 W | Typical | | | Module efficiency | 20.70% | 20.90% | Typical | 10,764 | | Power density | 207.0 | 209.0 | Weak - bottom 25% | 10,849 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 23% | 8,778 | | Weight (kg) | 28.0 kg | 28.4 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 23% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.70% | 20.90% | Typical | 10,764 | | Power density | 207.0 | 209.0 | Weak - bottom 25% | 10,849 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 23% | 8,778 | | Weight per kWp | 52.3 | 53.0 | Typical | 5,807 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 23% | 9,798 | ### Strengths - **-0.340 %/°C temperature coefficient** - Top 23% of the PERC 500-550 W segment, against a median of -0.350. ### Watch out for - **25 year performance warranty** - Bottom 23% of the PERC 500-550 W segment, against a median of 30 yrs. - **207.0 watts per square metre** - Bottom 25% of the PERC 500-550 W segment, against a median of 209.0. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Owners who want a long output guarantee and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 535 W - **Efficiency:** 20.70 % - **Voltage at Pmax (Vmp):** 41.47 V - **Current at Pmax (Imp):** 12.90 A - **Open-circuit voltage (Voc):** 49.45 V - **Short-circuit current (Isc):** 13.79 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.263 %/degC - **Temperature coefficient of Isc:** 0.054 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 ### Physical - **Length:** 2279 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 28.0 kg - **Area:** 2.58 m2 - **Power density:** 207.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 84.8 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.55 % - **Output after 30 years:** 439 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10764 of 14005 | | Power density | 10849 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 5807 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **21.4% Efficiency Among the Top-Performing PERC Modules** - A peak efficiency of 21.4% places this series directly alongside the best comparable models on the market: JA Solar DEEP BLUE 3.0 reaches 21.5%, DAH DHM-72X10 achieves 21.48%, and Boviet VEGA comes in at 21.3%. The gap to the segment leader is just 0.1 percentage points — a difference that is negligible in any real-world installation. - **Power Range of 535–555 Wp Across 5 Variants** - Five power variants (in ~5 Wp increments) provide design flexibility for systems with varying roof areas and inverter configurations, minimizing mismatch losses within a string. - **Mechanical Durability Certified by TÜV SÜD** - The datasheet confirms a snow load rating of 5,400 Pa and a wind load rating of 2,400 Pa. TÜV SÜD certification for salt mist and ammonia resistance (Class C4/C3) makes this series well suited for demanding environments, including coastal sites, agricultural facilities, and industrial installations. - **25-Year Linear Power Warranty** - A standard 25-year performance warranty is in line with the market norm for this power class (535–555 Wp); comparable products such as the JA Solar DEEP BLUE 3.0 and Boviet VEGA offer the same warranty horizon. ## Cons - **Series Discontinued (2023)** - Production was discontinued in 2023 after only three years on the market (launched in 2020). This means limited availability of additional modules for system expansion, no dedicated technical support for this series, and potential difficulties obtaining a warranty replacement unit. - **Manufacturer Not Listed on BNEF Tier-1** - ET Solar does not appear on the BNEF Tier-1 Bankable Manufacturers lists (2022–2023), unlike JA Solar, the leader among peer comparables. The absence of Tier-1 status disqualifies or complicates project financing that requires bankable module coverage, and may increase insurance costs for commercial installations. - **12-Year Product Warranty — Below Premium Standard** - ET Solar offers a 12-year product warranty, whereas JA Solar's DEEP BLUE 3.0 series carries a standard 15-year warranty. The three-year difference is material for commercial projects with longer financing horizons, such as 10–12-year lease structures. - **Documented Warranty Service Issues** - Industry forums (DIY Solar Power Forum, EnergySage) and SolarReviews have reported instances of ET Solar's service being unreachable — including an inactive email address and a disconnected U.S. phone number (complaints filed as of May 2022). The company also underwent bankruptcy proceedings and a 20-month operational hiatus before being reactivated, posing an additional risk to the continuity of warranty claim processing. - **PERC Technology Without an Upgrade Path to N-Type** - This series is based on mono-Si PERC cells, while the market largely transitioned to N-type TOPCon during 2022–2023. TOPCon offers a lower LID degradation rate (~0.3%/year vs. ~0.5%/year for PERC) and a better temperature coefficient of power. Next-generation peer comparables — such as the JA Solar Deep Blue 4.0 Pro — already offer N-type technology at a comparable price point. ## About this series The ET Solar Elite PLUS series is an advanced solution for investors seeking maximum efficiency from limited roof or ground space. These panels utilize **N-type TOPCon cell technology**, which effectively eliminates the problem of light- and voltage-induced degradation, guaranteeing stable energy yields for decades. Thanks to the use of bifacial design in selected variants, these modules can generate additional current from radiation reflected off the ground, which significantly increases the profitability of installations on bright flat roofs or ground structures. What sets this series apart from the competition is, above all, an **excellent temperature coefficient**, allowing for the maintenance of high efficiency even during extreme heat, when standard panels lose power. This solution is dedicated to demanding prosumers and photovoltaic farm owners who care about **maximizing self-consumption** and a fast return on investment. Certification for high-voltage operation at 1500V reduces system costs, and tempered glass with a unique texture improves performance in low sunlight conditions. A robust frame and high junction box sealing ensure **above-average resistance to harsh weather conditions**, such as hail, ammonia, or strong wind gusts. Elite PLUS is a synonym for reliability in the variable Polish climate, combining technical innovations with the longevity of all system components. ## Notable figures - At 20.7% efficiency, this panel is on par with typical \*\*PERC 500-550W\*\* modules - At 207.0 W/m² power density, roof space requirements are typical for \*\*PERC 500-550W\*\* panels - At -0.34%/°C, hot weather performance is typical for \*\*PERC 500-550W\*\* panels - #10764 for efficiency, #8778 for temperature performance out of 14005 panels ## Questions ### Is the ET Solar Elite PLUS series still available for purchase? The ET Solar Elite PLUS series has been discontinued and is no longer available through regular sales channels. If you are looking for panels from this manufacturer featuring PERC technology in the 550 Wp range, it is worth contacting a distributor to check for remaining stock, or considering newer ET Solar series that have replaced this product line. ### What warranty does ET Solar offer on the Elite PLUS panels? ET Solar provides a 12-year product warranty (materials and workmanship) and a 25-year linear power output warranty for the Elite PLUS series. This means the manufacturer guarantees a defined minimum energy yield over a quarter century. This is the standard warranty level for the PERC module segment, although it should be noted that ET Solar is not classified as a Tier 1 manufacturer. ### What cell technology does the ET Solar Elite PLUS use, and what does it mean in practice? The Elite PLUS series uses PERC (Passivated Emitter and Rear Cell) cells in a half-cut configuration, which reduces resistive losses and improves tolerance to partial shading. Compared to older standard monocrystalline cells without PERC, these modules achieve higher efficiency at a similar footprint. Peak power reaches 555 Wp, making them a strong choice where maximizing yield per square meter is a priority. ### Are the ET Solar Elite PLUS 555W panels suitable for a pitched roof installation in the Polish climate? Yes, Elite PLUS series modules are certified for wind loads of up to 2400 Pa and snow loads of up to 5400 Pa, which covers the conditions typically encountered in Poland. The tempered glass with anti-reflective texture improves yield under the diffuse irradiance characteristic of Central European latitudes. The aluminum frame and sealed junction box ensure moisture and frost resistance. ### Is the ET Solar Elite PLUS a bifacial panel or monofacial only? The Elite PLUS 555 Wp model in its base configuration is a monofacial module — it generates electricity solely from irradiance incident on the front cell surface. The Elite PLUS series also included bifacial variants, but these correspond to separate models identified by the word 'bifacial' in the commercial designation and cover a slightly different power range. ### Is ET Solar a Tier 1 manufacturer, and does it matter when purchasing Elite PLUS panels? ET Solar does not appear on the Tier 1 manufacturer lists published by rating agencies such as BloombergNEF. In practice, this means that certain banks and insurers may require additional collateral or guarantees when financing installations based on these modules. For a typical residential prosumer installation the difference is less significant; however, it should be factored into any long-term risk assessment, particularly given that the Elite PLUS series has already been discontinued. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/panel-solar-et-solar-elite-plus-535-555w-b664a332c0f6.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, +4.3 pp, +5 yr warranty | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +4.1 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, +4.1 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, +4.0 pp, +5 yr warranty | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, +3.9 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +3.8 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, +3.8 pp, +5 yr warranty | | [ET Solar ET-M772BH530TW/TB](https://comparepv.com/panel/et-solar-et-m772bh530tw-tb) | 530 W | +5 yr warranty | | [ET Solar ET-M772BH540TW/TB](https://comparepv.com/panel/et-solar-et-m772bh540tw-tb) | 540 W | +5 yr warranty | | [ET Solar ET-M772BH545TW/TB](https://comparepv.com/panel/et-solar-et-m772bh545tw-tb) | 545 W | +10 W, +0.4 pp, +5 yr warranty | | [ET Solar ET-M772BH550TW/TB](https://comparepv.com/panel/et-solar-et-m772bh550tw-tb) | 550 W | +15 W, +0.6 pp, +5 yr warranty | | [ET Solar ET-M772BH555WW/WB](https://comparepv.com/panel/et-solar-et-m772bh555ww-wb) | 555 W | +20 W, +0.7 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +115 W, cooler, +4.5 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +110 W, cooler, +4.3 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +105 W, cooler, +4.1 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +100 W, cooler, +3.9 pp | --- Source: https://comparepv.com/panel/et-solar-et-m772bh535ww-wb Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.