--- title: "ET Solar ET-M772BH545TW/TB 545W Solar Panel - Specs & Review | ComparePV" description: "ET Solar ET-M772BH545TW/TB 545W solar panel. Specs: 21.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/et-solar-et-m772bh545tw-tb" updated: 2026-09-11 --- # ET Solar ET-M772BH545TW/TB Efficiency leader, no clear weak spot 706 panels in the segment PERC 500-550 W ## Identity - **Manufacturer:** ET Solar - **Model:** ET-M772BH545TW/TB - **Series:** Elite PLUS PERC BIFACIAL - **Rated power:** 545 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 500-550 W (706 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 545 W | 535 W | Strong - top 12% | | | Module efficiency | 21.10% | 20.90% | Strong - top 20% | 9,297 | | Power density | 210.9 | 209.0 | Typical | 9,399 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 23% | 8,778 | | Weight (kg) | 28.0 kg | 28.4 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.10% | 20.90% | Strong - top 20% | 9,297 | | Power density | 210.9 | 209.0 | Typical | 9,399 | | Temperature coefficient | -0.340 | -0.350 | Strong - top 23% | 8,778 | | Weight per kWp | 51.4 | 53.0 | Typical | 4,754 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Strengths - **21.10% module efficiency** - Top 20% of the PERC 500-550 W segment, against a median of 20.90%. - **-0.340 %/°C temperature coefficient** - Top 23% of the PERC 500-550 W segment, against a median of -0.350. - **Best for:** Commercial, utility-scale, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 545 W - **Efficiency:** 21.10 % - **Voltage at Pmax (Vmp):** 41.80 V - **Current at Pmax (Imp):** 13.04 A - **Open-circuit voltage (Voc):** 49.75 V - **Short-circuit current (Isc):** 13.93 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.340 %/degC - **Temperature coefficient of Voc:** -0.257 %/degC - **Temperature coefficient of Isc:** 0.052 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2279 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 28.0 kg - **Area:** 2.58 m2 - **Power density:** 210.9 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 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:** 463 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9297 of 14005 | | Power density | 9399 of 14005 | | Temperature coefficient | 8778 of 14005 | | Weight | 4754 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Bifacial Gain up to +25% Energy Yield** - The bifacial PERC cell technology captures reflected irradiance from the ground surface (snow, light gravel, concrete). The manufacturer claims a rear-side energy gain of up to 25%, which in ground-mount installations with an albedo ≥0.3 measurably reduces the LCOE compared to monofacial modules of equivalent rated power. - **Temperature Coefficient of -0.30%/°C** - A Pmax temperature coefficient of -0.30%/°C is more favorable than the typical -0.35% to -0.37%/°C range for standard PERC modules. At a cell operating temperature of 65°C, this translates to approximately 1.5–2% higher instantaneous output relative to lower-cost PERC alternatives, resulting in a measurably higher annual energy yield in Central European climates. - **30-Year Linear Power Warranty, Degradation \<0.4%/year** - The manufacturer guarantees annual power degradation below 0.4%, ensuring retention of >88% of nominal power after 30 years. Comparable peers — Goldi Solar GS10-B144-TF and S-Energy SL65-72BGJ, both at 550 Wp — offer a standard 25-year power warranty. The extended warranty horizon improves cash-flow predictability in project finance models. - **Certified Resistance to PID, Salt Mist, and Ammonia** - The series carries verified resistance to potential-induced degradation (PID), and the module construction meets the requirements of IEC 61701 (salt mist corrosion) and IEC 62716 (ammonia resistance). This makes the series a well-justified choice for agri-PV installations, coastal solar farms, and industrial facilities where standard modules require additional certifications. - **Five Power Variants from 530–550 Wp within a Single Series** - The availability of five power bins (530/535/540/545/550 Wp) sharing identical mechanical dimensions simplifies string optimization in irregular-layout installations and reduces the number of SKUs required in distributor inventory. ## Cons - **No BNEF Tier 1 Status (Non-Bankable Manufacturer)** - ET Solar does not appear on the BNEF bankable manufacturers list (confirmed by context data: tier\_1\_bankable: false; the manufacturer is absent from both the Q2 2025 and Q4 2025 lists). For debt-financed or lease-structured projects and institutional investors, the absence of Tier 1 status means elevated financing risk or an inability to satisfy due diligence requirements. Direct peer IBC Solar benefits from strong bankability through the broader IBC group. - **Bankruptcy History and Documented Warranty Claim Issues** - ET Solar filed for bankruptcy and resumed operations after an approximately 20-month hiatus (per DIY Solar Power Forum and SolarReviews). Installers have reported difficulties obtaining warranty claim fulfillment following the company's restart. Given the declared 30-year power warranty, the risk to long-term service continuity is a material risk factor, particularly for commercial and industrial installations. - **Product Warranty of Only 12 Years** - The product warranty covering frames, cells, bypass diodes, and the junction box is limited to 12 years, while Tier 1 segment leaders — JA Solar, Jinko Solar, and Trina Solar — standardly offer a 25-year product warranty. Any mechanical failure occurring after year 12 places the cost of replacement or repair entirely on the system owner. ## About this series The ET Solar Elite PLUS PERC BIFACIAL series is an advanced solution for investors focusing on maximizing yields from every installed module. Thanks to the use of bifacial technology, these panels absorb energy not only directly from the sun but also from radiation reflected off the ground, allowing for an additional energy gain of up to 25 percent. The foundation of the design is **high-efficiency PERC monocrystalline cells**, which, combined with half-cut cell architecture, effectively reduce internal losses and minimize the risk of hot spots. The product solves the problem of limited space by offering **exceptional power density and a low temperature coefficient**, which translates into stable operation even on hot days. It is an ideal choice for photovoltaic farms, ground-mounted installations with high albedo, and modern carports. What sets them apart from the competition is **increased resistance to potential-induced degradation (PID)** and a reinforced construction resistant to extreme weather conditions, including salt mist and ammonia. By choosing the Elite PLUS series, you gain a **30-year linear power output warranty**, making this investment exceptionally safe and predictable over a long time horizon. This is premium-class technology that realistically lowers the LCOE index, ensuring **high efficiency in low light conditions** and a fast return on investment. ## Notable figures - Efficiency of 21.1% matches the \*\*PERC 500-550W\*\* median - At 210.9 W/m² power density, roof space requirements are typical for \*\*PERC 500-550W\*\* panels - Temperature coefficient of -0.34%/°C matches the \*\*PERC 500-550W\*\* median - Bifacial design (70% factor) captures reflected light - adds 4-10% yield on ground-mount or white roof - In the top 66% for efficiency among all PERC panels ## Questions ### How much additional energy does the rear side of ET Solar Elite PLUS PERC BIFACIAL panels produce? Bifacial technology allows the rear side of the module to absorb irradiance reflected from the ground surface. In the Elite PLUS PERC BIFACIAL series, the manufacturer declares an additional energy yield of up to 25 percent compared to a conventional monofacial module. The gain is greatest in installations over high-albedo surfaces such as gravel, concrete, or snow, where the albedo coefficient is significantly elevated. ### Are ET Solar Elite PLUS PERC BIFACIAL panels suitable for ground-mounted farms and carport structures? Yes, the Elite PLUS PERC BIFACIAL series is designed primarily for ground-mounted installations with high albedo and for carport structures. In such mounting configurations, the exposed rear side of the module fully exploits irradiance reflected from the ground. The reinforced construction, resistant to salt mist and ammonia, also makes the panels well suited for industrial and agricultural sites. ### What warranty is offered on the ET Solar Elite PLUS PERC BIFACIAL series? The Elite PLUS PERC BIFACIAL series is covered by a 12-year product warranty against material and workmanship defects, as well as a 30-year linear power output warranty. After 30 years of operation, the module retains at least 84.95 percent of its nominal power. The annual power degradation rate is below 0.4 percent, making this investment highly predictable from a financial perspective throughout the entire system lifetime. ### How do high summer temperatures affect the performance of ET Solar Elite PLUS PERC BIFACIAL panels? The Elite PLUS series features a low temperature coefficient for Pmax of approximately -0.34 percent per kelvin. This means that for every 10 °C rise in cell temperature, output power decreases by only 3.4 percent. This result is better than that of older polycrystalline technologies and ensures stable operation even on hot days when other modules experience a more pronounced drop in performance. ### How does the PERC half-cut cell technology used in the Elite PLUS series differ from standard monocrystalline cells? PERC cells incorporate an additional passivation layer on the rear surface that reflects unabsorbed photons back into the cell, thereby increasing conversion efficiency. Cutting the cells in half (half-cut) reduces internal resistance, lowers resistive losses, and improves tolerance to partial shading. The combination of both technologies in a 144-cell module delivers a noticeably higher energy yield than first-generation standard monocrystalline cells. ### Is ET Solar a Tier 1 manufacturer, and is the Elite PLUS series a safe 30-year investment? ET Solar does not appear in Bloomberg NEF Tier 1 rankings, which should be taken into account when assessing manufacturer financial risk. The company has been active in the market for many years and offers a 30-year linear power output warranty and a 12-year product warranty on the Elite PLUS series. Before purchasing, it is advisable to ask the distributor about additional warranty protections or insurance coverage in the event of difficulties enforcing warranty claims against the manufacturer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/panel-solar-et-solar-elite-plus-bidacial-530-550w-9ffd2643d63d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.7 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.7 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.6 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.5 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | -45 W, cooler, +3.4 pp | | [ET Solar ET-M772BH530TW/TB](https://comparepv.com/panel/et-solar-et-m772bh530tw-tb) | 530 W | -15 W, -0.6 pp | | [ET Solar ET-M772BH535TW/TB](https://comparepv.com/panel/et-solar-et-m772bh535tw-tb) | 535 W | -10 W, -0.4 pp | | [ET Solar ET-M772BH540TW/TB](https://comparepv.com/panel/et-solar-et-m772bh540tw-tb) | 540 W | -0.2 pp | | [ET Solar ET-M772BH550TW/TB](https://comparepv.com/panel/et-solar-et-m772bh550tw-tb) | 550 W | Very close match | | [ET Solar ET-M772BH555WW/WB](https://comparepv.com/panel/et-solar-et-m772bh555ww-wb) | 555 W | +10 W, +0.3 pp, -5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +105 W, cooler, +4.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +100 W, cooler, +3.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +95 W, cooler, +3.7 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +90 W, cooler, +3.5 pp | | [AIKO AIKO-A630-MAH72Dw](https://comparepv.com/panel/aiko-aiko-a630-mah72dw) | 630 W | +85 W, cooler, +3.3 pp | --- Source: https://comparepv.com/panel/et-solar-et-m772bh545tw-tb Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.