--- title: "BYD MSTK-33 655 655W Solar Panel - Specs & Review | ComparePV" description: "BYD MSTK-33 655 655W solar panel. Specs: 21.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/byd-mstk-33-655" updated: 2026-09-11 --- # BYD MSTK-33 655 Strong in heat, short guarantee 320 panels in the segment PERC 650-700 W ## Identity - **Manufacturer:** BYD - **Model:** MSTK-33 655 - **Series:** AURO MSTK-33 - **Rated power:** 655 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 650-700 W (320 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 655 W | 660 W | Weak - bottom 25% | | | Module efficiency | 21.10% | 21.25% | Typical | 9,297 | | Power density | 210.9 | 212.5 | Weak - bottom 24% | 9,459 | | Temperature coefficient | -0.328 | -0.340 | Strong - top 2% | 8,526 | | Weight (kg) | 33.9 kg | 34.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.10% | 21.25% | Typical | 9,297 | | Power density | 210.9 | 212.5 | Weak - bottom 24% | 9,459 | | Temperature coefficient | -0.328 | -0.340 | Strong - top 2% | 8,526 | | Weight per kWp | 51.8 | 52.3 | Typical | 5,121 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 21% | 9,798 | ### Strengths - **-0.328 %/°C temperature coefficient** - Top 2% of the PERC 650-700 W segment, against a median of -0.340. Ranked 8,526th in the whole database. ### Watch out for - **25 year performance warranty** - Bottom 21% of the PERC 650-700 W segment, against a median of 30 yrs. - **210.9 watts per square metre** - Bottom 24% of the PERC 650-700 W segment, against a median of 212.5. - **Best for:** Residential, commercial and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 655 W - **Efficiency:** 21.10 % - **Voltage at Pmax (Vmp):** 37.95 V - **Current at Pmax (Imp):** 17.27 A - **Open-circuit voltage (Voc):** 45.58 V - **Short-circuit current (Isc):** 18.21 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.328 %/degC - **Temperature coefficient of Voc:** -0.254 %/degC - **Temperature coefficient of Isc:** 0.041 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 35 mm - **Weight:** 33.9 kg - **Area:** 3.11 m2 - **Power density:** 210.9 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:** 537 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9297 of 14005 | | Power density | 9459 of 14005 | | Temperature coefficient | 8526 of 14005 | | Weight | 5121 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **Tier-1 Manufacturer with Global Support Infrastructure** - BYD is rated Tier-1 Bankable by BNEF, has been operating since 1995, and ranks among the world's largest energy companies. This substantially reduces credit risk in project financing and ensures warranty support availability throughout the full 25-year operational lifetime. - **Bifacial Design – Measurable Additional Yield** - The bifacial module construction harvests energy from ground-reflected irradiance (albedo). On a typical white gravel or concrete surface (albedo ~0.3), this translates to a real-world gain of 5–15%, which for a 10 kWp system represents an additional 300–900 kWh per year. - **Efficiency Up to 21.73% – Top of Segment** - The highest-output variant (675 Wp) achieves 21.73% module efficiency, matching the best-in-class results for this power range: Neo Solar Power NESE 655-675 and AmoSolar AS645-675 (both at 21.73%). Trina Solar Vertex TSM-DE21 675W reaches 21.7%, trailing by 0.03 percentage points. - **Half-Cut Cell Architecture + Multi-Busbar** - Splitting each cell in half reduces operating current by 50%, lowering resistive I²R losses. Multi-busbar design (≥9 busbars) shortens current path length and reduces susceptibility to microcracks — a significant advantage for rooftop installations subject to thermal cycling. - **Stable Linear Degradation of 0.55%/Year Over 25 Years** - The guaranteed linear degradation rate is 0.55%/year — identical to the industry benchmark set by direct competitor Trina Solar TSM-DE21 (0.55%/year). Year-one power loss is ~2%, which is typical for P-type PERC technology and explicitly stated in the manufacturer's datasheet. ## Cons - **P-type PERC – Higher LID in Year 1** - P-type PERC cells exhibit light-induced degradation (LID) of approximately 2% in the first year, as confirmed by both the BYD MSTK-33 datasheet and the Trina TSM-DE21 datasheet. N-type TOPCon alternatives available in a comparable power range (e.g., the BYD AURO N series) limit this effect to below 1%, representing a real-world difference of approximately 100 kWh of generation in the first season for a 10 kWp system. - **Temperature Coefficient of -0.328%/°C** - A value of -0.328%/°C is competitive within the PERC segment, but noticeably inferior to N-type TOPCon modules (-0.28%/°C) and HJT modules (-0.24%/°C). During a Polish summer — with module temperatures reaching 65–70°C — this difference results in 5–10 kWh/kWp/year of additional thermal losses compared to an equivalent N-type module. ## About this series BYD AURO MSTK-33 panels are an advanced solution based on **N-type TOPCon cell technology**, which redefines efficiency standards in residential and commercial photovoltaic systems. This series was designed to maximize energy yields even in challenging lighting conditions, which directly translates into a faster return on investment for the prosumer. The use of **Half-Cut structure and Multi-Busbar technology** minimizes resistance losses and significantly increases the modules' resistance to micro-cracks resulting from mechanical stress. For demanding investors, the exceptional **Full Black aesthetics** are key, making the panels blend perfectly with modern roof architecture while maintaining the highest technical parameters. By choosing the AURO MSTK-33 series, the user receives a product with a reduced linear degradation rate, which guarantees stable power production for decades. What sets them apart from the competition is the precise **optimization for low LID and LeTID effects**, which effectively eliminates the problem of rapid power loss in the initial phase of operation. It is an ideal choice for those looking for a balance between technological innovation and the proven reliability of a brand associated with the global energy storage market. These modules form a solid foundation for every safe and efficient PV installation. ## Notable figures - Efficiency of 21.1% matches the \*\*PERC 650-700W\*\* median - At 210.9 W/m² power density, roof space requirements are typical for \*\*PERC 650-700W\*\* panels - Temperature coefficient of -0.33%/°C matches the \*\*PERC 650-700W\*\* median - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces - Ranked #9297 out of 14005 panels for efficiency in the database ## Questions ### What warranty does the BYD AURO MSTK-33 panel carry and what does it cover? The manufacturer provides a 12-year product warranty on the AURO MSTK-33 modules, covering material and workmanship defects. In addition, BYD guarantees a linear power output warranty for 25 years, ensuring that the panel retains at least 84.8% of its original nominal power at the end of that period. This is one of the more favorable warranty packages in its price segment, and BYD's financial strength as a global corporation provides genuine assurance that warranty claims will be honored. ### How much does the BYD AURO MSTK-33 panel weigh and can it be installed on a typical Polish roof? The BYD AURO MSTK-33 675W module weighs approximately 33.9 kg and measures 2384×1303×35 mm. This is a large-format module, so it is advisable to commission a structural load assessment of the roof before installation, especially on older buildings. On typical pitched roofs with rafters in good condition there are no obstacles in principle; however, the large dimensions require an experienced installation crew and appropriate equipment for lifting the panels into place. ### Do the BYD AURO MSTK-33 panels perform more efficiently thanks to bifacial technology, and when does this make sense? Yes, the AURO MSTK-33 is a bifacial module that generates energy from its rear surface as well, utilizing light reflected from the ground or rooftop substrate. The real-world bifacial gain is typically 5–15% and depends on the albedo of the surface beneath: a light-colored roofing membrane, gravel, or snow deliver the best results. In ground-mounted systems on high-albedo substrates, bifacial technology pays back noticeably faster than in a conventional rooftop installation over dark roof tiles. ### What is the peak power output of the BYD AURO MSTK-33 panel and what does that mean in practice for a household? The module's peak power output is 675 Wp at a module efficiency of up to 21.73%. For a typical single-family home consuming 4,000–5,000 kWh per year, 4–6 of these panels are sufficient to cover the majority of the energy demand. The Half-Cut cell architecture combined with Multi-Busbar technology reduces internal resistive losses, meaning the rated power is reliably achieved under optimal irradiance conditions. ### Will the BYD AURO MSTK-33 perform well on a roof with partial shading or an unfavorable orientation? Half-Cut technology splits each cell in half, so shading on one section of the module does not suppress the output of the remaining sections as severely as in conventional full-cell modules. The AURO MSTK-33 is relatively shade-tolerant; however, in the presence of significant obstructions such as a chimney or dormer windows, adding power optimizers or microinverters is worth considering. A south-west or south-east orientation typically results in a 10–20% yield reduction compared to a true south-facing installation. ### Is BYD a reliable PV panel manufacturer and where is the AURO MSTK-33 series produced? BYD (Build Your Dreams) is a Chinese Tier 1 corporation, consistently ranked by BloombergNEF (BNEF) among the most financially stable photovoltaic manufacturers in the world. The AURO MSTK-33 panels are manufactured in China; however, BYD also operates production facilities in other countries and has been supplying its modules to European markets for many years. Tier 1 classification signifies a verified ability to fulfill long-term warranty obligations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/byd-mstk-33-dde90fc0804f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, +4.1 pp, +5 yr warranty | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, +3.9 pp, +5 yr warranty | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, +3.9 pp, +5 yr warranty | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, +3.8 pp, +5 yr warranty | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +3.7 pp | | [BYD MSBK-33 645](https://comparepv.com/panel/byd-msbk-33-645) | 645 W | Heavier, -0.3 pp, +5 yr warranty | | [BYD MSBK-33 650](https://comparepv.com/panel/byd-msbk-33-650) | 650 W | Heavier, +5 yr warranty | | [BYD MSTK-33 660](https://comparepv.com/panel/byd-mstk-33-660) | 660 W | Very close match | | [BYD MSBK-33 665](https://comparepv.com/panel/byd-msbk-33-665) | 665 W | Heavier, +0.3 pp, +5 yr warranty | | [BYD MSBK-33 670](https://comparepv.com/panel/byd-msbk-33-670) | 670 W | Heavier, +0.5 pp, +5 yr warranty | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +150 W, cooler, +4.0 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +145 W, cooler, +3.8 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +140 W, cooler, +3.7 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +135 W, cooler, +3.5 pp | --- Source: https://comparepv.com/panel/byd-mstk-33-655 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.