--- title: "DMEGC DM645M10T-B78HSW 645W Solar Panel - Specs & Review | ComparePV" description: "DMEGC DM645M10T-B78HSW 645W solar panel. Specs: 23.10% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dmegc-hengdian-group-dm645m10t-b78hsw" updated: 2026-09-11 --- # DMEGC DM645M10T-B78HSW Solid all-round for its segment 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** DMEGC - **Model:** DM645M10T-B78HSW - **Series:** DMxxxM10T-B78HSW - **Rated power:** 645 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 645 W | 620 W | Strong - top 3% | | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 230.7 | 227.7 | Typical | 1,654 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 33.5 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 23.10% | 22.80% | Typical | 1,570 | | Power density | 230.7 | 227.7 | Typical | 1,654 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 51.9 | 53.1 | Typical | 5,361 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial and utility-scale. ## Specification ### Electrical - **Rated power (Pmax):** 645 W - **Efficiency:** 23.10 % - **Voltage at Pmax (Vmp):** 48.05 V - **Current at Pmax (Imp):** 13.44 A - **Open-circuit voltage (Voc):** 57.90 V - **Short-circuit current (Isc):** 14.19 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 42 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 33.5 kg - **Area:** 2.80 m2 - **Power density:** 230.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 564 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 1570 of 14005 | | Power density | 1654 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 5361 of 14005 | | Warranty | 21 of 14005 | ## Pros - **23.3% Efficiency – Among the Top Performers in Its Class** - A peak efficiency of 23.3% places the series on par with the Astronergy ASTRO N5 (23.3%) and above the BYD AURO N NLBK-39 (23.25%). For C&I installations with limited roof or ground space, this directly translates to higher kWh/m² yield without increasing the system footprint. - **Low Temperature Coefficient of -0.29%/°C** - N-type TOPCon cells exhibit a significantly lower power loss at elevated temperatures than typical PERC modules (-0.35 to -0.37%/°C). Under Polish summer conditions (module temperature 50–65°C), this difference realistically results in 3–5% higher seasonal energy output compared to older technologies. - **30-Year Linear Power Warranty at ≥87.4%** - The manufacturer guarantees ≥99% of rated power in year 1, followed by a maximum degradation rate of 0.4%/year, with a minimum floor of 87.4% after 30 years. This specification is comparable to Jinko Tiger Neo and Astronergy and minimizes investment risk in non-recourse-financed utility-scale projects. - **Bankability: Tier 1 BNEF, S&P Global, Top 5 Globally** - DMEGC maintained Tier 1 status in the BloombergNEF Q3 2025 ranking and achieved Tier 1 classification from S&P Global. Wood Mackenzie's 2025 ranking placed DMEGC 5th among global module manufacturers (H1 2025 shipments: 13.4 GW, +64% YoY), ensuring lender acceptance in project finance transactions. - **Bi-Glass Construction with 80% Bifaciality (φPmax 80±5%)** - The glass-glass encapsulation provides resistance to moisture, ammonia, and thermal cycling — critical for agri-PV and ground-mounted installations. An 80% bifaciality factor is the premium-class standard for utility modules and enables a real energy gain of 10–20% depending on ground albedo. ## Cons - **Efficiency Below the Segment Leader** - The Jinko Solar Tiger Neo 66HL4M-BDX achieves 24.06% efficiency at the same maximum power of 650 W — a 0.76 percentage point advantage over DMEGC (23.3%). In projects with strict area constraints or where string layout optimization is critical, this gap may tip the decision toward an alternative. - **15-Year Product Warranty – Below the Premium Standard** - Jinko Solar and BYD offer 25-year product warranties (materials and workmanship) on comparable TOPCon series. DMEGC's 15-year term is commercially acceptable, but may be a negative factor in utility tenders or during project assessment by conservative lenders requiring full coverage of the loan repayment period. ## About this series The DMEGC DMxXXM10T-B78HSW series are bifacial modules in a bi-glass configuration, designed for installations where real energy gain matters as much as catalog parameters. The application of **N-type monocrystalline TOPCon technology** helps maintain high performance over time and minimizes typical losses found in older designs. Thanks to the **dual-glass structure**, the modules are better prepared for challenging environmental conditions-from humidity and ammonia to wider temperature fluctuations, which is especially important for projects deployed for years. Another key advantage is **bifaciality**, which allows using reflected light from the ground, increasing energy production in PV farms, ground-mounted systems, and bright commercial rooftops. The series focuses on **high mechanical durability** and operational stability, translating to lower warranty claim risks and a more predictable energy cost over the entire lifecycle. This makes it an excellent choice for C&I and utility investors aiming to maximize yield on limited surfaces and enhance project profitability. ## Notable figures - Efficiency of 23.1% matches the \*\*TOPCon 600-650W\*\* median - Power density of 230.7 W/m² packs 3.0 W/m² more into the same footprint vs \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface - In the top 11% for efficiency among all TOPCon panels ## Questions ### What warranty does the DMEGC DMxxxM10T-B78HSW series offer? The DMxxxM10T-B78HSW series is backed by a 15-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. According to the manufacturer's datasheets, after 30 years of operation the module is guaranteed to retain at least 87.4% of its nominal power. This is among the most competitive warranty standards in the utility and C&I module segment, and directly contributes to predictable revenue streams over the full lifetime of the installation. ### What is TOPCon technology and why does the DMxxxM10T-B78HSW series use it? TOPCon (Tunnel Oxide Passivated Contact) is a next-generation N-type cell technology that uses an ultra-thin tunnel oxide passivation layer to significantly reduce charge carrier recombination. In practice, this translates to higher conversion efficiency — modules in this series achieve up to 23.3% — and a low temperature coefficient of approximately -0.29%/°C. Compared to conventional PERC cells, TOPCon exhibits slower power degradation over time, which is particularly significant when modeling 30-year energy yield forecasts. ### How does bifaciality work in the DMEGC DMxxxM10T-B78HSW panels, and when does it genuinely pay off? Bifacial modules in this series generate electricity from both the front and rear surfaces by capturing irradiance reflected from the ground or mounting surface (albedo effect). The greatest yield gains are achieved with high-albedo surfaces: light-colored gravel ballast, white roofing membranes, snow cover, or sand can contribute anywhere from a few percent to more than 10% additional energy production. In utility-scale ground-mounted PV plants with adequate mounting height, the bifacial gain is particularly pronounced. On dark or vegetated rooftops, the benefit is marginal. ### Does the bi-glass construction of the DMxxxM10T-B78HSW series affect module durability? Yes, the dual-glass (bi-glass) structure eliminates the rear encapsulant backsheet, which in conventional modules is the weakest link in terms of moisture vapor transmission and UV-induced degradation. The dual-glass configuration also provides superior resistance to ammonia exposure, which is especially relevant for installations near livestock facilities. Furthermore, the all-glass construction better withstands large thermal cycling ranges and mechanical load stresses. The trade-off is a higher module weight of approximately 33.5 kg, which must be factored into the structural design of the mounting system. ### Are DMEGC DMxxxM10T-B78HSW panels suitable for industrial installations and utility-scale PV plants? Yes, the DMxxxM10T-B78HSW series is specifically designed for the C&I (commercial & industrial) and utility segments. Peak power output of up to 650 Wp combined with high module efficiency allows maximum energy harvest on constrained footprints. The bifacial design and bi-glass construction perform particularly well in ground-mounted installations, flat industrial rooftops with light-colored membranes, and utility-scale PV farms. DMEGC holds Tier 1 bankability status according to Bloomberg NEF, which simplifies the process of securing project financing for large-scale developments. ### How do DMEGC DMxxxM10T-B78HSW panels perform in high-temperature conditions? The N-type TOPCon technology used in this series delivers a power temperature coefficient of approximately -0.29%/°C, meaning the module loses just under 0.3% of its output for every degree Celsius the cell temperature rises above 25°C. This is a measurably better result than typical PERC modules, which range from -0.34 to -0.37%/°C. In real-world summer conditions, when cell temperatures commonly reach 55–70°C, the DMxxxM10T-B78HSW modules generate more energy than legacy PERC designs of equivalent nominal power rating. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/66b9d617a95bf-2cbfd6df053d.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +35 W, lighter, +2.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +30 W, lighter, +1.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +50 W, cooler, +1.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.7 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.7 pp | | [DMEGC DM630M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm630m10t-b78hsw) | 630 W | -15 W, -0.6 pp | | [DMEGC DM635M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm635m10t-b78hsw) | 635 W | -10 W, -0.4 pp | | [DMEGC DM640M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm640m10t-b78hsw) | 640 W | -0.2 pp | | [DMEGC DM650M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm650m10t-b78hsw) | 650 W | Very close match | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +55 W, cooler, +1.9 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +25 W, cooler, +1.7 pp | --- Source: https://comparepv.com/panel/dmegc-hengdian-group-dm645m10t-b78hsw 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.