--- title: "DMEGC GH540M10T-B66HST 540W Solar Panel - Specs & Review | ComparePV" description: "DMEGC GH540M10T-B66HST 540W solar panel. Specs: 20.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh540m10t-b66hst" updated: 2026-09-11 --- # DMEGC GH540M10T-B66HST Middle of its segment, heavy for its output 140 panels in the segment N-type 500-550 W ## Identity - **Manufacturer:** DMEGC - **Model:** GH540M10T-B66HST - **Series:** GHxxxM10T-B66HST - **Rated power:** 540 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 500-550 W (140 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 540 W | 520 W | Strong - top 9% | | | Module efficiency | 20.90% | 22.54% | Weak - bottom 6% | 10,072 | | Power density | 209.0 | 225.3 | Weak - bottom 7% | 10,100 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.0 kg | 26.2 kg | Weak - bottom 3% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.90% | 22.54% | Weak - bottom 6% | 10,072 | | Power density | 209.0 | 225.3 | Weak - bottom 7% | 10,100 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 59.3 | 50.0 | Weak - bottom 3% | 12,071 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **59.3 kg per kWp** - Bottom 3% of the N-type 500-550 W segment, against a median of 50.0. Ranked 12,071st in the whole database. - **20.90% module efficiency** - Bottom 6% of the N-type 500-550 W segment, against a median of 22.54%. Ranked 10,072nd in the whole database. - **209.0 watts per square metre** - Bottom 7% of the N-type 500-550 W segment, against a median of 225.3. Ranked 10,100th in the whole database. - **Best for:** Residential, commercial, agrivoltaic and hot-climate. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 540 W - **Efficiency:** 20.90 % - **Voltage at Pmax (Vmp):** 39.80 V - **Current at Pmax (Imp):** 13.57 A - **Open-circuit voltage (Voc):** 47.62 V - **Short-circuit current (Isc):** 14.34 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:** N-type - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.0 kg - **Area:** 2.58 m2 - **Power density:** 209.0 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:** 472 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10072 of 14005 | | Power density | 10100 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 12071 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Low Annual Degradation Rate** - DMEGC N-type TOPCon modules exhibit a degradation rate of 0.42%/year versus the industry average of 0.7%/year (PV Evolution Labs 2024 data). After 30 years, the manufacturer guarantees retention of 87.4% of nominal power, translating into a measurably higher cumulative energy yield over the full operational lifetime of the system. - **Bifacial Double Glass – Rear-Side Energy Harvest** - The dual-glass construction combined with bifacial cell technology enables additional energy generation from albedo radiation reflected off the mounting surface. In ground-mount installations over light-colored substrates or white roofing membranes, the real-world yield gain is 5–15% depending on the surface reflectance coefficient. The glass backsheet also eliminates the risk of encapsulant delamination and backsheet corrosion. - **30-Year Linear Power Warranty** - The 30-year performance warranty with 87.4% power retention at end of term is among the longest available in the segment. By comparison, many standard Tier-1 offerings—such as the Heliene 144HC M10 SL Bifacial in the same 540 Wp power class—cap their power warranty at 25 years. The extended coverage reduces financial risk in commercial and industrial installations with long investment horizons. - **BNEF Tier-1 Manufacturer with a Track Record Since 1980** - DMEGC Solar maintains Tier-1 status per BloombergNEF at least through Q3 2025, confirming bankability—the modules' suitability for project finance without recourse. The company has been in operation since 1980, which reduces manufacturer insolvency risk over the warranty horizon compared to younger suppliers without an established credit history. - **N-type TOPCon Technology – Reduced LID/LeTID** - N-type cells are inherently resistant to Light-Induced Degradation (LID) typical of p-type PERC cells, and the TOPCon architecture further suppresses LeTID. This results in more stable output during the initial months of operation and a higher real-world energy yield relative to the declared STC power rating. ## Cons - **Series Discontinued (2026)** - The GHxxxM10T-B66HST series was discontinued in 2026 (production launch: 2023). This limits the availability of replacement modules in the event of failures or system expansions, and distributor support may become difficult once warehouse stock is depleted. For installations with a planned 25–30-year lifecycle, this represents a material risk factor. - **Module Efficiency Significantly Below Peer Competitors** - The maximum efficiency of this series is 20.9%, while direct competitors in the same 540 Wp power class achieve: Gokin GK-5-60HG – 24.4% (+3.5 pp), Horay Solar HS 199R-120 TC-D Delta – 23.1% (+2.2 pp). The 3.5 pp gap versus Gokin means approximately 17% more roof area is required to achieve the same peak power output, which is a real constraint in space-limited rooftop applications. - **15-Year Product Warranty – Below Market Trend** - The product warranty stands at 15 years, whereas newer DMEGC series (e.g., Infinity RT, 2024) and many premium-tier competitors already offer 20–25 years. The shorter coverage period for workmanship defects and mechanical damage increases the risk of out-of-warranty repair costs during the second half of the system's operational life. ## About this series The DMEGC GHxxxM10T-B66HST series features advanced photovoltaic modules based on **N-type TOPCon technology**, which sets new performance standards in variable weather conditions. Thanks to the use of an innovative **Double Glass** design, these panels demonstrate extreme resistance to potential-induced degradation and the negative effects of material aging, translating into a significantly longer lifespan for the entire installation. They solve the key problem of power drops at high temperatures by offering a low temperature coefficient, making them an excellent choice for increasingly hot Polish summers. The **high bifaciality** characteristic of this series allows for the generation of additional energy from reflected radiation, which is particularly important for ground-mounted systems or light roof membranes. This product is aimed at demanding business investors and single-family homeowners who prioritize maximum energy yield from limited surface areas. What distinguishes them from the competition is a unique combination of high power density with a **minimal LID effect**, ensuring stable power production and a faster return on investment. This is an uncompromising solution combining mechanical durability with modern aesthetics and the highest reliability in the premium sector. ## Notable figures - Efficiency of 20.9% is 1.6pp below the \*\*N-type 500-550W\*\* median (22.5%) - At 209.0 W/m², this panel generates 16.3 W/m² less per unit area than \*\*N-type 500-550W\*\* median (225.3 W/m²) - Temperature coefficient of -0.29%/°C matches the \*\*N-type 500-550W\*\* median - At 32.0 kg, this panel is 5.8 kg heavier than the \*\*N-type 500-550W\*\* median (26.2 kg) - more demanding for installation crews - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### Is the DMEGC GHxxxM10T-B66HST series still available for purchase? The GHxxxM10T-B66HST series has been discontinued and is no longer actively distributed by DMEGC. If you are planning a new installation, it is worth contacting your distributor to check for remaining stock or considering newer models from the same manufacturer's TOPCon lineup, which offer comparable or higher performance. ### What is N-type TOPCon technology and why do DMEGC GHxxxM10T-B66HST panels use it? N-type TOPCon (Tunnel Oxide Passivated Contact) is a cell architecture based on n-type silicon with an ultra-thin tunnel oxide layer that drastically reduces charge carrier recombination. In practice, this translates to higher module efficiency (above 22%), minimal LID (Light-Induced Degradation) at initial exposure, and a lower temperature coefficient compared to conventional PERC cells. For the end user, this means more kilowatt-hours generated annually from the same roof area. ### What warranty does the DMEGC GHxxxM10T-B66HST series carry and what does it cover? The manufacturer provides a 15-year product warranty covering material and workmanship defects, as well as a 30-year linear power output warranty. Under the power warranty, DMEGC guarantees that after 30 years the module will retain at least 87.4% of its nominal rated power. The annual degradation rate is approximately 0.4%, placing this series well below the industry-standard benchmark of 0.7% per year. ### Is it worthwhile to install the bifacial DMEGC GHxxxM10T-B66HST on a pitched roof? Yes, although the best bifacial gains are achieved with ground-mounted systems or installations over highly reflective white roofing membranes that redirect irradiance onto the rear glass. On a typical pitched roof with dark roof tiles, the rear-side energy contribution is lower, generally in the range of 5–10%. Regardless of orientation, the Double Glass construction provides additional benefits: superior resistance to moisture ingress, PID (Potential-Induced Degradation), and mechanical loading, all of which extend the service life of the installation. ### How do DMEGC GHxxxM10T-B66HST 540 W panels perform in summer under high-temperature conditions? N-type TOPCon technology features a lower temperature coefficient than standard PERC cells, typically around −0.30% per degree Celsius. This means that when a module heats up to 70 °C on a hot summer day, the GHxxxM10T-B66HST series loses proportionally less power output than older panel technologies. This characteristic is particularly relevant in Polish climatic conditions, where summer roof-surface temperatures regularly exceed 60 °C. ### Are DMEGC GHxxxM10T-B66HST 540 W panels compatible with standard inverters available in Poland? Yes, modules in this series operate within the input voltage ranges supported by widely used inverter brands such as Fronius, SMA, Huawei, and SolarEdge. With an open-circuit voltage (Voc) of approximately 49–51 V, stringing 20–25 modules in series yields DC string voltages in the range of 950–1,100 V, which falls within the specifications of most three-phase string inverters. Before finalizing the string configuration, always verify the inverter datasheet for the maximum allowable DC input voltage. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/6708d64d40bcd-a7e09fba8a34.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +4.1 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | -45 W, lighter, +3.9 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, lighter, +3.9 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.8 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, lighter, +3.7 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | -50 W, lighter, +3.6 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +3.6 pp | | [DMEGC GH285M10T-B36HST](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh285m10t-b36hst) | 285 W | -255 W, lighter, -9.9 pp | | [DMEGC GH290M10T-B36HST](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh290m10t-b36hst) | 290 W | -250 W, lighter, -9.7 pp | | [DMEGC GH295M10T-B36HST](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh295m10t-b36hst) | 295 W | -245 W, lighter, -9.5 pp | | [DMEGC GH300M10T-B36HST](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh300m10t-b36hst) | 300 W | -240 W, lighter, -9.3 pp | | [DMEGC GH400M10T-B48HST-385](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh400m10t-b48hst-385) | 385 W | -155 W, -6.0 pp | | [DMEGC GH400M10T-B48HST-390](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh400m10t-b48hst-390) | 390 W | -150 W, -5.8 pp | | [DMEGC GH400M10T-B48HST-395](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh400m10t-b48hst-395) | 395 W | -145 W, -5.6 pp | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +110 W, lighter, +4.3 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +105 W, lighter, +4.1 pp | --- Source: https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dmegc-solar-gh540m10t-b66hst 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.