--- title: "DMEGC DM605G12RT-B66HSW 605W Solar Panel - Specs & Review | ComparePV" description: "DMEGC DM605G12RT-B66HSW 605W solar panel. Specs: 22.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/dmegc-dm605g12rt-b66hsw" updated: 2026-09-11 --- # DMEGC DM605G12RT-B66HSW Middle of its segment, modest efficiency 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** DMEGC - **Model:** DM605G12RT-B66HSW - **Series:** DMxxxG12RT-B66HSW - **Rated power:** 605 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) | 605 W | 620 W | Weak - bottom 15% | | | Module efficiency | 22.40% | 22.80% | Weak - bottom 23% | 4,774 | | Power density | 224.0 | 227.7 | Weak - bottom 23% | 4,780 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 32.3 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 | 22.40% | 22.80% | Weak - bottom 23% | 4,774 | | Power density | 224.0 | 227.7 | Weak - bottom 23% | 4,780 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 53.4 | 53.1 | Typical | 7,291 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **22.40% module efficiency** - Bottom 23% of the TOPCon 600-650 W segment, against a median of 22.80%. - **224.0 watts per square metre** - Bottom 23% of the TOPCon 600-650 W segment, against a median of 227.7. - **Best for:** Residential, commercial, utility-scale and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 605 W - **Efficiency:** 22.40 % - **Voltage at Pmax (Vmp):** 40.25 V - **Current at Pmax (Imp):** 15.03 A - **Open-circuit voltage (Voc):** 48.49 V - **Short-circuit current (Isc):** 15.93 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:** 132 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.3 kg - **Area:** 2.70 m2 - **Power density:** 224.0 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:** 529 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4774 of 14005 | | Power density | 4780 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 7291 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Low temperature coefficient: -0.29%/°C** - A Pmax temperature coefficient of -0.29%/°C is notably more favorable than the typical range for P-type PERC modules (-0.34 to -0.36%/°C). Under Polish summer conditions—with module temperatures reaching 60–70°C—this translates to a real-world energy yield gain of 2–4% compared to older technology. - **Up to 23% efficiency – top of the segment** - The 620 Wp variant achieves 23% module efficiency, matching direct competitors (HT-SAAE HT66-18X(ND)-F: 23%, Weran Solar LR7-72HTH: 23%). The G12RT rectangular cell technology with 16BB and SMBB interconnection (132 half-cut cells) maximizes active silicon area within a 2382×1134 mm frame. - **Bifacial double glass with 80±5% bifaciality** - Dual tempered glass (2 mm) eliminates the risk of PID, microcracks, and degradation caused by moisture or ammonia. A bifaciality factor of 80±5% means that at ground albedo of 20–30%, the module generates a real-world 8–12% more energy than a monofacial equivalent—at no additional cost in roof area. - **Low degradation: ≤0.4%/year, ≥87.4% after 30 years** - The guaranteed linear power degradation of ≤1% in year 1 and ≤0.4%/year in subsequent years ensures a minimum of 87.4% of rated power after 30 years of operation. This figure is on par with leading Tier-1 manufacturers and is critical for IRR calculations in commercial projects with a 25+ year horizon. - **BNEF Tier 1 + Kiwa PVEL Top Performer 2025** - DMEGC has maintained BloombergNEF Tier-1 status for at least 6 consecutive years (confirmed in the Q3 2025 ranking), ensuring bankability for externally financed projects. Independent Kiwa PVEL testing (Scorecard 2025) confirms above-average module reliability across mechanical stress and environmental test sequences. ## Cons - **Product warranty of only 15 years** - The product warranty (covering defects and physical damage) is 15 years, while leading Tier-1 manufacturers in this segment (LONGi, JA Solar, Canadian Solar, Trina Solar) standardly offer 25–30 years. For projects financed with bank debt carrying a 20+ year repayment period, this may be an eliminating criterion or require additional insurance coverage. ## About this series The DMEGC DMxxxG12RT-B66HSW module series defines a new standard of efficiency thanks to the use of innovative N-type TOPCon cells in a rectangular format. The use of **G12RT rectangular cell technology** allows for much denser silicon packing within the frame, which directly translates into higher efficiency without the need to increase the panel dimensions. The **bifacial double glass** design, based on dual glass, eliminates the risk of micro-cracks and guarantees extreme resistance to degradation caused by moisture or ammonia. This solves the problem of long-term power loss, offering investors full financial security. A key differentiator is the **low temperature coefficient**, which makes the panels work more effectively in full sun than traditional P-type solutions. This series is dedicated to demanding residential installations and large-scale commercial projects, where maximizing yields from every square meter of roof or ground is essential. Thanks to **high resistance to mechanical loads**, the modules handle heavy snow and strong winds perfectly, which sets them apart from competitors offering less rigid structures. Choosing this series is an investment in energy stability and the technology of tomorrow, which effectively minimizes transmission losses and optimizes cooperation with modern inverters. ## Notable figures - Efficiency of 22.4% matches the \*\*TOPCon 600-650W\*\* median - Power density of 224.0 W/m² is 3.7 W/m² below \*\*TOPCon 600-650W\*\* median (227.7 W/m²) - needs more roof space - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - Ranked #4774 out of 14005 panels for efficiency in the database ## Questions ### What warranty covers the DMEGC DMxxxG12RT-B66HSW panels and what exactly does it include? The DMxxxG12RT-B66HSW series is backed by a 15-year product warranty covering manufacturing defects and workmanship, along with a 30-year linear power output warranty. In practical terms, this means the panel is guaranteed to retain at least 87.4% of its nominal power after 30 years, with an annual degradation rate not exceeding 0.4% and no more than 1% in the first year. This is one of the longest warranty packages in the industry and reflects the manufacturer's confidence in the durability of N-type TOPCon technology. ### Is the DMEGC DMxxxG12RT-B66HSW suitable for rooftop installations with partial shading or for ground-mounted systems? Yes. The bifacial double-glass construction with G12RT cells allows the module to harvest energy from both the front and rear sides (bifaciality factor of approximately 80%), which is especially advantageous in ground-mounted systems with light-colored surfaces or gravel substrates. For rooftop installations subject to partial shading, the choice of an appropriate inverter or power optimizers is critical, as the module itself does not include built-in microinverters. ### How do G12RT cells differ from standard G12 cells in solar panels? G12RT cells have a rectangular format, as opposed to the square shape of conventional G12 cells. This geometry allows for denser packing within a module frame of identical external dimensions, reducing inactive surface area. The result is a higher module efficiency of up to 23.5–24.4% within the same footprint, which directly translates into more kilowatt-hours per square meter of installed capacity. ### How does the DMEGC DMxxxG12RT-B66HSW 620 Wp panel perform on hot days when temperatures exceed 35°C? N-type TOPCon technology features a low temperature coefficient for Pmax of approximately -0.30%/°C. This means that at a cell temperature of, for example, 65°C — typical during summer — the panel loses around 12% of its rated power output, whereas older P-type panels typically lose 13–15% under the same conditions. Over the course of a year, this translates into measurably higher energy yields at no additional cost. ### Are the DMEGC DMxxxG12RT-B66HSW modules rated for snow loads and high wind pressure under Polish climatic conditions? Yes. The double-glass construction — consisting of two panes of 2 mm tempered glass — provides excellent mechanical strength. According to manufacturer specifications, the panels are rated for a snow load of up to 5,400 Pa and a wind pressure of up to 2,400 Pa, meeting the standards applicable in Poland including mountainous regions. The absence of a rear backsheet also eliminates the risk of delamination caused by large fluctuations in humidity. ### Is DMEGC a reputable manufacturer and are the DMxxxG12RT-B66HSW panels available on the market? DMEGC Solar is a Chinese manufacturer ranked as a Tier 1 supplier according to the BNEF bankability list, which confirms both financial credibility and verified manufacturing quality. The DMxxxG12RT-B66HSW series is currently in active production and available through distributors in Poland and across Europe. The manufacturer regularly updates the power range of the series — from 610 Wp to 665 Wp depending on the variant — so it is advisable to confirm the availability of a specific model with your supplier before placing an order. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/66bdc1d72c547-bda8dcafef19.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +45 W, lighter, +2.8 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | +40 W, lighter, +2.6 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -45 W, lighter, +2.4 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | +35 W, lighter, +2.4 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | -50 W, lighter, +2.2 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | +30 W, lighter, +2.2 pp | | [DMEGC DM610G12RT-B66HSW](https://comparepv.com/panel/dmegc-dm610g12rt-b66hsw) | 610 W | +0.2 pp | | [DMEGC DM615G12RT-B66HSW](https://comparepv.com/panel/dmegc-dm615g12rt-b66hsw) | 615 W | +10 W, +0.4 pp | | [DMEGC DM620G12RT-B66HSW](https://comparepv.com/panel/dmegc-dm620g12rt-b66hsw) | 620 W | +15 W, +0.6 pp | | [DMEGC DM625G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw) | 625 W | +20 W, +0.7 pp | | [DMEGC DM630G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm630g12rt-b66hsw) | 630 W | +25 W, +0.9 pp | | [DMEGC DM635G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm635g12rt-b66hsw) | 635 W | +30 W, +1.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +75 W, lighter, +2.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +70 W, lighter, +2.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +95 W, cooler, +2.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +90 W, cooler, +2.5 pp | --- Source: https://comparepv.com/panel/dmegc-dm605g12rt-b66hsw 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.