--- title: "DMEGC DM635M10T-B78HSW vs DMEGC DM715G12T-B66HSW - Solar Panel Comparison | ComparePV" description: "Compare DMEGC DM635M10T-B78HSW vs DMEGC DM715G12T-B66HSW side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm715g12t-b66hsw" updated: 2026-09-11 --- # DMEGC DM635M10T-B78HSW vs DMEGC DM715G12T-B66HSW DM715G12T-B66HSW leads on the differences that matter The largest is rated power: 80 W more power. 8 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DMEGC DM635M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm635m10t-b78hsw) | [DMEGC DM715G12T-B66HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm715g12t-b66hsw) | | Manufacturer | DMEGC | DMEGC | | Power | 635 Wp | 715 Wp | | Efficiency | 22.70 % | 23.00 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DM635M10T-B78HSW | DM715G12T-B66HSW | Difference | | --- | --- | --- | --- | | Rated power | 635 Wp | 715 Wp | +80 W for DM715G12T-B66HSW | | Weight | 33.5 kg | 37.7 kg | -4.2 kg for DM635M10T-B78HSW | | Open-circuit voltage | 57.50 V | 49.02 V | 8.48 V apart | | Short-circuit current | 14.09 A | 18.56 A | 4.47 A apart | | Module area | 2.795 m² | 3.106 m² | 0.311 m² apart | | Module efficiency | 22.70 % | 23.00 % | +0.30 pp for DM715G12T-B66HSW | | Power density | 227.2 Wp/m² | 230.2 Wp/m² | +3.0 Wp/m² for DM715G12T-B66HSW | | Voltage at max power | 47.67 V | 40.93 V | 6.74 V apart | | Current at max power | 13.34 A | 17.50 A | 4.16 A apart | | Cell count | 156 | 132 | 24 cells apart | | Dimensions | 2465x1134x30 mm | 2384x1303x33 mm | 2465x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | DM635M10T-B78HSW | DM715G12T-B66HSW | | --- | --- | --- | | Rated power | 635 Wp | 715 Wp | | Module efficiency | 22.70 % | 23.00 % | | Power density | 227.2 Wp/m² | 230.2 Wp/m² | | Open-circuit voltage | 57.50 V | 49.02 V | | Voltage at max power | 47.67 V | 40.93 V | | Short-circuit current | 14.09 A | 18.56 A | | Current at max power | 13.34 A | 17.50 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x30 mm | 2384x1303x33 mm | | Module area | 2.795 m² | 3.106 m² | | Weight | 33.5 kg | 37.7 kg | | Weight per kWp | 52.8 kg/kWp | 52.7 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 132 | | Bifacial | Yes | Yes | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.290 %/°C), so a warmer roof scales both curves by the same factor: the totals fall together and neither panel gains on the other. - **Cumulative output, DM635M10T-B78HSW:** 21,306 kWh - **Cumulative output, DM715G12T-B66HSW:** 23,990 kWh - **Gap:** 2,684 kWh ## Output when hot | Condition | Cell temperature | DM635M10T-B78HSW | DM715G12T-B66HSW | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 715 W | 100.0% of rated power | | Cool, bright day | 40 °C | 607 W | 684 W | 95.7% of rated power | | Typical summer roof | 55 °C | 580 W | 653 W | 91.3% of rated power | | Hot roof | 70 °C | 552 W | 622 W | 87.0% of rated power | ## Against the whole database | Measure | DM635M10T-B78HSW | DM715G12T-B66HSW | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,919 | 14,005 | DM715G12T-B66HSW leads by 1,388 places | | Power density | #3,252 | #2,018 | 14,005 | DM715G12T-B66HSW leads by 1,234 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #6,429 | #6,393 | 14,005 | DM715G12T-B66HSW leads by 36 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,913 | #450 | 14,005 | DM715G12T-B66HSW leads by 1,463 places | ## Questions ### Which panel is better: DMEGC DM635M10T-B78HSW or DMEGC DM715G12T-B66HSW? According to our database: **DMEGC DM715G12T-B66HSW** has higher module efficiency (**23.00%** vs **22.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DMEGC DM635M10T-B78HSW and DMEGC DM715G12T-B66HSW? **DMEGC DM635M10T-B78HSW** has a module efficiency of **22.70%**, while **DMEGC DM715G12T-B66HSW** is **23.00%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DMEGC DM635M10T-B78HSW use vs DMEGC DM715G12T-B66HSW? **DMEGC DM635M10T-B78HSW** uses **TOPCon** cells; **DMEGC DM715G12T-B66HSW** uses **TOPCon**. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on DMEGC DM635M10T-B78HSW and DMEGC DM715G12T-B66HSW? **DMEGC DM635M10T-B78HSW** has a **30 years** power warranty; **DMEGC DM715G12T-B66HSW** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ### Are DMEGC DM635M10T-B78HSW and DMEGC DM715G12T-B66HSW bifacial panels? Both **DMEGC DM635M10T-B78HSW** and **DMEGC DM715G12T-B66HSW** are bifacial - they capture reflected light from the ground, which can add 5**-15%** more annual energy on ground-mount or elevated rooftop installations with a light surface beneath. ## Related comparisons - [DMEGC DM635M10T-B78HSW vs DMEGC DM650M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm650m10t-b78hsw) - 3 differences, the largest is module efficiency - [DMEGC DM635M10T-B78HSW vs DMEGC DM645M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm645m10t-b78hsw) - 3 differences, the largest is module efficiency - [DMEGC DM635M10T-B78HSW vs DMEGC DM640M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm640m10t-b78hsw) - One difference: module efficiency - [DMEGC DM635M10T-B78HSW vs DMEGC DM630M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm630m10t-b78hsw) - One difference: module efficiency - [DMEGC DM635M10T-B78HSW vs DMEGC DM600M10T-B72HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dmegc-magnetics-co-ltd-dm600m10t-b72hsw) - 9 differences, the largest is rated power - [DMEGC DM635M10T-B78HSW vs DMEGC DM595M10T-B72HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dmegc-magnetics-co-ltd-dm595m10t-b72hsw) - 9 differences, the largest is rated power --- Source: https://comparepv.com/compare/dmegc-hengdian-group-dm635m10t-b78hsw/dmegc-hengdian-group-dm715g12t-b66hsw Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.