--- title: "DMEGC DM625G12RT-B66HSW vs DMEGC DM635G12RT-B66HSW - Solar Panel Comparison | ComparePV" description: "Compare DMEGC DM625G12RT-B66HSW vs DMEGC DM635G12RT-B66HSW side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm635g12rt-b66hsw" updated: 2026-09-11 --- # DMEGC DM625G12RT-B66HSW vs DMEGC DM635G12RT-B66HSW DM635G12RT-B66HSW leads on the differences that matter The largest is module efficiency: 0.40 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DMEGC DM625G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw) | [DMEGC DM635G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm635g12rt-b66hsw) | | Manufacturer | DMEGC | DMEGC | | Power | 625 Wp | 635 Wp | | Efficiency | 23.10 % | 23.50 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DM625G12RT-B66HSW | DM635G12RT-B66HSW | Difference | | --- | --- | --- | --- | | Module efficiency | 23.10 % | 23.50 % | +0.40 pp for DM635G12RT-B66HSW | | Power density | 231.4 Wp/m² | 235.1 Wp/m² | +3.7 Wp/m² for DM635G12RT-B66HSW | | Rated power | 625 Wp | 635 Wp | +10 W for DM635G12RT-B66HSW | ## Every compared parameter | Parameter | DM625G12RT-B66HSW | DM635G12RT-B66HSW | | --- | --- | --- | | Rated power | 625 Wp | 635 Wp | | Module efficiency | 23.10 % | 23.50 % | | Power density | 231.4 Wp/m² | 235.1 Wp/m² | | Open-circuit voltage | 49.29 V | 49.69 V | | Voltage at max power | 41.05 V | 41.45 V | | Short-circuit current | 16.17 A | 16.29 A | | Current at max power | 15.25 A | 15.35 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 32.3 kg | 32.3 kg | | Weight per kWp | 51.7 kg/kWp | 50.9 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 | 132 | 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, DM625G12RT-B66HSW:** 20,970 kWh - **Cumulative output, DM635G12RT-B66HSW:** 21,306 kWh - **Gap:** 336 kWh ## Output when hot | Condition | Cell temperature | DM625G12RT-B66HSW | DM635G12RT-B66HSW | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 625 W | 635 W | 100.0% of rated power | | Cool, bright day | 40 °C | 598 W | 607 W | 95.7% of rated power | | Typical summer roof | 55 °C | 571 W | 580 W | 91.3% of rated power | | Hot roof | 70 °C | 543 W | 552 W | 87.0% of rated power | ## Against the whole database | Measure | DM625G12RT-B66HSW | DM635G12RT-B66HSW | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,570 | #716 | 14,005 | DM635G12RT-B66HSW leads by 854 places | | Power density | #1,513 | #741 | 14,005 | DM635G12RT-B66HSW leads by 772 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #5,050 | #4,252 | 14,005 | DM635G12RT-B66HSW leads by 798 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,863 | #1,437 | 14,005 | DM635G12RT-B66HSW leads by 426 places | ## Questions ### Which panel is better: DMEGC DM625G12RT-B66HSW or DMEGC DM635G12RT-B66HSW? According to our database: **DMEGC DM635G12RT-B66HSW** has higher module efficiency (**23.50%** vs **23.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DMEGC DM625G12RT-B66HSW and DMEGC DM635G12RT-B66HSW? **DMEGC DM625G12RT-B66HSW** has a module efficiency of **23.10%**, while **DMEGC DM635G12RT-B66HSW** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DMEGC DM625G12RT-B66HSW use vs DMEGC DM635G12RT-B66HSW? **DMEGC DM625G12RT-B66HSW** uses **TOPCon** cells; **DMEGC DM635G12RT-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 DM625G12RT-B66HSW and DMEGC DM635G12RT-B66HSW? **DMEGC DM625G12RT-B66HSW** has a **30 years** power warranty; **DMEGC DM635G12RT-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 DM625G12RT-B66HSW and DMEGC DM635G12RT-B66HSW bifacial panels? Both **DMEGC DM625G12RT-B66HSW** and **DMEGC DM635G12RT-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 DM625G12RT-B66HSW vs DMEGC DM630G12RT-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm630g12rt-b66hsw) - One difference: module efficiency - [DMEGC DM625G12RT-B66HSW vs DMEGC DM720G12T-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/dmegc-hengdian-group-dm720g12t-b66hsw) - 6 differences, the largest is rated power - [DMEGC DM625G12RT-B66HSW vs DMEGC DM715G12T-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/dmegc-hengdian-group-dm715g12t-b66hsw) - 6 differences, the largest is rated power - [DMEGC DM625G12RT-B66HSW vs DMEGC DM710G12T-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/dmegc-hengdian-group-dm710g12t-b66hsw) - 7 differences, the largest is rated power - [DMEGC DM625G12RT-B66HSW vs DMEGC DM705G12T-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/dmegc-hengdian-group-dm705g12t-b66hsw) - 8 differences, the largest is rated power - [DMEGC DM625G12RT-B66HSW vs DMEGC DM700G12T-B66HSW](https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/dmegc-hengdian-group-dm700g12t-b66hsw) - 9 differences, the largest is rated power --- Source: https://comparepv.com/compare/hengdian-group-dmegc-magnetics-co-ltd-dm625g12rt-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm635g12rt-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.