--- title: "DMEGC DM645M10T-B78HSW vs DMEGC DM695G12T-B66HSW - Solar Panel Comparison | ComparePV" description: "Compare DMEGC DM645M10T-B78HSW vs DMEGC DM695G12T-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-dm645m10t-b78hsw/dmegc-hengdian-group-dm695g12t-b66hsw" updated: 2026-09-11 --- # DMEGC DM645M10T-B78HSW vs DMEGC DM695G12T-B66HSW DM645M10T-B78HSW leads on the differences that matter The largest is module efficiency: 0.70 pp more efficient. 7 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DMEGC DM645M10T-B78HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm645m10t-b78hsw) | [DMEGC DM695G12T-B66HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm695g12t-b66hsw) | | Manufacturer | DMEGC | DMEGC | | Power | 645 Wp | 695 Wp | | Efficiency | 23.10 % | 22.40 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DM645M10T-B78HSW | DM695G12T-B66HSW | Difference | | --- | --- | --- | --- | | Module efficiency | 23.10 % | 22.40 % | +0.70 pp for DM645M10T-B78HSW | | Rated power | 645 Wp | 695 Wp | +50 W for DM695G12T-B66HSW | | Weight | 33.5 kg | 37.7 kg | -4.2 kg for DM645M10T-B78HSW | | Power density | 230.7 Wp/m² | 223.7 Wp/m² | +7.0 Wp/m² for DM645M10T-B78HSW | | Open-circuit voltage | 57.90 V | 48.22 V | 9.68 V apart | | Short-circuit current | 14.19 A | 18.38 A | 4.19 A apart | | Module area | 2.795 m² | 3.106 m² | 0.311 m² apart | | Voltage at max power | 48.05 V | 40.20 V | 7.85 V apart | | Current at max power | 13.44 A | 17.30 A | 3.86 A apart | | Cell count | 156 | 132 | 24 cells apart | | Weight per kWp | 51.9 kg/kWp | 54.2 kg/kWp | -2.3 kg/kWp for DM645M10T-B78HSW | | Dimensions | 2465x1134x30 mm | 2384x1303x33 mm | 2465x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | DM645M10T-B78HSW | DM695G12T-B66HSW | | --- | --- | --- | | Rated power | 645 Wp | 695 Wp | | Module efficiency | 23.10 % | 22.40 % | | Power density | 230.7 Wp/m² | 223.7 Wp/m² | | Open-circuit voltage | 57.90 V | 48.22 V | | Voltage at max power | 48.05 V | 40.20 V | | Short-circuit current | 14.19 A | 18.38 A | | Current at max power | 13.44 A | 17.30 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 | 51.9 kg/kWp | 54.2 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, DM645M10T-B78HSW:** 21,641 kWh - **Cumulative output, DM695G12T-B66HSW:** 23,319 kWh - **Gap:** 1,678 kWh ## Output when hot | Condition | Cell temperature | DM645M10T-B78HSW | DM695G12T-B66HSW | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 645 W | 695 W | 100.0% of rated power | | Cool, bright day | 40 °C | 617 W | 665 W | 95.7% of rated power | | Typical summer roof | 55 °C | 589 W | 635 W | 91.3% of rated power | | Hot roof | 70 °C | 561 W | 604 W | 87.0% of rated power | ## Against the whole database | Measure | DM645M10T-B78HSW | DM695G12T-B66HSW | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,570 | #4,774 | 14,005 | DM645M10T-B78HSW leads by 3,204 places | | Power density | #1,654 | #4,877 | 14,005 | DM645M10T-B78HSW leads by 3,223 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #5,361 | #8,493 | 14,005 | DM645M10T-B78HSW leads by 3,132 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,491 | #1,084 | 14,005 | DM695G12T-B66HSW leads by 407 places | ## Questions ### Which panel is better: DMEGC DM645M10T-B78HSW or DMEGC DM695G12T-B66HSW? According to our database: **DMEGC DM645M10T-B78HSW** has higher module efficiency (**23.10%** vs **22.40%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DMEGC DM645M10T-B78HSW and DMEGC DM695G12T-B66HSW? **DMEGC DM645M10T-B78HSW** has a module efficiency of **23.10%**, while **DMEGC DM695G12T-B66HSW** is **22.40%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DMEGC DM645M10T-B78HSW use vs DMEGC DM695G12T-B66HSW? **DMEGC DM645M10T-B78HSW** uses **TOPCon** cells; **DMEGC DM695G12T-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 DM645M10T-B78HSW and DMEGC DM695G12T-B66HSW? **DMEGC DM645M10T-B78HSW** has a **30 years** power warranty; **DMEGC DM695G12T-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 DM645M10T-B78HSW and DMEGC DM695G12T-B66HSW bifacial panels? Both **DMEGC DM645M10T-B78HSW** and **DMEGC DM695G12T-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 DM645M10T-B78HSW vs DMEGC DM650M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dm650m10t-b78hsw) - One difference: module efficiency - [DMEGC DM645M10T-B78HSW vs DMEGC DM640M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dm640m10t-b78hsw) - One difference: module efficiency - [DMEGC DM645M10T-B78HSW vs DMEGC DM635M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dm635m10t-b78hsw) - 3 differences, the largest is module efficiency - [DMEGC DM645M10T-B78HSW vs DMEGC DM630M10T-B78HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dm630m10t-b78hsw) - 3 differences, the largest is module efficiency - [DMEGC DM645M10T-B78HSW vs DMEGC DM600M10T-B72HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dmegc-magnetics-co-ltd-dm600m10t-b72hsw) - 7 differences, the largest is rated power - [DMEGC DM645M10T-B78HSW vs DMEGC DM595M10T-B72HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dmegc-magnetics-co-ltd-dm595m10t-b72hsw) - 7 differences, the largest is rated power --- Source: https://comparepv.com/compare/dmegc-hengdian-group-dm645m10t-b78hsw/dmegc-hengdian-group-dm695g12t-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.