--- title: "DMEGC DM705G12T-B66HSW vs DMEGC DM630G12RT-B66HSW - Solar Panel Comparison | ComparePV" description: "Compare DMEGC DM705G12T-B66HSW vs DMEGC DM630G12RT-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-dm705g12t-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm630g12rt-b66hsw" updated: 2026-09-11 --- # DMEGC DM705G12T-B66HSW vs DMEGC DM630G12RT-B66HSW DM630G12RT-B66HSW leads on the differences that matter The largest is rated power: 75 W more power. 10 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [DMEGC DM705G12T-B66HSW](https://comparepv.com/panel/dmegc-hengdian-group-dm705g12t-b66hsw) | [DMEGC DM630G12RT-B66HSW](https://comparepv.com/panel/hengdian-group-dmegc-magnetics-co-ltd-dm630g12rt-b66hsw) | | Manufacturer | DMEGC | DMEGC | | Power | 705 Wp | 630 Wp | | Efficiency | 22.70 % | 23.30 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | DM705G12T-B66HSW | DM630G12RT-B66HSW | Difference | | --- | --- | --- | --- | | Rated power | 705 Wp | 630 Wp | +75 W for DM705G12T-B66HSW | | Module efficiency | 22.70 % | 23.30 % | +0.60 pp for DM630G12RT-B66HSW | | Weight | 37.7 kg | 32.3 kg | -5.4 kg for DM630G12RT-B66HSW | | Power density | 227.0 Wp/m² | 233.2 Wp/m² | +6.3 Wp/m² for DM630G12RT-B66HSW | | Short-circuit current | 18.48 A | 16.23 A | 2.25 A apart | | Module area | 3.106 m² | 2.701 m² | 0.405 m² apart | | Current at max power | 17.40 A | 15.30 A | 2.10 A apart | | Weight per kWp | 53.5 kg/kWp | 51.3 kg/kWp | -2.2 kg/kWp for DM630G12RT-B66HSW | | Dimensions | 2384x1303x33 mm | 2382x1134x30 mm | 2384x1303x33 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | DM705G12T-B66HSW | DM630G12RT-B66HSW | | --- | --- | --- | | Rated power | 705 Wp | 630 Wp | | Module efficiency | 22.70 % | 23.30 % | | Power density | 227.0 Wp/m² | 233.2 Wp/m² | | Open-circuit voltage | 48.62 V | 49.49 V | | Voltage at max power | 40.58 V | 41.25 V | | Short-circuit current | 18.48 A | 16.23 A | | Current at max power | 17.40 A | 15.30 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2384x1303x33 mm | 2382x1134x30 mm | | Module area | 3.106 m² | 2.701 m² | | Weight | 37.7 kg | 32.3 kg | | Weight per kWp | 53.5 kg/kWp | 51.3 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, DM705G12T-B66HSW:** 23,654 kWh - **Cumulative output, DM630G12RT-B66HSW:** 21,138 kWh - **Gap:** 2,516 kWh ## Output when hot | Condition | Cell temperature | DM705G12T-B66HSW | DM630G12RT-B66HSW | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 705 W | 630 W | 100.0% of rated power | | Cool, bright day | 40 °C | 674 W | 603 W | 95.7% of rated power | | Typical summer roof | 55 °C | 644 W | 575 W | 91.3% of rated power | | Hot roof | 70 °C | 613 W | 548 W | 87.0% of rated power | ## Against the whole database | Measure | DM705G12T-B66HSW | DM630G12RT-B66HSW | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,017 | 14,005 | DM630G12RT-B66HSW leads by 2,290 places | | Power density | #3,361 | #1,003 | 14,005 | DM630G12RT-B66HSW leads by 2,358 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #7,434 | #4,663 | 14,005 | DM630G12RT-B66HSW leads by 2,771 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #747 | #1,623 | 14,005 | DM705G12T-B66HSW leads by 876 places | ## Questions ### Which panel is better: DMEGC DM705G12T-B66HSW or DMEGC DM630G12RT-B66HSW? According to our database: **DMEGC DM630G12RT-B66HSW** has higher module efficiency (**23.30%** vs **22.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of DMEGC DM705G12T-B66HSW and DMEGC DM630G12RT-B66HSW? **DMEGC DM705G12T-B66HSW** has a module efficiency of **22.70%**, while **DMEGC DM630G12RT-B66HSW** is **23.30%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does DMEGC DM705G12T-B66HSW use vs DMEGC DM630G12RT-B66HSW? **DMEGC DM705G12T-B66HSW** uses **TOPCon** cells; **DMEGC DM630G12RT-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 DM705G12T-B66HSW and DMEGC DM630G12RT-B66HSW? **DMEGC DM705G12T-B66HSW** has a **30 years** power warranty; **DMEGC DM630G12RT-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 DM705G12T-B66HSW and DMEGC DM630G12RT-B66HSW bifacial panels? Both **DMEGC DM705G12T-B66HSW** and **DMEGC DM630G12RT-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 DM705G12T-B66HSW vs DMEGC DM720G12T-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/dmegc-hengdian-group-dm720g12t-b66hsw) - 3 differences, the largest is module efficiency - [DMEGC DM705G12T-B66HSW vs DMEGC DM715G12T-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/dmegc-hengdian-group-dm715g12t-b66hsw) - 3 differences, the largest is module efficiency - [DMEGC DM705G12T-B66HSW vs DMEGC DM710G12T-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/dmegc-hengdian-group-dm710g12t-b66hsw) - One difference: module efficiency - [DMEGC DM705G12T-B66HSW vs DMEGC DM700G12T-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/dmegc-hengdian-group-dm700g12t-b66hsw) - One difference: module efficiency - [DMEGC DM705G12T-B66HSW vs DMEGC DM695G12T-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/dmegc-hengdian-group-dm695g12t-b66hsw) - 3 differences, the largest is module efficiency - [DMEGC DM705G12T-B66HSW vs DMEGC DM635G12RT-B66HSW](https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm635g12rt-b66hsw) - 10 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/dmegc-hengdian-group-dm705g12t-b66hsw/hengdian-group-dmegc-magnetics-co-ltd-dm630g12rt-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.