--- title: "Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-425 - Solar Panel Comparison | ComparePV" description: "Compare Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-425 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-425" updated: 2026-09-11 --- # Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-425 RS8V-M-DG leads on the differences that matter The largest is module efficiency: 0.77 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Resun Solar RS8V-M-DG](https://comparepv.com/panel/resun-solar-rs8v-m-dg) | [Resun Solar RS8V-M-DG-425](https://comparepv.com/panel/resun-solar-rs8v-m-dg-425) | | Manufacturer | Resun Solar | Resun Solar | | Power | 440 Wp | 425 Wp | | Efficiency | 22.53 % | 21.76 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | RS8V-M-DG | RS8V-M-DG-425 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.53 % | 21.76 % | +0.77 pp for RS8V-M-DG | | Power density | 225.3 Wp/m² | 217.6 Wp/m² | +7.7 Wp/m² for RS8V-M-DG | | Rated power | 440 Wp | 425 Wp | +15 W for RS8V-M-DG | ## Every compared parameter | Parameter | RS8V-M-DG | RS8V-M-DG-425 | | --- | --- | --- | | Rated power | 440 Wp | 425 Wp | | Module efficiency | 22.53 % | 21.76 % | | Power density | 225.3 Wp/m² | 217.6 Wp/m² | | Open-circuit voltage | 38.10 V | 38.45 V | | Voltage at max power | 32.41 V | 31.99 V | | Short-circuit current | 14.43 A | 14.09 A | | Current at max power | 13.58 A | 13.29 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 1722x1134x30 mm | 1722x1134x30 mm | | Module area | 1.953 m² | 1.953 m² | | Weight | 23.8 kg | 23.8 kg | | Weight per kWp | 54.1 kg/kWp | 56.0 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.50 %/yr | 0.50 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 108 | 108 | | Bifacial | Yes | Yes | ## Thirty-year yield Declared annual degradation, with a 1.0% first-year loss assumed for both panels because at least one datasheet omits it, at 1,200 kWh/kWp a year Same temp coeff. for both panels (-0.300 %/°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, RS8V-M-DG:** 14,533 kWh - **Cumulative output, RS8V-M-DG-425:** 14,038 kWh - **Gap:** 495 kWh ## Output when hot | Condition | Cell temperature | RS8V-M-DG | RS8V-M-DG-425 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 440 W | 425 W | 100.0% of rated power | | Cool, bright day | 40 °C | 420 W | 406 W | 95.5% of rated power | | Typical summer roof | 55 °C | 400 W | 387 W | 91.0% of rated power | | Hot roof | 70 °C | 381 W | 368 W | 86.5% of rated power | ## Against the whole database | Measure | RS8V-M-DG | RS8V-M-DG-425 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,982 | #7,285 | 14,005 | RS8V-M-DG leads by 3,303 places | | Power density | #4,099 | #7,172 | 14,005 | RS8V-M-DG leads by 3,073 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #8,316 | #10,317 | 14,005 | RS8V-M-DG leads by 2,001 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #8,801 | #9,980 | 14,005 | RS8V-M-DG leads by 1,179 places | ## Questions ### Which panel is better: Resun Solar RS8V-M-DG or Resun Solar RS8V-M-DG-425? According to our database: **Resun Solar RS8V-M-DG** has higher module efficiency (**22.53%** vs **21.76%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Resun Solar RS8V-M-DG and Resun Solar RS8V-M-DG-425? **Resun Solar RS8V-M-DG** has a module efficiency of **22.53%**, while **Resun Solar RS8V-M-DG-425** is **21.76%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Resun Solar RS8V-M-DG use vs Resun Solar RS8V-M-DG-425? **Resun Solar RS8V-M-DG** uses **TOPCon** cells; **Resun Solar RS8V-M-DG-425** 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 Resun Solar RS8V-M-DG and Resun Solar RS8V-M-DG-425? **Resun Solar RS8V-M-DG** has a **30 years** power warranty; **Resun Solar RS8V-M-DG-425** 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 Resun Solar RS8V-M-DG and Resun Solar RS8V-M-DG-425 bifacial panels? Both **Resun Solar RS8V-M-DG** and **Resun Solar RS8V-M-DG-425** 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 - [Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-440](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-440) - The same specification on paper - [Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-435](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-435) - One difference: module efficiency - [Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-430](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-430) - 3 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-420](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-420) - 4 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG vs Resun Solar RS8V-M-DG-415](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-415) - 5 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG vs Resun Solar RS9H-M TOPCON-735](https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs9h-m-topcon-735) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/resun-solar-rs8v-m-dg/resun-solar-rs8v-m-dg-425 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.