--- title: "Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-440 - Solar Panel Comparison | ComparePV" description: "Compare Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-440 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-420/resun-solar-rs8v-m-dg-440" updated: 2026-09-11 --- # Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-440 440 leads on the differences that matter The largest is module efficiency: 1.02 pp more efficient. 15 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Resun Solar RS8V-M-DG-420](https://comparepv.com/panel/resun-solar-rs8v-m-dg-420) | [Resun Solar RS8V-M-DG-440](https://comparepv.com/panel/resun-solar-rs8v-m-dg-440) | | Manufacturer | Resun Solar | Resun Solar | | Power | 420 Wp | 440 Wp | | Efficiency | 21.51 % | 22.53 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 420 | 440 | Difference | | --- | --- | --- | --- | | Module efficiency | 21.51 % | 22.53 % | +1.02 pp for 440 | | Power density | 215.1 Wp/m² | 225.3 Wp/m² | +10.2 Wp/m² for 440 | | Rated power | 420 Wp | 440 Wp | +20 W for 440 | | Weight per kWp | 56.7 kg/kWp | 54.1 kg/kWp | -2.6 kg/kWp for 440 | ## Every compared parameter | Parameter | 420 | 440 | | --- | --- | --- | | Rated power | 420 Wp | 440 Wp | | Module efficiency | 21.51 % | 22.53 % | | Power density | 215.1 Wp/m² | 225.3 Wp/m² | | Open-circuit voltage | 38.30 V | 38.90 V | | Voltage at max power | 31.85 V | 32.45 V | | Short-circuit current | 14.00 A | 14.36 A | | Current at max power | 13.19 A | 13.56 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 | 56.7 kg/kWp | 54.1 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, 420:** 13,873 kWh - **Cumulative output, 440:** 14,533 kWh - **Gap:** 660 kWh ## Output when hot | Condition | Cell temperature | 420 | 440 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 420 W | 440 W | 100.0% of rated power | | Cool, bright day | 40 °C | 401 W | 420 W | 95.5% of rated power | | Typical summer roof | 55 °C | 382 W | 400 W | 91.0% of rated power | | Hot roof | 70 °C | 363 W | 381 W | 86.5% of rated power | ## Against the whole database | Measure | 420 | 440 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,894 | #3,982 | 14,005 | 440 leads by 3,912 places | | Power density | #7,882 | #4,099 | 14,005 | 440 leads by 3,783 places | | Heat behaviour | #6,093 | #6,093 | 14,005 | Tied - the same position in the database | | Weight | #10,801 | #8,316 | 14,005 | 440 leads by 2,485 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #10,246 | #8,801 | 14,005 | 440 leads by 1,445 places | ## Questions ### Which panel is better: Resun Solar RS8V-M-DG-420 or Resun Solar RS8V-M-DG-440? According to our database: **Resun Solar RS8V-M-DG-440** has higher module efficiency (**22.53%** vs **21.51%**). 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-420 and Resun Solar RS8V-M-DG-440? **Resun Solar RS8V-M-DG-420** has a module efficiency of **21.51%**, while **Resun Solar RS8V-M-DG-440** is **22.53%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Resun Solar RS8V-M-DG-420 use vs Resun Solar RS8V-M-DG-440? **Resun Solar RS8V-M-DG-420** uses **TOPCon** cells; **Resun Solar RS8V-M-DG-440** 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-420 and Resun Solar RS8V-M-DG-440? **Resun Solar RS8V-M-DG-420** has a **30 years** power warranty; **Resun Solar RS8V-M-DG-440** 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-420 and Resun Solar RS8V-M-DG-440 bifacial panels? Both **Resun Solar RS8V-M-DG-420** and **Resun Solar RS8V-M-DG-440** 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-420 vs Resun Solar RS8V-M-DG](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg) - 4 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-435](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg-435) - 3 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-430](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg-430) - 3 differences, the largest is module efficiency - [Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-425](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg-425) - One difference: module efficiency - [Resun Solar RS8V-M-DG-420 vs Resun Solar RS8V-M-DG-415](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg-415) - One difference: module efficiency - [Resun Solar RS8V-M-DG-420 vs Resun Solar RS9H-M TOPCON-735](https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs9h-m-topcon-735) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/resun-solar-rs8v-m-dg-420/resun-solar-rs8v-m-dg-440 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.