--- title: "VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN425N-108BMH-DG-BB - Solar Panel Comparison | ComparePV" description: "Compare VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN425N-108BMH-DG-BB side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun425n-108bmh-dg-bb" image: "https://comparepv.com/og/compare/panels/vsun-vsun420n-108bmh-dg-bb/vsun-vsun425n-108bmh-dg-bb.png" updated: 2026-09-11 --- # VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN425N-108BMH-DG-BB VSUN425N-108BMH-DG-BB leads on the differences that matter The largest is module efficiency: 0.25 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [VSUN VSUN420N-108BMH-DG-BB](https://comparepv.com/panel/vsun-vsun420n-108bmh-dg-bb) | [VSUN VSUN425N-108BMH-DG-BB](https://comparepv.com/panel/vsun-vsun425n-108bmh-dg-bb) | | Manufacturer | VSUN | VSUN | | Power | 420 Wp | 425 Wp | | Efficiency | 21.51 % | 21.76 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | VSUN420N-108BMH-DG-BB | VSUN425N-108BMH-DG-BB | Difference | | --- | --- | --- | --- | | Module efficiency | 21.51 % | 21.76 % | +0.25 pp for VSUN425N-108BMH-DG-BB | ## Every compared parameter | Parameter | VSUN420N-108BMH-DG-BB | VSUN425N-108BMH-DG-BB | | --- | --- | --- | | Rated power | 420 Wp | 425 Wp | | Module efficiency | 21.51 % | 21.76 % | | Power density | 215.1 Wp/m² | 217.6 Wp/m² | | Open-circuit voltage | 38.11 V | 38.40 V | | Voltage at max power | 31.52 V | 31.72 V | | Short-circuit current | 14.07 A | 14.16 A | | Current at max power | 13.32 A | 13.40 A | | Temperature coefficient | -0.300 %/°C | -0.300 %/°C | | Dimensions | 1722x1134x30 mm | 1722x1134x30 mm | | Module area | 1.953 m² | 1.953 m² | | Weight | 24.7 kg | 24.7 kg | | Weight per kWp | 58.8 kg/kWp | 58.1 kg/kWp | | Product warranty | 25 yrs | 25 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 | 108 | 108 | | 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 (-0.300 %/°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, VSUN420N-108BMH-DG-BB:** 14,092 kWh - **Cumulative output, VSUN425N-108BMH-DG-BB:** 14,260 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | VSUN420N-108BMH-DG-BB | VSUN425N-108BMH-DG-BB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 420 W | 425 W | 100.0% of rated power | | Cool, bright day | 40 °C | 401 W | 406 W | 95.5% of rated power | | Typical summer roof | 55 °C | 382 W | 387 W | 91.0% of rated power | | Hot roof | 70 °C | 363 W | 368 W | 86.5% of rated power | ## Against the whole database | Measure | VSUN420N-108BMH-DG-BB | VSUN425N-108BMH-DG-BB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,958 | #7,349 | 14,129 | VSUN425N-108BMH-DG-BB leads by 609 places | | Power density | #7,946 | #7,235 | 14,129 | VSUN425N-108BMH-DG-BB leads by 711 places | | Heat behaviour | #6,152 | #6,152 | 14,129 | Tied - the same position in the database | | Weight | #11,997 | #11,654 | 14,129 | VSUN425N-108BMH-DG-BB leads by 343 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #8,723 | #8,246 | 14,129 | VSUN425N-108BMH-DG-BB leads by 477 places | ## Questions ### Which panel is better: VSUN VSUN420N-108BMH-DG-BB or VSUN VSUN425N-108BMH-DG-BB? According to our database: **VSUN VSUN425N-108BMH-DG-BB** has higher module efficiency (**21.76%** vs **21.51%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of VSUN VSUN420N-108BMH-DG-BB and VSUN VSUN425N-108BMH-DG-BB? **VSUN VSUN420N-108BMH-DG-BB** has a module efficiency of **21.51%**, while **VSUN VSUN425N-108BMH-DG-BB** is **21.76%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does VSUN VSUN420N-108BMH-DG-BB use vs VSUN VSUN425N-108BMH-DG-BB? **VSUN VSUN420N-108BMH-DG-BB** uses **TOPCon** cells; **VSUN VSUN425N-108BMH-DG-BB** 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 VSUN VSUN420N-108BMH-DG-BB and VSUN VSUN425N-108BMH-DG-BB? **VSUN VSUN420N-108BMH-DG-BB** has a **30 years** power warranty; **VSUN VSUN425N-108BMH-DG-BB** 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 VSUN VSUN420N-108BMH-DG-BB and VSUN VSUN425N-108BMH-DG-BB bifacial panels? Both **VSUN VSUN420N-108BMH-DG-BB** and **VSUN VSUN425N-108BMH-DG-BB** 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 - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN430N-108BMH-DG-BB](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun430n-108bmh-dg-bb) - 3 differences, the largest is module efficiency - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN415N-108BMH-DG-BB](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun415n-108bmh-dg-bb) - One difference: module efficiency - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN715N-132BMHT-DG](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun715n-132bmht-dg) - 13 differences, the largest is module efficiency - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN710N-132BMHT-DG](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun710n-132bmht-dg) - 13 differences, the largest is module efficiency - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN705N-132BMHT-DG](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun705n-132bmht-dg) - 13 differences, the largest is module efficiency - [VSUN VSUN420N-108BMH-DG-BB vs VSUN VSUN700N-132BMH-DG](https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun700n-132bmh-dg) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/vsun-vsun420n-108bmh-dg-bb/vsun-vsun425n-108bmh-dg-bb 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.