--- title: "Resun Solar RS8V420M-FB vs Resun Solar RS9H-M TOPCON-735 - Solar Panel Comparison | ComparePV" description: "Compare Resun Solar RS8V420M-FB vs Resun Solar RS9H-M TOPCON-735 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-rs8v420m-fb/resun-solar-rs9h-m-topcon-735" updated: 2026-09-11 --- # Resun Solar RS8V420M-FB vs Resun Solar RS9H-M TOPCON-735 RS9H-M TOPCON-735 leads on the differences that matter The largest is module efficiency: 2.15 pp more efficient. 6 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Resun Solar RS8V420M-FB](https://comparepv.com/panel/resun-solar-rs8v420m-fb) | [Resun Solar RS9H-M TOPCON-735](https://comparepv.com/panel/resun-solar-rs9h-m-topcon-735) | | Manufacturer | Resun Solar | Resun Solar | | Power | 420 Wp | 735 Wp | | Efficiency | 21.51 % | 23.66 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | RS8V420M-FB | RS9H-M TOPCON-735 | Difference | | --- | --- | --- | --- | | Module efficiency | 21.51 % | 23.66 % | +2.15 pp for RS9H-M TOPCON-735 | | Temperature coefficient | -0.350 %/°C | -0.300 %/°C | +0.050 %/°C for RS9H-M TOPCON-735 | | Rated power | 420 Wp | 735 Wp | +315 W for RS9H-M TOPCON-735 | | Power density | 215.1 Wp/m² | 236.6 Wp/m² | +21.5 Wp/m² for RS9H-M TOPCON-735 | | Weight | 21.5 kg | 32.3 kg | -10.8 kg for RS8V420M-FB | | Weight per kWp | 51.2 kg/kWp | 43.9 kg/kWp | -7.2 kg/kWp for RS9H-M TOPCON-735 | | Open-circuit voltage | 37.58 V | 50.00 V | 12.42 V apart | | Short-circuit current | 14.11 A | 18.64 A | 4.53 A apart | | Module area | 1.953 m² | 3.106 m² | 1.154 m² apart | | Voltage at max power | 31.78 V | 41.90 V | 10.12 V apart | | Current at max power | 13.22 A | 17.55 A | 4.33 A apart | | Cell count | 108 | 132 | 24 cells apart | | Dimensions | 1722x1134x30 mm | 2384x1303x30 mm | 1722x1134x30 mm vs 2384x1303x30 mm | ## Every compared parameter | Parameter | RS8V420M-FB | RS9H-M TOPCON-735 | | --- | --- | --- | | Rated power | 420 Wp | 735 Wp | | Module efficiency | 21.51 % | 23.66 % | | Power density | 215.1 Wp/m² | 236.6 Wp/m² | | Open-circuit voltage | 37.58 V | 50.00 V | | Voltage at max power | 31.78 V | 41.90 V | | Short-circuit current | 14.11 A | 18.64 A | | Current at max power | 13.22 A | 17.55 A | | Temperature coefficient | -0.350 %/°C | -0.300 %/°C | | Dimensions | 1722x1134x30 mm | 2384x1303x30 mm | | Module area | 1.953 m² | 3.106 m² | | Weight | 21.5 kg | 32.3 kg | | Weight per kWp | 51.2 kg/kWp | 43.9 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 | 132 | | Bifacial | No | No | ## 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 - **Cumulative output, RS8V420M-FB:** 13,873 kWh - **Cumulative output, RS9H-M TOPCON-735:** 24,277 kWh - **Gap:** 10,404 kWh ## Output when hot | Condition | Cell temperature | RS8V420M-FB | RS9H-M TOPCON-735 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 420 W | 735 W | 100.0% of rated power | | Cool, bright day | 40 °C | 398 W | 702 W | 94.8% of rated power | | Typical summer roof | 55 °C | 376 W | 669 W | 89.5% of rated power | | Hot roof | 70 °C | 354 W | 636 W | 84.2% of rated power | ## Against the whole database | Measure | RS8V420M-FB | RS9H-M TOPCON-735 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #7,894 | #602 | 14,005 | RS9H-M TOPCON-735 leads by 7,292 places | | Power density | #7,882 | #582 | 14,005 | RS9H-M TOPCON-735 leads by 7,300 places | | Heat behaviour | #10,419 | #6,093 | 14,005 | RS9H-M TOPCON-735 leads by 4,326 places | | Weight | #4,567 | #364 | 14,005 | RS9H-M TOPCON-735 leads by 4,203 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #10,194 | #149 | 14,005 | RS9H-M TOPCON-735 leads by 10,045 places | ## Questions ### Which panel is better: Resun Solar RS8V420M-FB or Resun Solar RS9H-M TOPCON-735? According to our database: **Resun Solar RS9H-M TOPCON-735** has higher module efficiency (**23.66%** vs **21.51%**); **Resun Solar RS9H-M TOPCON-735** tolerates heat better (temp coeff **-0.300%/°C** vs **-0.350%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Resun Solar RS8V420M-FB and Resun Solar RS9H-M TOPCON-735? **Resun Solar RS8V420M-FB** has a module efficiency of **21.51%**, while **Resun Solar RS9H-M TOPCON-735** is **23.66%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Resun Solar RS8V420M-FB use vs Resun Solar RS9H-M TOPCON-735? **Resun Solar RS8V420M-FB** uses **TOPCon** cells; **Resun Solar RS9H-M TOPCON-735** 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 RS8V420M-FB and Resun Solar RS9H-M TOPCON-735? **Resun Solar RS8V420M-FB** has a **30 years** power warranty; **Resun Solar RS9H-M TOPCON-735** 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. ## Related comparisons - [Resun Solar RS8V420M-FB vs Resun Solar RS8V435M-FB](https://comparepv.com/compare/resun-solar-rs8v420m-fb/resun-solar-rs8v435m-fb) - 3 differences, the largest is module efficiency - [Resun Solar RS8V420M-FB vs Resun Solar RS8V430M-FB](https://comparepv.com/compare/resun-solar-rs8v420m-fb/resun-solar-rs8v430m-fb) - 3 differences, the largest is module efficiency - [Resun Solar RS8V420M-FB vs Resun Solar RS8V425M-FB](https://comparepv.com/compare/resun-solar-rs8v420m-fb/resun-solar-rs8v425m-fb) - One difference: module efficiency - [Resun Solar RS9H-M TOPCON-735 vs Resun Solar RS9H-M TOPCON-730](https://comparepv.com/compare/resun-solar-rs9h-m-topcon-735/resun-solar-rs9h-m-topcon-730) - The same specification on paper - [Resun Solar RS9H-M TOPCON-735 vs Resun Solar RS9H-M TOPCON-725](https://comparepv.com/compare/resun-solar-rs9h-m-topcon-735/resun-solar-rs9h-m-topcon-725) - 3 differences, the largest is module efficiency - [Resun Solar RS9H-M TOPCON-735 vs Resun Solar RS9H-M TOPCON-720](https://comparepv.com/compare/resun-solar-rs9h-m-topcon-735/resun-solar-rs9h-m-topcon-720) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/resun-solar-rs8v420m-fb/resun-solar-rs9h-m-topcon-735 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.