--- title: "Renesola RS4-490NBG-E1 vs Renesola RS9-720NBG-E1 - Solar Panel Comparison | ComparePV" description: "Compare Renesola RS4-490NBG-E1 vs Renesola RS9-720NBG-E1 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs9-720nbg-e1" image: "https://comparepv.com/og/compare/panels/renesola-rs4-490nbg-e1/renesola-rs9-720nbg-e1.png" updated: 2026-09-11 --- # Renesola RS4-490NBG-E1 vs Renesola RS9-720NBG-E1 RS9-720NBG-E1 leads on the differences that matter The largest is rated power: 230 W more power. 7 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Renesola RS4-490NBG-E1](https://comparepv.com/panel/renesola-rs4-490nbg-e1) | [Renesola RS9-720NBG-E1](https://comparepv.com/panel/renesola-rs9-720nbg-e1) | | Manufacturer | Renesola | Renesola | | Power | 490 Wp | 720 Wp | | Efficiency | 22.71 % | 23.18 % | | Technology | N-type | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | RS4-490NBG-E1 | RS9-720NBG-E1 | Difference | | --- | --- | --- | --- | | Rated power | 490 Wp | 720 Wp | +230 W for RS9-720NBG-E1 | | Weight | 28.0 kg | 38.7 kg | -10.7 kg for RS4-490NBG-E1 | | Module efficiency | 22.71 % | 23.18 % | +0.47 pp for RS9-720NBG-E1 | | Open-circuit voltage | 44.78 V | 49.40 V | 4.62 V apart | | Short-circuit current | 13.85 A | 18.49 A | 4.64 A apart | | Module area | 2.158 m² | 3.106 m² | 0.948 m² apart | | Power density | 227.1 Wp/m² | 231.8 Wp/m² | +4.7 Wp/m² for RS9-720NBG-E1 | | Weight per kWp | 57.1 kg/kWp | 53.8 kg/kWp | -3.4 kg/kWp for RS9-720NBG-E1 | | Voltage at max power | 36.81 V | 41.30 V | 4.49 V apart | | Current at max power | 13.31 A | 17.44 A | 4.13 A apart | | Cell count | 120 | 132 | 12 cells apart | | Dimensions | 1903x1134x30 mm | 2384x1303x33 mm | 1903x1134x30 mm vs 2384x1303x33 mm | ## Every compared parameter | Parameter | RS4-490NBG-E1 | RS9-720NBG-E1 | | --- | --- | --- | | Rated power | 490 Wp | 720 Wp | | Module efficiency | 22.71 % | 23.18 % | | Power density | 227.1 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 44.78 V | 49.40 V | | Voltage at max power | 36.81 V | 41.30 V | | Short-circuit current | 13.85 A | 18.49 A | | Current at max power | 13.31 A | 17.44 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 1903x1134x30 mm | 2384x1303x33 mm | | Module area | 2.158 m² | 3.106 m² | | Weight | 28.0 kg | 38.7 kg | | Weight per kWp | 57.1 kg/kWp | 53.8 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 120 | 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, RS4-490NBG-E1:** 16,440 kWh - **Cumulative output, RS9-720NBG-E1:** 24,157 kWh - **Gap:** 7,717 kWh ## Output when hot | Condition | Cell temperature | RS4-490NBG-E1 | RS9-720NBG-E1 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 490 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 469 W | 689 W | 95.7% of rated power | | Typical summer roof | 55 °C | 447 W | 657 W | 91.3% of rated power | | Hot roof | 70 °C | 426 W | 626 W | 87.0% of rated power | ## Against the whole database | Measure | RS4-490NBG-E1 | RS9-720NBG-E1 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,342 | #1,468 | 14,129 | RS9-720NBG-E1 leads by 1,874 places | | Power density | #3,396 | #1,390 | 14,129 | RS9-720NBG-E1 leads by 2,006 places | | Heat behaviour | #2,220 | #2,220 | 14,129 | Tied - the same position in the database | | Weight | #11,169 | #7,881 | 14,129 | RS9-720NBG-E1 leads by 3,288 places | | Warranty | #21 | #21 | 14,129 | Tied - the same position in the database | | Overall | #6,871 | #366 | 14,129 | RS9-720NBG-E1 leads by 6,505 places | ## Questions ### Which panel is better: Renesola RS4-490NBG-E1 or Renesola RS9-720NBG-E1? According to our database: **Renesola RS9-720NBG-E1** has higher module efficiency (**23.18%** vs **22.71%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Renesola RS4-490NBG-E1 and Renesola RS9-720NBG-E1? **Renesola RS4-490NBG-E1** has a module efficiency of **22.71%**, while **Renesola RS9-720NBG-E1** is **23.18%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Renesola RS4-490NBG-E1 use vs Renesola RS9-720NBG-E1? **Renesola RS4-490NBG-E1** uses **N-type** cells; **Renesola RS9-720NBG-E1** uses **N-type**. 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 Renesola RS4-490NBG-E1 and Renesola RS9-720NBG-E1? **Renesola RS4-490NBG-E1** has a **30 years** power warranty; **Renesola RS9-720NBG-E1** 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 Renesola RS4-490NBG-E1 and Renesola RS9-720NBG-E1 bifacial panels? Both **Renesola RS4-490NBG-E1** and **Renesola RS9-720NBG-E1** 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 - [Renesola RS4-490NBG-E1 vs Renesola RS4-500NBG-E1](https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs4-500nbg-e1) - 3 differences, the largest is module efficiency - [Renesola RS4-490NBG-E1 vs Renesola RS4-495NBG-E1](https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs4-495nbg-e1) - One difference: module efficiency - [Renesola RS4-490NBG-E1 vs Renesola RS4-485NBG-E1](https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs4-485nbg-e1) - One difference: module efficiency - [Renesola RS4-490NBG-E1 vs Renesola RS4-480NBG-E1](https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs4-480nbg-e1) - 4 differences, the largest is module efficiency - [Renesola RS9-720NBG-E1 vs Renesola RS9-715NBG-E1](https://comparepv.com/compare/renesola-rs9-720nbg-e1/renesola-rs9-715nbg-e1) - The same specification on paper - [Renesola RS9-720NBG-E1 vs Renesola RS9-710NBG-E1](https://comparepv.com/compare/renesola-rs9-720nbg-e1/renesola-rs9-710nbg-e1) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/renesola-rs4-490nbg-e1/renesola-rs9-720nbg-e1 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.