--- title: "BYD NSBK-33-705 vs BYD NSBK-33-720 - Solar Panel Comparison | ComparePV" description: "Compare BYD NSBK-33-705 vs BYD NSBK-33-720 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-720" updated: 2026-09-11 --- # BYD NSBK-33-705 vs BYD NSBK-33-720 720 leads on the differences that matter The largest is module efficiency: 0.49 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [BYD NSBK-33-705](https://comparepv.com/panel/byd-nsbk-33-705) | [BYD NSBK-33-720](https://comparepv.com/panel/byd-nsbk-33-720) | | Manufacturer | BYD | BYD | | Power | 705 Wp | 720 Wp | | Efficiency | 22.70 % | 23.19 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | 705 | 720 | Difference | | --- | --- | --- | --- | | Module efficiency | 22.70 % | 23.19 % | +0.49 pp for 720 | | Power density | 227.0 Wp/m² | 231.8 Wp/m² | +4.8 Wp/m² for 720 | | Rated power | 705 Wp | 720 Wp | +15 W for 720 | ## Every compared parameter | Parameter | 705 | 720 | | --- | --- | --- | | Rated power | 705 Wp | 720 Wp | | Module efficiency | 22.70 % | 23.19 % | | Power density | 227.0 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 48.78 V | 49.44 V | | Voltage at max power | 40.94 V | 41.60 V | | Short-circuit current | 18.17 A | 18.26 A | | Current at max power | 17.22 A | 17.31 A | | Temperature coefficient | -0.278 %/°C | -0.278 %/°C | | Dimensions | 2384x1303x33 mm | 2384x1303x33 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.3 kg | 38.3 kg | | Weight per kWp | 54.3 kg/kWp | 53.2 kg/kWp | | Product warranty | 12 yrs | 12 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 | 132 | 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 (-0.278 %/°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, 705:** 23,654 kWh - **Cumulative output, 720:** 24,157 kWh - **Gap:** 503 kWh ## Output when hot | Condition | Cell temperature | 705 | 720 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 705 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 676 W | 690 W | 95.8% of rated power | | Typical summer roof | 55 °C | 646 W | 660 W | 91.7% of rated power | | Hot roof | 70 °C | 617 W | 630 W | 87.5% of rated power | ## Against the whole database | Measure | 705 | 720 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,307 | #1,423 | 14,005 | 720 leads by 1,884 places | | Power density | #3,361 | #1,347 | 14,005 | 720 leads by 2,014 places | | Heat behaviour | #1,295 | #1,295 | 14,005 | Tied - the same position in the database | | Weight | #8,604 | #7,025 | 14,005 | 720 leads by 1,579 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #1,007 | #540 | 14,005 | 720 leads by 467 places | ## Questions ### Which panel is better: BYD NSBK-33-705 or BYD NSBK-33-720? According to our database: **BYD NSBK-33-720** has higher module efficiency (**23.19%** vs **22.70%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of BYD NSBK-33-705 and BYD NSBK-33-720? **BYD NSBK-33-705** has a module efficiency of **22.70%**, while **BYD NSBK-33-720** is **23.19%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does BYD NSBK-33-705 use vs BYD NSBK-33-720? **BYD NSBK-33-705** uses **TOPCon** cells; **BYD NSBK-33-720** 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 BYD NSBK-33-705 and BYD NSBK-33-720? **BYD NSBK-33-705** has a **30 years** power warranty; **BYD NSBK-33-720** 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 BYD NSBK-33-705 and BYD NSBK-33-720 bifacial panels? Both **BYD NSBK-33-705** and **BYD NSBK-33-720** 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 - [BYD NSBK-33-705 vs BYD NSBK-33-715](https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-715) - 3 differences, the largest is module efficiency - [BYD NSBK-33-705 vs BYD NSBK-33-710](https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-710) - The same specification on paper - [BYD NSBK-33-705 vs BYD NSBK-33-700](https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-700) - The same specification on paper - [BYD NSBK-33-705 vs BYD NSBK-33-695](https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-695) - 3 differences, the largest is module efficiency - [BYD NSBK-33-705 vs BYD NSBK-33-690](https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-690) - 3 differences, the largest is module efficiency - [BYD NSBK-33-705 vs BYD HSBK-33-735](https://comparepv.com/compare/byd-nsbk-33-705/byd-hsbk-33-735) - 8 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/byd-nsbk-33-705/byd-nsbk-33-720 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.