--- title: "Suntech STP720S-D66-Nsh+ vs Suntech STP625S-H66-Nsh+ - Solar Panel Comparison | ComparePV" description: "Compare Suntech STP720S-D66-Nsh+ vs Suntech STP625S-H66-Nsh+ side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/suntech-stp720s-d66-nsh/wuxi-suntech-power-co-ltd-stp625s-h66-nsh" updated: 2026-09-11 --- # Suntech STP720S-D66-Nsh+ vs Suntech STP625S-H66-Nsh+ 6 differences, and they point both ways The largest is rated power: 95 W more power. 13 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Suntech STP720S-D66-Nsh+](https://comparepv.com/panel/suntech-stp720s-d66-nsh) | [Suntech STP625S-H66-Nsh+](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp625s-h66-nsh) | | Manufacturer | Suntech | Suntech | | Power | 720 Wp | 625 Wp | | Efficiency | 23.20 % | 23.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | STP720S-D66-Nsh+ | STP625S-H66-Nsh+ | Difference | | --- | --- | --- | --- | | Rated power | 720 Wp | 625 Wp | +95 W for STP720S-D66-Nsh+ | | Weight | 37.5 kg | 33.1 kg | -4.4 kg for STP625S-H66-Nsh+ | | Short-circuit current | 18.46 A | 16.00 A | 2.46 A apart | | Module area | 3.106 m² | 2.701 m² | 0.405 m² apart | | Current at max power | 17.62 A | 15.21 A | 2.41 A apart | | Dimensions | 2384x1303x33 mm | 2382x1134x30 mm | 2384x1303x33 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | STP720S-D66-Nsh+ | STP625S-H66-Nsh+ | | --- | --- | --- | | Rated power | 720 Wp | 625 Wp | | Module efficiency | 23.20 % | 23.10 % | | Power density | 231.8 Wp/m² | 231.4 Wp/m² | | Open-circuit voltage | 49.26 V | 49.10 V | | Voltage at max power | 40.87 V | 41.10 V | | Short-circuit current | 18.46 A | 16.00 A | | Current at max power | 17.62 A | 15.21 A | | Temperature coefficient | -0.280 %/°C | -0.280 %/°C | | Dimensions | 2384x1303x33 mm | 2382x1134x30 mm | | Module area | 3.106 m² | 2.701 m² | | Weight | 37.5 kg | 33.1 kg | | Weight per kWp | 52.1 kg/kWp | 53.0 kg/kWp | | Product warranty | 15 yrs | 15 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 (-0.280 %/°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, STP720S-D66-Nsh+:** 24,157 kWh - **Cumulative output, STP625S-H66-Nsh+:** 20,970 kWh - **Gap:** 3,187 kWh ## Output when hot | Condition | Cell temperature | STP720S-D66-Nsh+ | STP625S-H66-Nsh+ | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 625 W | 100.0% of rated power | | Cool, bright day | 40 °C | 690 W | 599 W | 95.8% of rated power | | Typical summer roof | 55 °C | 660 W | 573 W | 91.6% of rated power | | Hot roof | 70 °C | 629 W | 546 W | 87.4% of rated power | ## Against the whole database | Measure | STP720S-D66-Nsh+ | STP625S-H66-Nsh+ | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,306 | #1,570 | 14,005 | STP720S-D66-Nsh+ leads by 264 places | | Power density | #1,347 | #1,513 | 14,005 | STP720S-D66-Nsh+ leads by 166 places | | Heat behaviour | #1,309 | #1,309 | 14,005 | Tied - the same position in the database | | Weight | #5,516 | #6,680 | 14,005 | STP720S-D66-Nsh+ leads by 1,164 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #330 | #1,879 | 14,005 | STP720S-D66-Nsh+ leads by 1,549 places | ## Questions ### Which panel is better: Suntech STP720S-D66-Nsh+ or Suntech STP625S-H66-Nsh+? According to our database: **Suntech STP720S-D66-Nsh+** has higher module efficiency (**23.20%** vs **23.10%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Suntech STP720S-D66-Nsh+ and Suntech STP625S-H66-Nsh+? **Suntech STP720S-D66-Nsh+** has a module efficiency of **23.20%**, while **Suntech STP625S-H66-Nsh+** is **23.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Suntech STP720S-D66-Nsh+ use vs Suntech STP625S-H66-Nsh+? **Suntech STP720S-D66-Nsh+** uses **TOPCon** cells; **Suntech STP625S-H66-Nsh+** 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 Suntech STP720S-D66-Nsh+ and Suntech STP625S-H66-Nsh+? **Suntech STP720S-D66-Nsh+** has a **30 years** power warranty; **Suntech STP625S-H66-Nsh+** 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 Suntech STP720S-D66-Nsh+ and Suntech STP625S-H66-Nsh+ bifacial panels? Both **Suntech STP720S-D66-Nsh+** and **Suntech STP625S-H66-Nsh+** 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 - [Suntech STP720S-D66-Nsh+ vs Suntech STP735S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp735s-d66-nsh) - 3 differences, the largest is module efficiency - [Suntech STP720S-D66-Nsh+ vs Suntech STP730S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp730s-d66-nsh) - 3 differences, the largest is module efficiency - [Suntech STP720S-D66-Nsh+ vs Suntech STP725S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp725s-d66-nsh) - The same specification on paper - [Suntech STP720S-D66-Nsh+ vs Suntech STP715S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp715s-d66-nsh) - One difference: module efficiency - [Suntech STP720S-D66-Nsh+ vs Suntech STP710S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp710s-d66-nsh) - 7 differences, the largest is product warranty - [Suntech STP720S-D66-Nsh+ vs Suntech STP705S-D66-Nsh+](https://comparepv.com/compare/suntech-stp720s-d66-nsh/suntech-stp705s-d66-nsh) - 7 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/suntech-stp720s-d66-nsh/wuxi-suntech-power-co-ltd-stp625s-h66-nsh 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.