--- title: "Suntech STP700S-D66-Nsh+ vs Suntech STP670S-D66/Pmh+ - Solar Panel Comparison | ComparePV" description: "Compare Suntech STP700S-D66-Nsh+ vs Suntech STP670S-D66/Pmh+ side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/suntech-stp700s-d66-nsh/wuxi-suntech-power-co-ltd-stp670s-d66-pmh" updated: 2026-09-11 --- # Suntech STP700S-D66-Nsh+ vs Suntech STP670S-D66/Pmh+ STP700S-D66-Nsh+ leads on the differences that matter The largest is module efficiency: 0.90 pp more efficient. 11 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Suntech STP700S-D66-Nsh+](https://comparepv.com/panel/suntech-stp700s-d66-nsh) | [Suntech STP670S-D66/Pmh+](https://comparepv.com/panel/wuxi-suntech-power-co-ltd-stp670s-d66-pmh) | | Manufacturer | Suntech | Suntech | | Power | 700 Wp | 670 Wp | | Efficiency | 22.50 % | 21.60 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | STP700S-D66-Nsh+ | STP670S-D66/Pmh+ | Difference | | --- | --- | --- | --- | | Module efficiency | 22.50 % | 21.60 % | +0.90 pp for STP700S-D66-Nsh+ | | Temperature coefficient | -0.290 %/°C | -0.340 %/°C | +0.050 %/°C for STP700S-D66-Nsh+ | | Power density | 225.3 Wp/m² | 215.7 Wp/m² | +9.7 Wp/m² for STP700S-D66-Nsh+ | | Rated power | 700 Wp | 670 Wp | +30 W for STP700S-D66-Nsh+ | | Annual degradation | 0.40 %/yr | 0.45 %/yr | -0.05 %/yr for STP700S-D66-Nsh+ | | Weight per kWp | 53.6 kg/kWp | 56.0 kg/kWp | -2.4 kg/kWp for STP700S-D66-Nsh+ | | Open-circuit voltage | 47.65 V | 46.45 V | 1.20 V apart | | Voltage at max power | 39.65 V | 38.45 V | 1.20 V apart | ## Every compared parameter | Parameter | STP700S-D66-Nsh+ | STP670S-D66/Pmh+ | | --- | --- | --- | | Rated power | 700 Wp | 670 Wp | | Module efficiency | 22.50 % | 21.60 % | | Power density | 225.3 Wp/m² | 215.7 Wp/m² | | Open-circuit voltage | 47.65 V | 46.45 V | | Voltage at max power | 39.65 V | 38.45 V | | Short-circuit current | 18.67 A | 18.43 A | | Current at max power | 17.66 A | 17.43 A | | Temperature coefficient | -0.290 %/°C | -0.340 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 37.5 kg | 37.5 kg | | Weight per kWp | 53.6 kg/kWp | 56.0 kg/kWp | | Product warranty | 15 yrs | 15 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.45 %/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 - **Cumulative output, STP700S-D66-Nsh+:** 23,486 kWh - **Cumulative output, STP670S-D66/Pmh+:** 22,064 kWh - **Gap:** 1,422 kWh ## Output when hot | Condition | Cell temperature | STP700S-D66-Nsh+ | STP670S-D66/Pmh+ | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 700 W | 670 W | 100.0% of rated power | | Cool, bright day | 40 °C | 670 W | 636 W | 94.9% of rated power | | Typical summer roof | 55 °C | 639 W | 602 W | 89.8% of rated power | | Hot roof | 70 °C | 609 W | 567 W | 84.7% of rated power | ## Against the whole database | Measure | STP700S-D66-Nsh+ | STP670S-D66/Pmh+ | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #4,222 | #7,652 | 14,005 | STP700S-D66-Nsh+ leads by 3,430 places | | Power density | #3,989 | #7,644 | 14,005 | STP700S-D66-Nsh+ leads by 3,655 places | | Heat behaviour | #2,165 | #8,778 | 14,005 | STP700S-D66-Nsh+ leads by 6,613 places | | Weight | #7,586 | #10,312 | 14,005 | STP700S-D66-Nsh+ leads by 2,726 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #936 | #1,986 | 14,005 | STP700S-D66-Nsh+ leads by 1,050 places | ## Questions ### Which panel is better: Suntech STP700S-D66-Nsh+ or Suntech STP670S-D66/Pmh+? According to our database: **Suntech STP700S-D66-Nsh+** has higher module efficiency (**22.50%** vs **21.60%**); **Suntech STP700S-D66-Nsh+** tolerates heat better (temp coeff **-0.290%/°C** vs **-0.340%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Suntech STP700S-D66-Nsh+ and Suntech STP670S-D66/Pmh+? **Suntech STP700S-D66-Nsh+** has a module efficiency of **22.50%**, while **Suntech STP670S-D66/Pmh+** is **21.60%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Suntech STP700S-D66-Nsh+ use vs Suntech STP670S-D66/Pmh+? **Suntech STP700S-D66-Nsh+** uses **TOPCon** cells; **Suntech STP670S-D66/Pmh+** 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 STP700S-D66-Nsh+ and Suntech STP670S-D66/Pmh+? **Suntech STP700S-D66-Nsh+** has a **30 years** power warranty; **Suntech STP670S-D66/Pmh+** 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 STP700S-D66-Nsh+ and Suntech STP670S-D66/Pmh+ bifacial panels? Both **Suntech STP700S-D66-Nsh+** and **Suntech STP670S-D66/Pmh+** 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 STP670S-D66/Pmh+ vs Suntech STP675S-D66/Wmh](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/suntech-stp675s-d66-wmh) - 6 differences, the largest is performance warranty - [Suntech STP670S-D66/Pmh+ vs Suntech STP670S-D66/Wmh](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/suntech-stp670s-d66-wmh) - 6 differences, the largest is performance warranty - [Suntech STP670S-D66/Pmh+ vs Suntech STP665S-D66/Wmh](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/suntech-stp665s-d66-wmh) - 7 differences, the largest is performance warranty - [Suntech STP670S-D66/Pmh+ vs Suntech STP665S-D66/Pmh+](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/wuxi-suntech-power-co-ltd-stp665s-d66-pmh) - One difference: module efficiency - [Suntech STP670S-D66/Pmh+ vs Suntech STP660S-D66/Wmh](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/suntech-stp660s-d66-wmh) - 9 differences, the largest is performance warranty - [Suntech STP670S-D66/Pmh+ vs Suntech STP660S-D66/Pmh+](https://comparepv.com/compare/wuxi-suntech-power-co-ltd-stp670s-d66-pmh/wuxi-suntech-power-co-ltd-stp660s-d66-pmh) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/suntech-stp700s-d66-nsh/wuxi-suntech-power-co-ltd-stp670s-d66-pmh 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.