--- title: "Sharp GSD8K66H-720WT vs Sharp NB-JD580 - Solar Panel Comparison | ComparePV" description: "Compare Sharp GSD8K66H-720WT vs Sharp NB-JD580 side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-nb-jd580" updated: 2026-09-11 --- # Sharp GSD8K66H-720WT vs Sharp NB-JD580 GSD8K66H-720WT leads on the differences that matter The largest is temperature coefficient: 0.040 %/°C better in heat. 6 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Sharp GSD8K66H-720WT](https://comparepv.com/panel/sharp-gsd8k66h-720wt) | [Sharp NB-JD580](https://comparepv.com/panel/sharp-nb-jd580) | | Manufacturer | Sharp | Sharp | | Power | 720 Wp | 580 Wp | | Efficiency | 23.18 % | 22.45 % | | Technology | HJT | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | GSD8K66H-720WT | NB-JD580 | Difference | | --- | --- | --- | --- | | Temperature coefficient | -0.260 %/°C | -0.300 %/°C | +0.040 %/°C for GSD8K66H-720WT | | Module efficiency | 23.18 % | 22.45 % | +0.73 pp for GSD8K66H-720WT | | Rated power | 720 Wp | 580 Wp | +140 W for GSD8K66H-720WT | | Weight | 39.0 kg | 32.5 kg | -6.5 kg for NB-JD580 | | Power density | 231.8 Wp/m² | 224.5 Wp/m² | +7.3 Wp/m² for GSD8K66H-720WT | | Short-circuit current | 17.60 A | 14.03 A | 3.57 A apart | | Module area | 3.106 m² | 2.583 m² | 0.523 m² apart | | Cell technology | HJT | TOPCon | HJT vs TOPCon | | Current at max power | 16.75 A | 13.43 A | 3.32 A apart | | Cell count | 132 | 144 | 12 cells apart | | Open-circuit voltage | 50.90 V | 52.55 V | 1.65 V apart | | Dimensions | 2384x1303x35 mm | 2278x1134x30 mm | 2384x1303x35 mm vs 2278x1134x30 mm | ## Every compared parameter | Parameter | GSD8K66H-720WT | NB-JD580 | | --- | --- | --- | | Rated power | 720 Wp | 580 Wp | | Module efficiency | 23.18 % | 22.45 % | | Power density | 231.8 Wp/m² | 224.5 Wp/m² | | Open-circuit voltage | 50.90 V | 52.55 V | | Voltage at max power | 43.00 V | 43.19 V | | Short-circuit current | 17.60 A | 14.03 A | | Current at max power | 16.75 A | 13.43 A | | Temperature coefficient | -0.260 %/°C | -0.300 %/°C | | Dimensions | 2384x1303x35 mm | 2278x1134x30 mm | | Module area | 3.106 m² | 2.583 m² | | Weight | 39.0 kg | 32.5 kg | | Weight per kWp | 54.2 kg/kWp | 56.0 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | - | | Cell technology | HJT | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 144 | | Bifacial | Yes | Yes | ## Thirty-year yield A 1.0% first-year loss then 0.40% a year, assumed for both panels, at 1,200 kWh/kWp a year - **Cumulative output, GSD8K66H-720WT:** 24,157 kWh - **Cumulative output, NB-JD580:** 19,460 kWh - **Gap:** 4,697 kWh ## Output when hot | Condition | Cell temperature | GSD8K66H-720WT | NB-JD580 | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 720 W | 580 W | 100.0% of rated power | | Cool, bright day | 40 °C | 692 W | 554 W | 95.5% of rated power | | Typical summer roof | 55 °C | 664 W | 528 W | 91.0% of rated power | | Hot roof | 70 °C | 636 W | 502 W | 86.5% of rated power | ## Against the whole database | Measure | GSD8K66H-720WT | NB-JD580 | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,424 | #4,620 | 14,005 | GSD8K66H-720WT leads by 3,196 places | | Power density | #1,347 | #4,547 | 14,005 | GSD8K66H-720WT leads by 3,200 places | | Heat behaviour | #511 | #6,093 | 14,005 | GSD8K66H-720WT leads by 5,582 places | | Weight | #8,370 | #10,343 | 14,005 | GSD8K66H-720WT leads by 1,973 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #82 | #2,056 | 14,005 | GSD8K66H-720WT leads by 1,974 places | ## Questions ### Which panel is better: Sharp GSD8K66H-720WT or Sharp NB-JD580? According to our database: **Sharp GSD8K66H-720WT** has higher module efficiency (**23.18%** vs **22.45%**); **Sharp GSD8K66H-720WT** tolerates heat better (temp coeff **-0.260%/°C** vs **-0.300%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Sharp GSD8K66H-720WT and Sharp NB-JD580? **Sharp GSD8K66H-720WT** has a module efficiency of **23.18%**, while **Sharp NB-JD580** is **22.45%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Sharp GSD8K66H-720WT use vs Sharp NB-JD580? **Sharp GSD8K66H-720WT** uses **HJT** cells; **Sharp NB-JD580** 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 Sharp GSD8K66H-720WT and Sharp NB-JD580? **Sharp GSD8K66H-720WT** has a **30 years** power warranty; **Sharp NB-JD580** 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 Sharp GSD8K66H-720WT and Sharp NB-JD580 bifacial panels? Both **Sharp GSD8K66H-720WT** and **Sharp NB-JD580** 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 - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-740WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-740wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-735WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-735wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-730WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-730wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-725WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-725wt) - The same specification on paper - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-715WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-715wt) - The same specification on paper - [Sharp GSD8K66H-720WT vs Sharp GSD8K66H-710WT](https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-gsd8k66h-710wt) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/sharp-gsd8k66h-720wt/sharp-nb-jd580 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.