--- title: "Sharp GSD8K66H-715WT vs Sharp GSD8K66H-720WT - Solar Panel Comparison | ComparePV" description: "Compare Sharp GSD8K66H-715WT vs Sharp GSD8K66H-720WT 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-715wt/sharp-gsd8k66h-720wt" updated: 2026-09-11 --- # Sharp GSD8K66H-715WT vs Sharp GSD8K66H-720WT Identical on every published parameter All 19 comparable parameters agree. Two records this alike are usually one panel sold under two names, or two bins of the same production line - decide on price and on who you would rather buy from. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Sharp GSD8K66H-715WT](https://comparepv.com/panel/sharp-gsd8k66h-715wt) | [Sharp GSD8K66H-720WT](https://comparepv.com/panel/sharp-gsd8k66h-720wt) | | Manufacturer | Sharp | Sharp | | Power | 715 Wp | 720 Wp | | Efficiency | 23.02 % | 23.18 % | | Technology | HJT | HJT | ## Every compared parameter | Parameter | 715WT | 720WT | | --- | --- | --- | | Rated power | 715 Wp | 720 Wp | | Module efficiency | 23.02 % | 23.18 % | | Power density | 230.2 Wp/m² | 231.8 Wp/m² | | Open-circuit voltage | 50.70 V | 50.90 V | | Voltage at max power | 42.80 V | 43.00 V | | Short-circuit current | 17.56 A | 17.60 A | | Current at max power | 16.71 A | 16.75 A | | Temperature coefficient | -0.260 %/°C | -0.260 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 39.0 kg | 39.0 kg | | Weight per kWp | 54.5 kg/kWp | 54.2 kg/kWp | | Product warranty | 25 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | 0.35 %/yr | | Cell technology | HJT | HJT | | 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 (-0.260 %/°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, 715WT:** 24,176 kWh - **Cumulative output, 720WT:** 24,345 kWh - **Gap:** 169 kWh ## Output when hot | Condition | Cell temperature | 715WT | 720WT | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 715 W | 720 W | 100.0% of rated power | | Cool, bright day | 40 °C | 687 W | 692 W | 96.1% of rated power | | Typical summer roof | 55 °C | 659 W | 664 W | 92.2% of rated power | | Hot roof | 70 °C | 631 W | 636 W | 88.3% of rated power | ## Against the whole database | Measure | 715WT | 720WT | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,797 | #1,424 | 14,005 | 720WT leads by 373 places | | Power density | #2,018 | #1,347 | 14,005 | 720WT leads by 671 places | | Heat behaviour | #511 | #511 | 14,005 | Tied - the same position in the database | | Weight | #8,872 | #8,370 | 14,005 | 720WT leads by 502 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #112 | #82 | 14,005 | 720WT leads by 30 places | ## Questions ### Which panel is better: Sharp GSD8K66H-715WT or Sharp GSD8K66H-720WT? According to our database: **Sharp GSD8K66H-720WT** has higher module efficiency (**23.18%** vs **23.02%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Sharp GSD8K66H-715WT and Sharp GSD8K66H-720WT? **Sharp GSD8K66H-715WT** has a module efficiency of **23.02%**, while **Sharp GSD8K66H-720WT** is **23.18%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Sharp GSD8K66H-715WT use vs Sharp GSD8K66H-720WT? **Sharp GSD8K66H-715WT** uses **HJT** cells; **Sharp GSD8K66H-720WT** uses **HJT**. 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-715WT and Sharp GSD8K66H-720WT? **Sharp GSD8K66H-715WT** has a **30 years** power warranty; **Sharp GSD8K66H-720WT** 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-715WT and Sharp GSD8K66H-720WT bifacial panels? Both **Sharp GSD8K66H-715WT** and **Sharp GSD8K66H-720WT** 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-715WT vs Sharp GSD8K66H-740WT](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-740wt) - 5 differences, the largest is module efficiency - [Sharp GSD8K66H-715WT vs Sharp GSD8K66H-735WT](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-735wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-715WT vs Sharp GSD8K66H-730WT](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-730wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-715WT vs Sharp GSD8K66H-725WT](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-725wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-715WT vs Sharp GSD8K66H-710WT](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-710wt) - The same specification on paper - [Sharp GSD8K66H-715WT vs Sharp NB-JD580](https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-nb-jd580) - 12 differences, the largest is temperature coefficient --- Source: https://comparepv.com/compare/sharp-gsd8k66h-715wt/sharp-gsd8k66h-720wt 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.