--- title: "MY Solar MS730N-HJTGB vs Sharp GSD8K66H-740WT - Solar Panel Comparison | ComparePV" description: "Compare MY Solar MS730N-HJTGB vs Sharp GSD8K66H-740WT side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/my-solar-ms730n-hjtgb/sharp-gsd8k66h-740wt" updated: 2026-09-11 --- # MY Solar MS730N-HJTGB vs Sharp GSD8K66H-740WT 5 differences, and they point both ways The largest is product warranty: 5 yrs longer. 13 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 | [MY Solar MS730N-HJTGB](https://comparepv.com/panel/my-solar-ms730n-hjtgb) | [Sharp GSD8K66H-740WT](https://comparepv.com/panel/sharp-gsd8k66h-740wt) | | Manufacturer | MY Solar | Sharp | | Power | 730 Wp | 740 Wp | | Efficiency | 23.50 % | 23.82 % | | Technology | HJT | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | MS730N-HJTGB | GSD8K66H-740WT | Difference | | --- | --- | --- | --- | | Product warranty | 30 yrs | 25 yrs | +5 yrs for MS730N-HJTGB | | Temperature coefficient | -0.240 %/°C | -0.260 %/°C | +0.020 %/°C for MS730N-HJTGB | | Module efficiency | 23.50 % | 23.82 % | +0.32 pp for GSD8K66H-740WT | | Power density | 235.0 Wp/m² | 238.2 Wp/m² | +3.2 Wp/m² for GSD8K66H-740WT | | Rated power | 730 Wp | 740 Wp | +10 W for GSD8K66H-740WT | ## Every compared parameter | Parameter | MS730N-HJTGB | GSD8K66H-740WT | | --- | --- | --- | | Rated power | 730 Wp | 740 Wp | | Module efficiency | 23.50 % | 23.82 % | | Power density | 235.0 Wp/m² | 238.2 Wp/m² | | Open-circuit voltage | 51.05 V | 51.70 V | | Voltage at max power | 42.97 V | 43.80 V | | Short-circuit current | 17.81 A | 17.76 A | | Current at max power | 16.99 A | 16.91 A | | Temperature coefficient | -0.240 %/°C | -0.260 %/°C | | Dimensions | 2384x1303x35 mm | 2384x1303x35 mm | | Module area | 3.106 m² | 3.106 m² | | Weight | 38.3 kg | 39.0 kg | | Weight per kWp | 52.5 kg/kWp | 52.7 kg/kWp | | Product warranty | 30 yrs | 25 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | - | 0.35 %/yr | | Cell technology | HJT | HJT | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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, MS730N-HJTGB:** 24,493 kWh - **Cumulative output, GSD8K66H-740WT:** 24,828 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | MS730N-HJTGB | GSD8K66H-740WT | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 730 W | 740 W | 100.0% of rated power | | Cool, bright day | 40 °C | 704 W | 711 W | 96.1% of rated power | | Typical summer roof | 55 °C | 677 W | 682 W | 92.2% of rated power | | Hot roof | 70 °C | 651 W | 653 W | 88.3% of rated power | ## Against the whole database | Measure | MS730N-HJTGB | GSD8K66H-740WT | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #716 | #418 | 14,005 | GSD8K66H-740WT leads by 298 places | | Power density | #800 | #431 | 14,005 | GSD8K66H-740WT leads by 369 places | | Heat behaviour | #13 | #511 | 14,005 | MS730N-HJTGB leads by 498 places | | Weight | #5,993 | #6,344 | 14,005 | MS730N-HJTGB leads by 351 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #8 | #12 | 14,005 | MS730N-HJTGB leads by 4 places | ## Questions ### Which panel is better: MY Solar MS730N-HJTGB or Sharp GSD8K66H-740WT? According to our database: **Sharp GSD8K66H-740WT** has higher module efficiency (**23.82%** vs **23.50%**); **MY Solar MS730N-HJTGB** tolerates heat better (temp coeff **-0.240%/°C** vs **-0.260%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of MY Solar MS730N-HJTGB and Sharp GSD8K66H-740WT? **MY Solar MS730N-HJTGB** has a module efficiency of **23.50%**, while **Sharp GSD8K66H-740WT** is **23.82%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does MY Solar MS730N-HJTGB use vs Sharp GSD8K66H-740WT? **MY Solar MS730N-HJTGB** uses **HJT** cells; **Sharp GSD8K66H-740WT** 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 MY Solar MS730N-HJTGB and Sharp GSD8K66H-740WT? **MY Solar MS730N-HJTGB** has a **30 years** power warranty; **Sharp GSD8K66H-740WT** 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 MY Solar MS730N-HJTGB and Sharp GSD8K66H-740WT bifacial panels? Both **MY Solar MS730N-HJTGB** and **Sharp GSD8K66H-740WT** 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 - [MY Solar MS730N-HJTGB vs MY Solar MS740N-HJTGB](https://comparepv.com/compare/my-solar-ms730n-hjtgb/my-solar-ms740n-hjtgb) - 3 differences, the largest is module efficiency - [MY Solar MS730N-HJTGB vs MY Solar MS735N-HJTGB](https://comparepv.com/compare/my-solar-ms730n-hjtgb/my-solar-ms735n-hjtgb) - The same specification on paper - [MY Solar MS730N-HJTGB vs MY Solar MS725N-HJTGB](https://comparepv.com/compare/my-solar-ms730n-hjtgb/my-solar-ms725n-hjtgb) - The same specification on paper - [Sharp GSD8K66H-740WT vs Sharp GSD8K66H-735WT](https://comparepv.com/compare/sharp-gsd8k66h-740wt/sharp-gsd8k66h-735wt) - The same specification on paper - [Sharp GSD8K66H-740WT vs Sharp GSD8K66H-730WT](https://comparepv.com/compare/sharp-gsd8k66h-740wt/sharp-gsd8k66h-730wt) - 3 differences, the largest is module efficiency - [Sharp GSD8K66H-740WT vs Sharp GSD8K66H-725WT](https://comparepv.com/compare/sharp-gsd8k66h-740wt/sharp-gsd8k66h-725wt) - 3 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/my-solar-ms730n-hjtgb/sharp-gsd8k66h-740wt 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.