--- title: "Gokin GK-4-78HGBD-775M vs MY Solar MS730N-HJTGB - Solar Panel Comparison | ComparePV" description: "Compare Gokin GK-4-78HGBD-775M vs MY Solar MS730N-HJTGB side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/my-solar-ms730n-hjtgb" updated: 2026-09-11 --- # Gokin GK-4-78HGBD-775M vs MY Solar MS730N-HJTGB GK-4-78HGBD-775M leads on the differences that matter The largest is rated power: 45 W more power. 4 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 | [Gokin GK-4-78HGBD-775M](https://comparepv.com/panel/gokin-gk-4-78hgbd-775m) | [MY Solar MS730N-HJTGB](https://comparepv.com/panel/my-solar-ms730n-hjtgb) | | Manufacturer | Gokin | MY Solar | | Power | 775 Wp | 730 Wp | | Efficiency | 24.10 % | 23.50 % | | Technology | Back Contact | HJT | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | GK-4-78HGBD-775M | MS730N-HJTGB | Difference | | --- | --- | --- | --- | | Rated power | 775 Wp | 730 Wp | +45 W for GK-4-78HGBD-775M | | Module efficiency | 24.10 % | 23.50 % | +0.60 pp for GK-4-78HGBD-775M | | Product warranty | 15 yrs | 30 yrs | +15 yrs for MS730N-HJTGB | | Temperature coefficient | -0.260 %/°C | -0.240 %/°C | +0.020 %/°C for MS730N-HJTGB | | Power density | 241.3 Wp/m² | 235.0 Wp/m² | +6.3 Wp/m² for GK-4-78HGBD-775M | | Open-circuit voltage | 58.82 V | 51.05 V | 7.77 V apart | | Module area | 3.212 m² | 3.106 m² | 0.106 m² apart | | Cell technology | Back Contact | HJT | Back Contact vs HJT | | Short-circuit current | 16.71 A | 17.81 A | 1.10 A apart | | Voltage at max power | 48.87 V | 42.97 V | 5.90 V apart | | Cell count | 156 | 132 | 24 cells apart | | Weight per kWp | 49.9 kg/kWp | 52.5 kg/kWp | -2.5 kg/kWp for GK-4-78HGBD-775M | | Current at max power | 15.86 A | 16.99 A | 1.13 A apart | | Dimensions | 2465x1303x33 mm | 2384x1303x35 mm | 2465x1303x33 mm vs 2384x1303x35 mm | ## Every compared parameter | Parameter | GK-4-78HGBD-775M | MS730N-HJTGB | | --- | --- | --- | | Rated power | 775 Wp | 730 Wp | | Module efficiency | 24.10 % | 23.50 % | | Power density | 241.3 Wp/m² | 235.0 Wp/m² | | Open-circuit voltage | 58.82 V | 51.05 V | | Voltage at max power | 48.87 V | 42.97 V | | Short-circuit current | 16.71 A | 17.81 A | | Current at max power | 15.86 A | 16.99 A | | Temperature coefficient | -0.260 %/°C | -0.240 %/°C | | Dimensions | 2465x1303x33 mm | 2384x1303x35 mm | | Module area | 3.212 m² | 3.106 m² | | Weight | 38.7 kg | 38.3 kg | | Weight per kWp | 49.9 kg/kWp | 52.5 kg/kWp | | Product warranty | 15 yrs | 30 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.35 %/yr | - | | Cell technology | Back Contact | HJT | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 156 | 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, GK-4-78HGBD-775M:** 26,003 kWh - **Cumulative output, MS730N-HJTGB:** 24,493 kWh - **Gap:** 1,510 kWh ## Output when hot | Condition | Cell temperature | GK-4-78HGBD-775M | MS730N-HJTGB | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 775 W | 730 W | 100.0% of rated power | | Cool, bright day | 40 °C | 745 W | 704 W | 96.1% of rated power | | Typical summer roof | 55 °C | 715 W | 677 W | 92.2% of rated power | | Hot roof | 70 °C | 684 W | 651 W | 88.3% of rated power | ## Against the whole database | Measure | GK-4-78HGBD-775M | MS730N-HJTGB | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #219 | #716 | 14,005 | GK-4-78HGBD-775M leads by 497 places | | Power density | #227 | #800 | 14,005 | GK-4-78HGBD-775M leads by 573 places | | Heat behaviour | #511 | #13 | 14,005 | MS730N-HJTGB leads by 498 places | | Weight | #3,297 | #5,993 | 14,005 | GK-4-78HGBD-775M leads by 2,696 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #29 | #8 | 14,005 | MS730N-HJTGB leads by 21 places | ## Questions ### Which panel is better: Gokin GK-4-78HGBD-775M or MY Solar MS730N-HJTGB? According to our database: **Gokin GK-4-78HGBD-775M** has higher module efficiency (**24.10%** 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 Gokin GK-4-78HGBD-775M and MY Solar MS730N-HJTGB? **Gokin GK-4-78HGBD-775M** has a module efficiency of **24.10%**, while **MY Solar MS730N-HJTGB** is **23.50%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Gokin GK-4-78HGBD-775M use vs MY Solar MS730N-HJTGB? **Gokin GK-4-78HGBD-775M** uses **Back Contact** cells; **MY Solar MS730N-HJTGB** 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 Gokin GK-4-78HGBD-775M and MY Solar MS730N-HJTGB? **Gokin GK-4-78HGBD-775M** has a **30 years** power warranty; **MY Solar MS730N-HJTGB** 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 Gokin GK-4-78HGBD-775M and MY Solar MS730N-HJTGB bifacial panels? Both **Gokin GK-4-78HGBD-775M** and **MY Solar MS730N-HJTGB** 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 - [Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-780M](https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/gokin-gk-4-78hgbd-780m) - One difference: module efficiency - [Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-770M](https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/gokin-gk-4-78hgbd-770m) - The same specification on paper - [Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-765M](https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/gokin-gk-4-78hgbd-765m) - 3 differences, the largest is module efficiency - [Gokin GK-4-78HGBD-775M vs Gokin GK-4-78HGBD-760M](https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/gokin-gk-4-78hgbd-760m) - 3 differences, the largest is module efficiency - [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 --- Source: https://comparepv.com/compare/gokin-gk-4-78hgbd-775m/my-solar-ms730n-hjtgb 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.