--- title: "Jetion JT775SXt(B) vs Jetion JT780SXt(B) - Solar Panel Comparison | ComparePV" description: "Compare Jetion JT775SXt(B) vs Jetion JT780SXt(B) side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt780sxt-b" updated: 2026-09-11 --- # Jetion JT775SXt(B) vs Jetion JT780SXt(B) JT780SXt(B) leads on the differences that matter The largest is module efficiency: 0.20 pp more efficient. 18 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Jetion JT775SXt(B)](https://comparepv.com/panel/jetion-jt775sxt-b) | [Jetion JT780SXt(B)](https://comparepv.com/panel/jetion-jt780sxt-b) | | Manufacturer | Jetion | Jetion | | Power | 775 Wp | 780 Wp | | Efficiency | 22.90 % | 23.10 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JT775SXt(B) | JT780SXt(B) | Difference | | --- | --- | --- | --- | | Module efficiency | 22.90 % | 23.10 % | +0.20 pp for JT780SXt(B) | ## Every compared parameter | Parameter | JT775SXt(B) | JT780SXt(B) | | --- | --- | --- | | Rated power | 775 Wp | 780 Wp | | Module efficiency | 22.90 % | 23.10 % | | Power density | 229.2 Wp/m² | 230.7 Wp/m² | | Open-circuit voltage | 53.41 V | 53.60 V | | Voltage at max power | 44.96 V | 45.10 V | | Short-circuit current | 18.45 A | 18.50 A | | Current at max power | 17.24 A | 17.30 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2595x1303x33 mm | 2595x1303x33 mm | | Module area | 3.381 m² | 3.381 m² | | Weight | 40.0 kg | 40.0 kg | | Weight per kWp | 51.6 kg/kWp | 51.3 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | TOPCon | TOPCon | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 144 | | 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 (-0.290 %/°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, JT775SXt(B):** 26,003 kWh - **Cumulative output, JT780SXt(B):** 26,171 kWh - **Gap:** 168 kWh ## Output when hot | Condition | Cell temperature | JT775SXt(B) | JT780SXt(B) | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 775 W | 780 W | 100.0% of rated power | | Cool, bright day | 40 °C | 741 W | 746 W | 95.7% of rated power | | Typical summer roof | 55 °C | 708 W | 712 W | 91.3% of rated power | | Hot roof | 70 °C | 674 W | 678 W | 87.0% of rated power | ## Against the whole database | Measure | JT775SXt(B) | JT780SXt(B) | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #2,359 | #1,570 | 14,005 | JT780SXt(B) leads by 789 places | | Power density | #2,377 | #1,683 | 14,005 | JT780SXt(B) leads by 694 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #4,981 | #4,670 | 14,005 | JT780SXt(B) leads by 311 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #169 | #129 | 14,005 | JT780SXt(B) leads by 40 places | ## Questions ### Which panel is better: Jetion JT775SXt(B) or Jetion JT780SXt(B)? According to our database: **Jetion JT780SXt(B)** has higher module efficiency (**23.10%** vs **22.90%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Jetion JT775SXt(B) and Jetion JT780SXt(B)? **Jetion JT775SXt(B)** has a module efficiency of **22.90%**, while **Jetion JT780SXt(B)** is **23.10%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Jetion JT775SXt(B) use vs Jetion JT780SXt(B)? **Jetion JT775SXt(B)** uses **TOPCon** cells; **Jetion JT780SXt(B)** 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 Jetion JT775SXt(B) and Jetion JT780SXt(B)? **Jetion JT775SXt(B)** has a **30 years** power warranty; **Jetion JT780SXt(B)** 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 Jetion JT775SXt(B) and Jetion JT780SXt(B) bifacial panels? Both **Jetion JT775SXt(B)** and **Jetion JT780SXt(B)** 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 - [Jetion JT775SXt(B) vs Jetion JT800SXt(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt800sxt-b) - 3 differences, the largest is module efficiency - [Jetion JT775SXt(B) vs Jetion JT795SXt(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt795sxt-b) - 3 differences, the largest is module efficiency - [Jetion JT775SXt(B) vs Jetion JT790SXt(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt790sxt-b) - 3 differences, the largest is module efficiency - [Jetion JT775SXt(B) vs Jetion JT785SXt(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt785sxt-b) - 2 differences, the largest is module efficiency - [Jetion JT775SXt(B) vs Jetion JT755SLk(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt755slk-b) - 14 differences, the largest is module efficiency - [Jetion JT775SXt(B) vs Jetion JT750SLk(B)](https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt750slk-b) - 14 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/jetion-jt775sxt-b/jetion-jt780sxt-b 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.