--- title: "Jetion JT795SXt(B) vs Longi Solar LR8-66HYD-670M - Solar Panel Comparison | ComparePV" description: "Compare Jetion JT795SXt(B) vs Longi Solar LR8-66HYD-670M side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/jetion-jt795sxt-b/longi-lr8-66hyd-670m" updated: 2026-09-11 --- # Jetion JT795SXt(B) vs Longi Solar LR8-66HYD-670M LR8-66HYD-670M leads on the differences that matter The largest is module efficiency: 1.30 pp more efficient. 5 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 | [Jetion JT795SXt(B)](https://comparepv.com/panel/jetion-jt795sxt-b) | [Longi Solar LR8-66HYD-670M](https://comparepv.com/panel/longi-lr8-66hyd-670m) | | Manufacturer | Jetion | Longi Solar | | Power | 795 Wp | 670 Wp | | Efficiency | 23.50 % | 24.80 % | | Technology | TOPCon | Back Contact | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JT795SXt(B) | LR8-66HYD-670M | Difference | | --- | --- | --- | --- | | Module efficiency | 23.50 % | 24.80 % | +1.30 pp for LR8-66HYD-670M | | Rated power | 795 Wp | 670 Wp | +125 W for JT795SXt(B) | | Power density | 235.1 Wp/m² | 248.0 Wp/m² | +12.9 Wp/m² for LR8-66HYD-670M | | Temperature coefficient | -0.290 %/°C | -0.260 %/°C | +0.030 %/°C for LR8-66HYD-670M | | Weight | 40.0 kg | 33.5 kg | -6.5 kg for LR8-66HYD-670M | | Open-circuit voltage | 54.17 V | 50.12 V | 4.05 V apart | | Module area | 3.381 m² | 2.701 m² | 0.680 m² apart | | Short-circuit current | 18.67 A | 16.86 A | 1.81 A apart | | Cell technology | TOPCon | Back Contact | TOPCon vs Back Contact | | Voltage at max power | 45.53 V | 41.38 V | 4.15 V apart | | Cell count | 144 | 132 | 12 cells apart | | Current at max power | 17.47 A | 16.19 A | 1.28 A apart | | Dimensions | 2595x1303x33 mm | 2382x1134x30 mm | 2595x1303x33 mm vs 2382x1134x30 mm | ## Every compared parameter | Parameter | JT795SXt(B) | LR8-66HYD-670M | | --- | --- | --- | | Rated power | 795 Wp | 670 Wp | | Module efficiency | 23.50 % | 24.80 % | | Power density | 235.1 Wp/m² | 248.0 Wp/m² | | Open-circuit voltage | 54.17 V | 50.12 V | | Voltage at max power | 45.53 V | 41.38 V | | Short-circuit current | 18.67 A | 16.86 A | | Current at max power | 17.47 A | 16.19 A | | Temperature coefficient | -0.290 %/°C | -0.260 %/°C | | Dimensions | 2595x1303x33 mm | 2382x1134x30 mm | | Module area | 3.381 m² | 2.701 m² | | Weight | 40.0 kg | 33.5 kg | | Weight per kWp | 50.3 kg/kWp | 50.0 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | - | | Cell technology | TOPCon | Back Contact | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 144 | 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, JT795SXt(B):** 26,674 kWh - **Cumulative output, LR8-66HYD-670M:** 22,480 kWh - **Gap:** 4,194 kWh ## Output when hot | Condition | Cell temperature | JT795SXt(B) | LR8-66HYD-670M | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 795 W | 670 W | 100.0% of rated power | | Cool, bright day | 40 °C | 760 W | 644 W | 95.7% of rated power | | Typical summer roof | 55 °C | 726 W | 618 W | 91.3% of rated power | | Hot roof | 70 °C | 691 W | 592 W | 87.0% of rated power | ## Against the whole database | Measure | JT795SXt(B) | LR8-66HYD-670M | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #716 | #12 | 14,005 | LR8-66HYD-670M leads by 704 places | | Power density | #740 | #14 | 14,005 | LR8-66HYD-670M leads by 726 places | | Heat behaviour | #2,165 | #511 | 14,005 | LR8-66HYD-670M leads by 1,654 places | | Weight | #3,713 | #3,317 | 14,005 | LR8-66HYD-670M leads by 396 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #54 | #490 | 14,005 | JT795SXt(B) leads by 436 places | ## Questions ### Which panel is better: Jetion JT795SXt(B) or Longi Solar LR8-66HYD-670M? According to our database: **Longi Solar LR8-66HYD-670M** has higher module efficiency (**24.80%** vs **23.50%**); **Longi Solar LR8-66HYD-670M** tolerates heat better (temp coeff **-0.260%/°C** vs **-0.290%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Jetion JT795SXt(B) and Longi Solar LR8-66HYD-670M? **Jetion JT795SXt(B)** has a module efficiency of **23.50%**, while **Longi Solar LR8-66HYD-670M** is **24.80%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Jetion JT795SXt(B) use vs Longi Solar LR8-66HYD-670M? **Jetion JT795SXt(B)** uses **TOPCon** cells; **Longi Solar LR8-66HYD-670M** uses **Back Contact**. 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 JT795SXt(B) and Longi Solar LR8-66HYD-670M? **Jetion JT795SXt(B)** has a **30 years** power warranty; **Longi Solar LR8-66HYD-670M** 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 JT795SXt(B) and Longi Solar LR8-66HYD-670M bifacial panels? Both **Jetion JT795SXt(B)** and **Longi Solar LR8-66HYD-670M** 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 JT795SXt(B) vs Jetion JT800SXt(B)](https://comparepv.com/compare/jetion-jt795sxt-b/jetion-jt800sxt-b) - One difference: module efficiency - [Jetion JT795SXt(B) vs Jetion JT790SXt(B)](https://comparepv.com/compare/jetion-jt795sxt-b/jetion-jt790sxt-b) - The same specification on paper - [Jetion JT795SXt(B) vs Jetion JT785SXt(B)](https://comparepv.com/compare/jetion-jt795sxt-b/jetion-jt785sxt-b) - 2 differences, the largest is module efficiency - [Jetion JT795SXt(B) vs Jetion JT780SXt(B)](https://comparepv.com/compare/jetion-jt795sxt-b/jetion-jt780sxt-b) - 3 differences, the largest is module efficiency - [Jetion JT795SXt(B) vs Jetion JT775SXt(B)](https://comparepv.com/compare/jetion-jt795sxt-b/jetion-jt775sxt-b) - 3 differences, the largest is module efficiency - [Longi Solar LR8-66HYD-670M vs Longi Solar LR8-66HYD-665M](https://comparepv.com/compare/longi-lr8-66hyd-670m/longi-lr8-66hyd-665m) - One difference: module efficiency --- Source: https://comparepv.com/compare/jetion-jt795sxt-b/longi-lr8-66hyd-670m 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.