--- title: "Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM645N-78HL4-BDV-F9-EU - Solar Panel Comparison | ComparePV" description: "Compare Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM645N-78HL4-BDV-F9-EU side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm645n-78hl4-bdv-f9-eu" updated: 2026-09-11 --- # Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM645N-78HL4-BDV-F9-EU JKM645N-78HL4-BDV-F9-EU leads on the differences that matter The largest is module efficiency: 0.35 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Jinko Solar JKM635N-78HL4-BDV-F9-EU](https://comparepv.com/panel/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu) | [Jinko Solar JKM645N-78HL4-BDV-F9-EU](https://comparepv.com/panel/jinko-solar-co-ltd-jkm645n-78hl4-bdv-f9-eu) | | Manufacturer | Jinko Solar | Jinko Solar | | Power | 635 Wp | 645 Wp | | Efficiency | 22.72 % | 23.07 % | | Technology | TOPCon | TOPCon | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JKM635N-78HL4-BDV-F9-EU | JKM645N-78HL4-BDV-F9-EU | Difference | | --- | --- | --- | --- | | Module efficiency | 22.72 % | 23.07 % | +0.35 pp for JKM645N-78HL4-BDV-F9-EU | | Power density | 227.2 Wp/m² | 230.7 Wp/m² | +3.6 Wp/m² for JKM645N-78HL4-BDV-F9-EU | | Rated power | 635 Wp | 645 Wp | +10 W for JKM645N-78HL4-BDV-F9-EU | ## Every compared parameter | Parameter | JKM635N-78HL4-BDV-F9-EU | JKM645N-78HL4-BDV-F9-EU | | --- | --- | --- | | Rated power | 635 Wp | 645 Wp | | Module efficiency | 22.72 % | 23.07 % | | Power density | 227.2 Wp/m² | 230.7 Wp/m² | | Open-circuit voltage | 57.21 V | 57.47 V | | Voltage at max power | 47.86 V | 48.17 V | | Short-circuit current | 13.92 A | 14.04 A | | Current at max power | 13.27 A | 13.39 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2465x1134x30 mm | 2465x1134x30 mm | | Module area | 2.795 m² | 2.795 m² | | Weight | 34.0 kg | 34.0 kg | | Weight per kWp | 53.5 kg/kWp | 52.7 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 | 156 | 156 | | 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, JKM635N-78HL4-BDV-F9-EU:** 21,306 kWh - **Cumulative output, JKM645N-78HL4-BDV-F9-EU:** 21,641 kWh - **Gap:** 335 kWh ## Output when hot | Condition | Cell temperature | JKM635N-78HL4-BDV-F9-EU | JKM645N-78HL4-BDV-F9-EU | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 635 W | 645 W | 100.0% of rated power | | Cool, bright day | 40 °C | 607 W | 617 W | 95.7% of rated power | | Typical summer roof | 55 °C | 580 W | 589 W | 91.3% of rated power | | Hot roof | 70 °C | 552 W | 561 W | 87.0% of rated power | ## Against the whole database | Measure | JKM635N-78HL4-BDV-F9-EU | JKM645N-78HL4-BDV-F9-EU | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #3,245 | #1,683 | 14,005 | JKM645N-78HL4-BDV-F9-EU leads by 1,562 places | | Power density | #3,252 | #1,654 | 14,005 | JKM645N-78HL4-BDV-F9-EU leads by 1,598 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #7,535 | #6,362 | 14,005 | JKM645N-78HL4-BDV-F9-EU leads by 1,173 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,340 | #1,852 | 14,005 | JKM645N-78HL4-BDV-F9-EU leads by 488 places | ## Questions ### Which panel is better: Jinko Solar JKM635N-78HL4-BDV-F9-EU or Jinko Solar JKM645N-78HL4-BDV-F9-EU? According to our database: **Jinko Solar JKM645N-78HL4-BDV-F9-EU** has higher module efficiency (**23.07%** vs **22.72%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Jinko Solar JKM635N-78HL4-BDV-F9-EU and Jinko Solar JKM645N-78HL4-BDV-F9-EU? **Jinko Solar JKM635N-78HL4-BDV-F9-EU** has a module efficiency of **22.72%**, while **Jinko Solar JKM645N-78HL4-BDV-F9-EU** is **23.07%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Jinko Solar JKM635N-78HL4-BDV-F9-EU use vs Jinko Solar JKM645N-78HL4-BDV-F9-EU? **Jinko Solar JKM635N-78HL4-BDV-F9-EU** uses **TOPCon** cells; **Jinko Solar JKM645N-78HL4-BDV-F9-EU** 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 Jinko Solar JKM635N-78HL4-BDV-F9-EU and Jinko Solar JKM645N-78HL4-BDV-F9-EU? **Jinko Solar JKM635N-78HL4-BDV-F9-EU** has a **30 years** power warranty; **Jinko Solar JKM645N-78HL4-BDV-F9-EU** 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 Jinko Solar JKM635N-78HL4-BDV-F9-EU and Jinko Solar JKM645N-78HL4-BDV-F9-EU bifacial panels? Both **Jinko Solar JKM635N-78HL4-BDV-F9-EU** and **Jinko Solar JKM645N-78HL4-BDV-F9-EU** 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 - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM650N-78HL4-BDV-F9-EU](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm650n-78hl4-bdv-f9-eu) - 3 differences, the largest is module efficiency - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM640N-78HL4-BDV-F9-EU](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm640n-78hl4-bdv-f9-eu) - The same specification on paper - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM630N-78HL4-BDV-F9-EU](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm630n-78hl4-bdv-f9-eu) - The same specification on paper - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM625N-78HL4-BDV-F9-EU](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm625n-78hl4-bdv-f9-eu) - 3 differences, the largest is module efficiency - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinkosolar-jkm710-735n-66hl5-bdv-z3-eu-735w-bin) - 12 differences, the largest is module efficiency - [Jinko Solar JKM635N-78HL4-BDV-F9-EU vs Jinko Solar JKM735N-66HL5-BDV-Z3-EU](https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-jkm735n-66hl5-bdv-z3-eu) - 12 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/jinko-solar-co-ltd-jkm635n-78hl4-bdv-f9-eu/jinko-solar-co-ltd-jkm645n-78hl4-bdv-f9-eu 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.