--- title: "Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM640N-66HL4M-BDV - Solar Panel Comparison | ComparePV" description: "Compare Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM640N-66HL4M-BDV 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-jkm625n-66hl4m-bdv/jinko-solar-jkm640n-66hl4m-bdv" updated: 2026-09-11 --- # Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM640N-66HL4M-BDV JKM640N-66HL4M-BDV leads on the differences that matter The largest is module efficiency: 0.55 pp more efficient. 16 of 19 comparable parameters are identical. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Jinko Solar JKM625N-66HL4M-BDV](https://comparepv.com/panel/jinko-solar-jkm625n-66hl4m-bdv) | [Jinko Solar JKM640N-66HL4M-BDV](https://comparepv.com/panel/jinko-solar-jkm640n-66hl4m-bdv) | | Manufacturer | Jinko Solar | Jinko Solar | | Power | 625 Wp | 640 Wp | | Efficiency | 23.14 % | 23.69 % | | Technology | N-type | N-type | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | JKM625N-66HL4M-BDV | JKM640N-66HL4M-BDV | Difference | | --- | --- | --- | --- | | Module efficiency | 23.14 % | 23.69 % | +0.55 pp for JKM640N-66HL4M-BDV | | Power density | 231.4 Wp/m² | 236.9 Wp/m² | +5.6 Wp/m² for JKM640N-66HL4M-BDV | | Rated power | 625 Wp | 640 Wp | +15 W for JKM640N-66HL4M-BDV | ## Every compared parameter | Parameter | JKM625N-66HL4M-BDV | JKM640N-66HL4M-BDV | | --- | --- | --- | | Rated power | 625 Wp | 640 Wp | | Module efficiency | 23.14 % | 23.69 % | | Power density | 231.4 Wp/m² | 236.9 Wp/m² | | Open-circuit voltage | 49.28 V | 49.88 V | | Voltage at max power | 40.88 V | 41.30 V | | Short-circuit current | 16.14 A | 16.32 A | | Current at max power | 15.29 A | 15.50 A | | Temperature coefficient | -0.290 %/°C | -0.290 %/°C | | Dimensions | 2382x1134x30 mm | 2382x1134x30 mm | | Module area | 2.701 m² | 2.701 m² | | Weight | 32.4 kg | 32.4 kg | | Weight per kWp | 51.8 kg/kWp | 50.6 kg/kWp | | Product warranty | 12 yrs | 12 yrs | | Performance warranty | 30 yrs | 30 yrs | | Annual degradation | 0.40 %/yr | 0.40 %/yr | | Cell technology | N-type | N-type | | Cell type | Monocrystalline | Monocrystalline | | Cell count | 132 | 132 | | 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, JKM625N-66HL4M-BDV:** 20,970 kWh - **Cumulative output, JKM640N-66HL4M-BDV:** 21,473 kWh - **Gap:** 503 kWh ## Output when hot | Condition | Cell temperature | JKM625N-66HL4M-BDV | JKM640N-66HL4M-BDV | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 625 W | 640 W | 100.0% of rated power | | Cool, bright day | 40 °C | 598 W | 612 W | 95.7% of rated power | | Typical summer roof | 55 °C | 571 W | 584 W | 91.3% of rated power | | Hot roof | 70 °C | 543 W | 556 W | 87.0% of rated power | ## Against the whole database | Measure | JKM625N-66HL4M-BDV | JKM640N-66HL4M-BDV | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #1,509 | #580 | 14,005 | JKM640N-66HL4M-BDV leads by 929 places | | Power density | #1,513 | #521 | 14,005 | JKM640N-66HL4M-BDV leads by 992 places | | Heat behaviour | #2,165 | #2,165 | 14,005 | Tied - the same position in the database | | Weight | #5,218 | #4,069 | 14,005 | JKM640N-66HL4M-BDV leads by 1,149 places | | Warranty | #21 | #21 | 14,005 | Tied - the same position in the database | | Overall | #2,239 | #1,530 | 14,005 | JKM640N-66HL4M-BDV leads by 709 places | ## Questions ### Which panel is better: Jinko Solar JKM625N-66HL4M-BDV or Jinko Solar JKM640N-66HL4M-BDV? According to our database: **Jinko Solar JKM640N-66HL4M-BDV** has higher module efficiency (**23.69%** vs **23.14%**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Jinko Solar JKM625N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV? **Jinko Solar JKM625N-66HL4M-BDV** has a module efficiency of **23.14%**, while **Jinko Solar JKM640N-66HL4M-BDV** is **23.69%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Jinko Solar JKM625N-66HL4M-BDV use vs Jinko Solar JKM640N-66HL4M-BDV? **Jinko Solar JKM625N-66HL4M-BDV** uses **N-type** cells; **Jinko Solar JKM640N-66HL4M-BDV** uses **N-type**. 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 JKM625N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV? **Jinko Solar JKM625N-66HL4M-BDV** has a **30 years** power warranty; **Jinko Solar JKM640N-66HL4M-BDV** 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 JKM625N-66HL4M-BDV and Jinko Solar JKM640N-66HL4M-BDV bifacial panels? Both **Jinko Solar JKM625N-66HL4M-BDV** and **Jinko Solar JKM640N-66HL4M-BDV** 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 JKM625N-66HL4M-BDV vs Jinko Solar JKM635N-66HL4M-BDV](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm635n-66hl4m-bdv) - 3 differences, the largest is module efficiency - [Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM630N-66HL4M-BDV](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm630n-66hl4m-bdv) - The same specification on paper - [Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM620N-66HL4M-BDV](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm620n-66hl4m-bdv) - The same specification on paper - [Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM615N-66HL4M-BDV](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm615n-66hl4m-bdv) - 3 differences, the largest is module efficiency - [Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM710-735N-66HL5-BDV-Z3-EU (735W bin)](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinkosolar-jkm710-735n-66hl5-bdv-z3-eu-735w-bin) - 9 differences, the largest is rated power - [Jinko Solar JKM625N-66HL4M-BDV vs Jinko Solar JKM735N-66HL5-BDV-Z3-EU](https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm735n-66hl5-bdv-z3-eu) - 9 differences, the largest is rated power --- Source: https://comparepv.com/compare/jinko-solar-jkm625n-66hl4m-bdv/jinko-solar-jkm640n-66hl4m-bdv 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.