--- title: "JA Solar JAM66D46-695/LB 695W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM66D46-695/LB 695W solar panel. Specs: 22.40% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam66d46-695-lb" updated: 2026-09-11 --- # JA Solar JAM66D46-695/LB Solid all-round for its segment 249 panels in the segment TOPCon 650-700 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM66D46-695/LB - **Series:** JAM66D46 LB - **Rated power:** 695 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 650-700 W (249 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 695 W | 665 W | Strong - top 8% | | | Module efficiency | 22.40% | 22.40% | Typical | 4,774 | | Power density | 223.7 | 223.7 | Typical | 4,877 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 38.2 kg | 34.6 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.40% | 22.40% | Typical | 4,774 | | Power density | 223.7 | 223.7 | Typical | 4,877 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 55.0 | 53.2 | Typical | 9,360 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale, shaded-installations and hot-climate. ## Specification ### Electrical - **Rated power (Pmax):** 695 W - **Efficiency:** 22.40 % - **Voltage at Pmax (Vmp):** 40.22 V - **Current at Pmax (Imp):** 17.26 A - **Open-circuit voltage (Voc):** 48.00 V - **Short-circuit current (Isc):** 18.39 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.045 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.2 kg - **Area:** 3.11 m2 - **Power density:** 223.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 607 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 4774 of 14005 | | Power density | 4877 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 9360 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Up to 23.8% efficiency – premium class** - Peak module efficiency of 23.8% places the JAM66D46 LB on par with top competitors in its segment: Sharp GSD8K66H (23.82%), Tongwei TNC/THC Series (23.8%), and Just Solar JST-FCMH (23.82%). It ranks among the leading 700+ W modules from a Tier-1 manufacturer, reducing module count per installation and lowering overall BoS costs. - **N-type TOPCon: temperature coefficient and zero LID** - The temperature coefficient of Pmax is –0.29%/°C versus –0.34 to –0.36%/°C typical for PERC modules, delivering a measurable yield advantage during hot weather. N-type cells eliminate light-induced degradation (LID), stabilizing the degradation curve from year one onward and simplifying P50/P90 modeling for financed projects. - **Bifacial double-glass – albedo-driven energy gain** - An 80% (±10%) bifaciality factor enables energy harvest from ground-reflected irradiance, boosting estimated annual yield by 4–12% depending on surface albedo and tilt angle. The dual-glass construction removes the backsheet entirely, improving PID immunity and moisture resistance — critical for long-life ground-mount farms and industrial rooftops. - **30-year linear power warranty – 87.4% after 30 years** - JA Solar guarantees degradation of ≤1% in year one and ≤0.40%/year for the subsequent 29 years, maintaining at least 87.4% of rated power at year 30. This is among the most stringent commitments in the 700+ W segment — notably stronger than the typical 25-year warranties with an 84.8% end-of-life threshold offered by several competitors. - **BNEF Tier-1 bankability and market leader** - JA Solar holds BNEF Tier-1 status (under the March 2026 methodology) and ranked #1 in the Wood Mackenzie Global Solar Module Manufacturer Ranking for H1 2025, scoring 91.7/100. Strong bankability simplifies non-recourse project financing and meets lender requirements common in utility-scale PV and renewable energy project finance. ## Cons - **Fire class C (UL Type 29)** - The datasheet lists fire performance as UL Type 29 / Class C, the lowest tier in the UL fire classification scale. For ground-mount or industrial rooftop projects where local building codes or insurer requirements mandate Class A fire resistance, modules with a higher fire rating may need to be specified instead. This is not a concern for the majority of standard utility-scale ground-mount installations. ## About this series The JA Solar JAM66D46 LB series is designed for maximizing yield in installations where every square meter counts and ensuring stable performance year after year - especially on warehouse roofs, large industrial halls, and extensive PV farms. The application of **N-type TOPCon cells** translates to high resistance to light-induced degradation, facilitating predictable energy production over the long term. The **bifacial double-glass** construction allows for the use of reflected light while simultaneously enhancing the module's resistance to environmental factors critical for ground and industrial applications. The **half-cut** layout improves performance under partial shading and minimizes losses in practical installation conditions. It also helps that the **better temperature coefficient** supports efficiency during hot periods, and the refined performance under low-light conditions is another advantage. Compared to many standard PERC modules, JAM66D46 LB offers a more future-oriented technology and a more favorable long-term production profile. ## Notable figures - Efficiency of 22.4% matches the \*\*TOPCon 650-700W\*\* median - At 223.7 W/m² power density, roof space requirements are typical for \*\*TOPCon 650-700W\*\* panels - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 650-700W\*\* panels - At 38.2 kg (3.6 kg above \*\*TOPCon 650-700W\*\* median of 34.6 kg), requires checking roof load capacity - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What is the temperature coefficient of the JA Solar JAM66D46 LB and what does it mean in practice? The temperature coefficient (Pmax) is -0.29%/°C, meaning the panel loses less power per degree above 25°C than typical PERC modules (-0.35%/°C). When panel temperature reaches 65°C on a hot summer day, power loss is around 11.6% instead of ~14%. For large commercial or utility-scale systems, this difference translates into a measurable boost in annual energy yield. ### What does the bifacial double-glass design of the JAM66D46 LB offer, and is it worth the premium? Bifacial double-glass means a rear glass sheet instead of a polymer backsheet and the ability to generate power from both sides of the module. With adequate ground albedo — light-colored roofing membrane, gravel, or concrete — the rear side can contribute additional yield up to 80% of front-side output. Double-glass also provides superior protection against moisture and UV degradation, extending real-world service life compared to backsheet modules. ### What warranty does JA Solar provide on the JAM66D46 LB panels? JA Solar offers a 12-year product warranty covering manufacturing defects and workmanship, plus a 30-year linear power warranty. Maximum degradation is capped at 1% in year one and 0.40% per year thereafter, guaranteeing at least 87.4% of rated power output after 30 years of operation. ### Are JA Solar JAM66D46 LB panels suitable for installation on industrial or warehouse rooftops? Yes, the JAM66D46 LB series is purpose-built for commercial and utility-scale applications. With up to 740 W per module, fewer panels are required to reach target capacity, reducing BoS costs. The mechanical load rating of 5,400 Pa on the front side makes these modules suitable for high snow-load zones typical of large industrial roof structures. ### How do JA Solar JAM66D46 LB panels compare to standard PERC modules? N-type TOPCon technology delivers lower LID (light-induced degradation), a better temperature coefficient (-0.29%/°C vs. ~-0.35%/°C for PERC), and higher module efficiency reaching 23.8%. Compared to PERC, the JAM66D46 LB provides more stable long-term energy production, better low-irradiance performance, and a more favorable LCOE over the system lifetime. ### How many cells does the JAM66D46 LB have, and does the half-cut layout matter for commercial installations? The module contains 132 half-cut cells in a 6×22 configuration. The half-cut design reduces series resistance and ensures that partial shading — from HVAC units or skylights on a warehouse roof — affects only a portion of the module rather than the entire string. In real-world commercial mounting conditions, this results in significantly lower mismatch losses compared to full-cell modules. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/JAM66D46-695-720-LB-552197486032.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | -45 W, lighter, +2.8 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | -50 W, lighter, +2.6 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +2.6 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +2.5 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +2.4 pp | | [JA Solar JAM66D46-700/LB](https://comparepv.com/panel/ja-solar-jam66d46-700-lb) | 700 W | Very close match | | [JA Solar JAM66D46-705/LB](https://comparepv.com/panel/ja-solar-jam66d46-705-lb) | 705 W | +10 W, +0.3 pp | | [JA Solar JAM66D46-710/LB](https://comparepv.com/panel/ja-solar-jam66d46-710-lb) | 710 W | +15 W, +0.5 pp | | [JA Solar JAM66D46-715/LB](https://comparepv.com/panel/ja-solar-jam66d46-715-lb) | 715 W | +20 W, +0.6 pp | | [JA Solar JAM66D46-720/LB](https://comparepv.com/panel/ja-solar-jam66d46-720-lb) | 720 W | +25 W, +0.8 pp | | [JA Solar JAM66D46-725/LB](https://comparepv.com/panel/ja-solar-jam66d46-725-lb) | 725 W | +30 W, +0.9 pp | | [JA Solar JAM66D46-730/LB](https://comparepv.com/panel/ja-solar-jam66d46-730-lb) | 730 W | +35 W, +1.1 pp | | [JA Solar JAM66D46-735/LB](https://comparepv.com/panel/ja-solar-jam66d46-735-lb) | 735 W | +40 W, +1.3 pp | | [JA Solar JAM66D46-740/LB](https://comparepv.com/panel/ja-solar-jam66d46-740-lb) | 740 W | +45 W, +1.4 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +110 W, cooler, +2.7 pp | --- Source: https://comparepv.com/panel/ja-solar-jam66d46-695-lb Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.