--- title: "JA Solar JAM78D40-610/MB/1500V 610W Solar Panel - Specs & Review | ComparePV" description: "JA Solar JAM78D40-610/MB/1500V 610W solar panel. Specs: 21.80% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/ja-solar-jam78d40-610-mb-1500v" updated: 2026-09-11 --- # JA Solar JAM78D40-610/MB/1500V Middle of its segment, modest efficiency 359 panels in the segment N-type 600-650 W ## Identity - **Manufacturer:** JA Solar - **Model:** JAM78D40-610/MB/1500V - **Series:** DEEP BLUE 4.0 JAM78D40 600-625/MB/1500V Series - **Rated power:** 610 W - **Cell technology:** N-type - **Bifacial:** yes ## How it compares Compared against segment N-type 600-650 W (359 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 610 W | 625 W | Weak - bottom 17% | | | Module efficiency | 21.80% | 22.77% | Weak - bottom 2% | 7,022 | | Power density | 218.2 | 227.7 | Weak - bottom 2% | 6,971 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight (kg) | 34.6 kg | 32.5 kg | Weak - bottom 8% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.80% | 22.77% | Weak - bottom 2% | 7,022 | | Power density | 218.2 | 227.7 | Weak - bottom 2% | 6,971 | | Temperature coefficient | -0.300 | -0.290 | Weak - bottom 11% | 6,093 | | Weight per kWp | 56.7 | 52.7 | Weak - bottom 8% | 10,826 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **21.80% module efficiency** - Bottom 2% of the N-type 600-650 W segment, against a median of 22.77%. Ranked 7,022nd in the whole database. - **218.2 watts per square metre** - Bottom 2% of the N-type 600-650 W segment, against a median of 227.7. Ranked 6,971st in the whole database. - **56.7 kg per kWp** - Bottom 8% of the N-type 600-650 W segment, against a median of 52.7. Ranked 10,826th in the whole database. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Tight roof space, roofs where every square metre has to count and weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 610 W - **Efficiency:** 21.80 % - **Voltage at Pmax (Vmp):** 45.94 V - **Current at Pmax (Imp):** 13.28 A - **Open-circuit voltage (Voc):** 55.05 V - **Short-circuit current (Isc):** 14.16 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.300 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** N-type - **Cell count:** 156 - **Bifacial:** yes ### Physical - **Length:** 2465 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 34.6 kg - **Area:** 2.80 m2 - **Power density:** 218.2 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:** 533 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7022 of 14005 | | Power density | 6971 of 14005 | | Temperature coefficient | 6093 of 14005 | | Weight | 10826 of 14005 | | Warranty | 21 of 14005 | ## Pros - **N-type Bycium+ with SMBB** - N-type cells exhibit lower light-induced degradation (LID) than standard PERC and a superior temperature coefficient of Pmax at -0.30%/°C. At typical summer module temperatures of 60–70°C, this translates into measurably higher energy yield compared to P-type modules in the same power class. The Super Multi Busbar (SMBB) design further reduces series resistance and improves capture of diffuse photons. - **Bifacial dual-glass construction** - The bifacial design enables additional energy harvest from reflected irradiance off the ground surface (bifacial gain typically 5–15% depending on albedo), while the dual-glass 2+2 mm structure eliminates microcrack risk from transport stress and snow/wind loading. Removing the backsheet also eliminates PID and moisture-driven PO degradation pathways. - **30-year linear power warranty** - JA Solar guarantees ≥93.4% rated power retention after 15 years and ≥87.4% after 30 years, with a 0.4%/year linear degradation rate and only 1% first-year degradation. For utility-scale projects targeting a 30+ year asset life, these parameters directly reduce LCOE compared to series offering only 25-year warranties with ~0.55%/year degradation. - **BNEF Tier-1 manufacturer (global top 4)** - JA Solar is listed on the BNEF Tier-1 Solar Module Manufacturers list as of Q1 2026, with 100 GW of annual production capacity, ranking in the global top four alongside LONGi, Jinko Solar, and Trina Solar. This status satisfies bankability requirements for non-recourse project financing at most international lending institutions. ## Cons - **Discontinued series (EOL 2023)** - The JAM78D40 600–625/MB series reached end-of-life in 2023. Limited availability of new modules increases the risk of being unable to source additional panels for capacity additions, and a shortened support chain may complicate enforcement of the 12-year product warranty for claims filed after 2030. - **Efficiency below peer-comparable leaders** - The series peaks at 22.4% module efficiency, while direct 625 Wp competitors achieve: LONGi Hi-MO 7 LR8-66HGD — 23.1%, DAH Solar DHN-66Z16/DG — 23.14%. The 0.7–0.74 percentage-point gap means competing modules produce approximately 3% more energy for the same array footprint — a quantifiable LCOE disadvantage on projects above 5 MWp. ## About this series The JA Solar DEEP BLUE 4.0 JAM78D40 600-625/MB/1500V series is based on the groundbreaking **n-type Bycium+ cell** architecture, which sets new efficiency standards in the industrial sector. The use of SMBB technology allows for better light absorption and minimization of transmission losses, resulting in stable operation even in challenging lighting conditions. These panels solve the key problem of limited installation space by offering high power density while simultaneously reducing BOS system costs and LCOE. Thanks to the **bifacial (double-sided)** design, these modules generate additional energy from reflected radiation, making them an ideal choice for large-scale photovoltaic farms and advanced commercial installations. A standout feature compared to the competition is the exceptionally **low temperature coefficient** and minimal light-induced degradation (LID), which guarantees longevity and maximizes profits throughout the power plant's entire life cycle. The robust double-glass construction ensures **maximum mechanical resistance** to extreme weather events, protecting the investment from micro-cracks. This is an advanced solution for investors seeking uncompromising reliability and the highest return on capital in the Polish renewable energy market. ## Notable figures - Efficiency of 21.8% is 1.0pp below the \*\*N-type 600-650W\*\* median (22.8%) - Power density of 218.2 W/m² is 9.5 W/m² below \*\*N-type 600-650W\*\* median (227.7 W/m²) - needs more roof space - At -0.30%/°C, hot weather performance is typical for \*\*N-type 600-650W\*\* panels - Weight of 34.6 kg is 2.1 kg above \*\*N-type 600-650W\*\* median (32.5 kg) - verify structural support - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### Is the JA Solar DEEP BLUE 4.0 JAM78D40 600-625/MB/1500V series still available for purchase? The JAM78D40 600-625/MB/1500V series has been discontinued and is no longer actively offered by JA Solar. Limited quantities may still be available through distributors with existing stock. If you need a current equivalent, consider JA Solar's newer DEEP BLUE 4.0 Pro or 4.0 X series, which continue the same product line with further improved cell efficiency. ### What warranty does the JA Solar JAM78D40-625/MB panel carry and what does it cover? JA Solar provides a 12-year product warranty on the JAM78D40 625/MB modules. The linear power warranty runs for 30 years, guaranteeing at least 87.4% of nominal output at the end of that period. Year-1 degradation is capped below 1%, and the annual linear degradation rate is approximately 0.4%, enabled by the LID-resistant n-type Bycium+ cell technology. ### What does the bifacial design of the JAM78D40 mean in practice, and who is this series intended for? The bifacial construction allows JAM78D40 modules to generate power from both direct front-side irradiance and reflected irradiance from the ground surface (albedo). For utility-scale ground-mounted systems with light-colored or gravel ground covers, this can deliver 5–15% more energy yield compared to a monofacial module of similar rating. This series is designed primarily for large-scale PV farms and commercial systems, not residential rooftop installations. ### Do the JAM78D40 625W panels perform well in low winter temperatures? Yes. The n-type Bycium+ cells feature a power temperature coefficient (Pmax) of approximately -0.30%/°C, which is more favorable than standard PERC panels at -0.35%/°C. This means lower power losses during hot summer days and stable year-round performance. In Poland's cold climate, low winter temperatures actually improve instantaneous module efficiency, making these panels well-suited for local conditions. ### What are the dimensions and weight of the JAM78D40-625/MB module, and does that affect installation? The JAM78D40-625/MB module measures 2465 x 1134 x 35 mm and weighs approximately 34.6 kg. This is a large-format module designed for utility-scale and commercial installations. Due to its size and weight, installation requires at least two workers or dedicated lifting equipment. It is not intended for typical single-family residential rooftop systems. ### How does n-type Bycium+ technology differ from PERC cells, and why does it matter for investors? The n-type Bycium+ cells in the JAM78D40 series are built on n-type silicon, which eliminates light-induced degradation (LID) common in p-type PERC cells. This results in greater long-term durability, module efficiency of up to 22.4%, and a lower temperature coefficient. The SMBB (Super Multi Busbar) design further shortens current paths and reduces resistive losses, delivering measurably better ROI over the full 30-year system lifetime. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/20230304083534163-7629d0ce6613.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +40 W, lighter, +3.4 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +3.2 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | -50 W, lighter, +3.0 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +3.0 pp | | [AIKO AIKO-A635-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a635-mae72mw) | 635 W | Cooler, lighter, +2.8 pp | | [Longi Solar LR8-66HVD-660M](https://comparepv.com/panel/longi-lr8-66hvd-660m) | 660 W | +50 W, cooler, +2.6 pp | | [JA Solar JAM78S30-580/MR](https://comparepv.com/panel/ja-solar-jam78s30-580-mr) | 580 W | Hotter, -1.1 pp, -5 yr warranty | | [JA Solar JAM78S30-585/MR](https://comparepv.com/panel/ja-solar-jam78s30-585-mr) | 585 W | Hotter, -0.9 pp, -5 yr warranty | | [JA Solar JAM78S30-590/MR](https://comparepv.com/panel/ja-solar-jam78s30-590-mr) | 590 W | Hotter, lighter, -5 yr warranty | | [JA Solar JAM78S30-595/MR](https://comparepv.com/panel/ja-solar-jam78s30-595-mr) | 595 W | Hotter, lighter, -5 yr warranty | | [JA Solar JAM78S30-600/MR](https://comparepv.com/panel/ja-solar-jam78s30-600-mr) | 600 W | Hotter, lighter, -5 yr warranty | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +70 W, lighter, +3.4 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +65 W, lighter, +3.2 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +90 W, cooler, +3.2 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +85 W, cooler, +3.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +60 W, lighter, +3.0 pp | --- Source: https://comparepv.com/panel/ja-solar-jam78d40-610-mb-1500v 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.