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JA Solar JAM60D10-320/MB/1500V
JA Solar Brand review

JAM60D10-320/MB/1500V

320 Wp PERC Bifacial 70%
ComparePV verdict

Warranty pick, heavy for its output

Rank 13,151 of 14,129
Compare panels Datasheet PDF
Power (Wp)
320
Typical for its class
Efficiency (%)
18.60
Typical · median 19.00%
Density (Wp/m²)
186.1
Typical · median 190.0
Temp (%/°C)
-0.354
Strong · top 17%
Weight (kg)
22.0
Weak · 3.0 kg above median
Warranty (yrs)
30
Strong · top 16%

JA Solar JAM60D10 320-345/MB/1500V series is designed for installations where reliable operation in real-world conditions is key - including partial shading and high temperatures. The application of PERC monocrystalline cells combined with half-cell construction minimizes module losses, improves performance under uneven irradiance, and reduces heating risks, translating to a more certain annual yield. Additionally, Multi Busbar (MBB) technology enhances current collection from the cells, increasing resistance to microcracks and maintaining parameters over a longer period.

This is an excellent choice for installers and investors seeking modules for single-family homes, small businesses, and projects where compatibility with modern system architecture is crucial, thanks to the adaptation to 1500V voltage. Compared to competitors, the series stands out through a practical combination of durability, operational resilience, and predictable degradation over a long horizon, rather than promising "paper specifications."

Ranking

291 panels in the segment PERC 300-350 W
Metric This panel Median Position in segment Overall rank
Module efficiency 18.60% 19.00% Typical 13,181
Power density 186.1 190.0 Typical 13,162
Temperature coefficient -0.354 -0.360 Strong · top 17% 12,365
Weight per kWp 68.8 60.3 Weak · bottom 22% 13,461
Performance warranty 30 yrs 25 yrs Strong · top 16% 21
Colour key Strong - top 25% Typical - middle 50% Weak - bottom 25%

Signals from the data

7 positive · 4 caution
Best for

Residential, commercial and shaded-installations.

Not ideal for

Weight-limited structures.

Strengths
30 year performance warranty

Top 16% of the PERC 300-350 W segment, against a median of 25 yrs.

-0.354 %/°C temperature coefficient

Top 17% of the PERC 300-350 W segment, against a median of -0.360.

Watch-outs
68.8 kg per kWp

Bottom 22% of the PERC 300-350 W segment, against a median of 60.3.

What owners get
Tier-1 manufacturer - full bankability

JA Solar has maintained BNEF Tier-1 status for over a decade and ranks among the global top five module manufacturers (alongside LONGi, Jinko, Trina, and Tongwei) with production capacity exceeding 100 GWp. For bank- or lease-financed projects, this classification is a standard prerequisite that eliminates counterparty risk.

Four technologies in a single module

The series combines monocrystalline PERC cells, half-cut configuration, multi-busbar (MBB) technology, and bifacial double-glass construction - an advanced package for its 2019 launch date. Half-cut cells reduce resistive losses, MBB lowers sensitivity to microcracks, and bifacial design enables rear-side energy harvest (typically +5-15% depending on ground albedo).

30-year linear power warranty

JA Solar guarantees output performance for 30 years - five years beyond the 25-year standard common among mid-range competitors. The extended warranty horizon directly improves LCOE calculations for bank-financed projects and long-term PPA structures.

1500 V DC system compatibility

Compatibility with 1500 V system voltage allows longer string configurations, fewer inverters, and less DC cabling, reducing Balance of System (BoS) costs compared to legacy 1000 V designs. This is particularly relevant for commercial rooftop and small utility-scale installations.

18.6% efficiency - above the segment's lower bound

Among the peer comparables, the series outperforms the TPL Solar TPLM-72 Series (16.54%) by 2.06 percentage points, translating to meaningfully higher energy yield per unit of roof area. While not a top-tier efficiency figure, it is adequate for space-constrained residential and commercial PV systems.

Trade-offs
Discontinued series (EOL 2022)

The JAM60D10 series reached end-of-life in 2022 after only three years of production (2019-2022). Availability is limited to distributor stock, and long-term serviceability - including replacement frames, seals, and bypass diodes - is uncertain over a 25-30-year operational lifetime. This is a material risk for projects requiring long-term O&M planning.

Efficiency below peer leaders

At 18.6% conversion efficiency, the series trails two direct comparables: Sun Earth AGRI Mono Half Cell PV Module (19.55%) and JS Solar 60+ Series (19.67%) by 0.95-1.07 percentage points. On a 10 kWp system, this gap equates to roughly 0.5-0.6 m² more roof area required to deliver equivalent output - a relevant constraint on space-limited rooftops.

12-year product warranty - below current standard

The industry benchmark for Tier-1 modules has shifted toward 15-25-year product warranties (JA Solar's own DeepBlue 4.0 series carries a 15-year product warranty). A 12-year term means that from approximately 2034-2036 onward, buyers of newly installed units will have no manufacturer coverage for workmanship or material defects, even as the 30-year power warranty remains active.

Notes from the database
  • Efficiency of 18.6% is 0.8pp below the PERC 0-400W median (19.4%)
  • 186.1 W/m² power density is 8.1 W/m² below PERC 0-400W median (194.2 W/m²) - requires larger installation area
  • Temperature coefficient of -0.35%/°C matches the PERC 0-400W median
  • At 22.0 kg (1.5 kg above PERC 0-400W median of 20.5 kg), requires checking roof load capacity
  • Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface

Specifications

Open datasheet PDF
Nominal power (Pmax) 320 Wp Nameplate at 1000 W/m², 25 °C
Module efficiency 18.60 % Typical Segment median 19.00%
Vmpp · Impp 34.27 V · 9.34 A Operating point at max power
Voc · Isc 40.55 V · 9.96 A Sizes the string length
Max system voltage 1500 V Longer strings than 1000 V modules
Dimensions 1711×1005×30 mm · 1.72 m² of roof
Weight 22.0 kg Weak Weak · 3.0 kg above median
Cells 120 · PERC Monocrystalline
Bifaciality 70 % Rear output as a share of front
Coefficient Pmax -0.354 %/°C Strong top 17% of its segment
Coefficient Voc · Isc -0.272 · 0.044 %/°C
NOCT 45 °C At 800 W/m², 20 °C ambient
Product warranty 12 years Hardware defects only
Performance warranty 30 years Strong top 16% · median 25 yrs
End-of-warranty output 83.0 % Equals 266 W guaranteed
Degradation 2.50 → 0.50 % First year, then annual

Simulations

Live - change any input
Lifetime output & value
30 years at 1200 kWh/kWp/year and €0.50 per kWh
Power in year 30
-
Lifetime energy
-
Energy value
-
With bifacial gain
-

Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.

Heat losses
-0.354 %/°C against a segment median of -0.360
-
Bifacial gain
Rear gain over light concrete: -
-

Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.

Filter these
Size
Panel Power Eff. Temp. Weight Difference
JA Solar JAM60D10-320/MB/1500V 320 W 18.60% -0.354 22.0 kg You are here
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.7 pp
NS-300MH-72 300 W 23.32% -0.290 12.5 kg Cooler, lighter, +4.7 pp
ZEUS 1.2 FullBlack 280W 280 W 23.31% -0.260 14.3 kg Cooler, lighter, +4.7 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +4.5 pp
NS-330MH-80 330 W 23.15% -0.290 15.0 kg Cooler, lighter, +4.5 pp
ZEUS 3.2 285WP FullBlack 285 W 23.14% -0.260 15.6 kg Cooler, lighter, +4.5 pp
GKA182M285W 285 W 23.00% - 10.8 kg -35 W, lighter, +4.4 pp
GKA182M270W 270 W 23.00% - 10.8 kg -50 W, lighter, +4.4 pp
GKA182M300W 300 W 23.00% - 16.2 kg -20 W, lighter, +4.4 pp
JAM60D10-325/MB/1500V 325 W 18.90% -0.354 22.0 kg +0.3 pp
JAM60D10-330/MB/1500V 330 W 19.20% -0.354 22.0 kg +10 W, +0.6 pp
JAM60D10-335/TB/1500V 335 W 19.50% -0.310 22.0 kg +15 W, cooler, +0.9 pp
JAM60D10-340/TB/1500V 340 W 19.80% -0.310 22.0 kg +20 W, cooler, +1.2 pp
JAM60D10-345/TB/1500V 345 W 20.10% -0.310 22.0 kg +25 W, cooler, +1.5 pp
JAM60D10-350/TB/1500V 350 W 20.40% -0.310 22.0 kg +30 W, cooler, +1.8 pp
JT440SYK(B) 440 W 22.90% -0.240 23.0 kg +120 W, cooler, +4.3 pp

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About the JAM60D10 320-345/MB/1500V Series series

6 answered

These answers cover the whole series. Where a figure differs, the specification above is this module's own.

Is the JA Solar JAM60D10 320-345/MB/1500V series still available for purchase?
The JAM60D10 320-345/MB/1500V series has been discontinued by JA Solar and is no longer actively distributed by most suppliers. Some dealers may still hold residual stock, but for new installations it is advisable to consider current JA Solar series with higher power output and ongoing manufacturer support.
What warranty does the JA Solar JAM60D10 320-345/MB series come with?
JA Solar provides a 12-year product warranty covering material and workmanship defects, along with a 30-year linear power warranty guaranteeing at least 80.7% of initial rated output after 30 years. These are standard Tier 1 manufacturer conditions, ensuring predictable long-term energy yield for residential and commercial investors.
Does the bifacial design of the JAM60D10 MB series actually generate more electricity?
Yes. Bifacial modules in the JAM60D10 MB series capture solar irradiance from both the front and the rear side, using light reflected off the ground or surrounding surfaces. Depending on surface albedo - light gravel, white roofing membrane - the rear-side energy gain ranges from 3 to 15% compared to a monofacial module of the same rated power, with the highest gains on elevated mounting structures over bright surfaces.
How do half-cut cells and multi busbar technology affect shading performance of the JAM60D10 series?
Half-cut cell design splits each cell in two, allowing the top and bottom halves of the module to operate semi-independently - shading on one section does not fully suppress output from the other. The multi busbar (MBB) layout adds extra current collection paths, reducing the impact of microcracks on power output. In practice, the module handles chimneys, antennas, and intermittent tree shadows better than conventional full-cell designs.
Are JA Solar JAM60D10 320-345/MB panels compatible with 1500 V inverters?
Yes, the series is rated for 1500 V DC systems, which allows longer strings with more modules in series. This reduces the number of parallel strings, lowers balance-of-system (BoS) cable costs, and ensures compatibility with modern string and central inverters designed for 1500 V architectures. Always verify the maximum DC input voltage of the specific inverter before configuring the string layout.
How does the JAM60D10 320-345/MB series perform at high temperatures, for example on a dark roof in summer?
The PERC cells combined with half-cut architecture deliver a power temperature coefficient of approximately -0.35%/°C. At a module operating temperature of 65°C, this translates to roughly a 17% power reduction relative to STC - slightly better than older standard-cell modules. On a pitched roof with adequate rear ventilation, real-world losses will be toward the lower end of that range.
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