Warranty pick, heavy for its output
This series of JA Solar JAM78D10 435-455/MB/1500V modules is designed for installations where stable energy production in varying conditions and high mechanical strength are crucial. The application of double glass construction effectively minimizes the risk of accelerated degradation and better protects the cells against moisture and micro-cracking, which is essential for industrial roofs and PV farms. The modules feature monocrystalline cells in a half-cut configuration, enabling more efficient operation under partial shading and lower internal losses. An additional advantage is compatibility with 1500V systems, facilitating longer string designs and optimal BOS balance in large-scale installations. In practice, this series addresses common investor challenges: yield drops in hot weather, risk of transport damage, and requirements for long-term operation. It is an excellent choice for EPC contractors, solar farm developers, and companies prioritizing predictable energy yields and module longevity throughout the project lifecycle.
Ranking
Signals from the data
Commercial and shaded-installations.
Weight-limited structures, tight roof space and roofs where every square metre has to count.
Top 17% of the PERC 400-450 W segment, against a median of 25 yrs.
Bottom 2% of the PERC 400-450 W segment, against a median of 53.0. Ranked 13,160th in the whole database.
Bottom 16% of the PERC 400-450 W segment, against a median of 20.60%.
Bottom 18% of the PERC 400-450 W segment, against a median of 206.2.
Dual glass eliminates the rear EVA backsheet, reducing moisture ingress to <0.5 g/m²·d (IEC 61215), slowing degradation and improving mechanical protection - critical for industrial rooftop and utility-scale PV farms with long operational cycles.
Half-cut layout (156 cells vs. 78 in full-cell) reduces resistive losses by ~50%, while the 70%±10% bifaciality factor enables additional yield from reflected irradiance. Under optimal conditions (light-colored surface, adequate ground clearance), real-world energy gain can reach 10-20% over monofacial modules.
A maximum system voltage of 1500V DC (IEC) allows strings of up to 28-30 modules per MPPT tracker, directly reducing BoS costs (cabling, combiner boxes, inverters) in utility-scale and large commercial PV projects.
JA Solar (founded 2005) consistently appears on the Bloomberg NEF Tier-1 list and ranks in the global top-5 PV manufacturers. Bankable status ensures warranty enforceability and is a prerequisite for project finance acceptance by most lending institutions.
The manufacturer guarantees ≥83% of rated power after 30 years, implying annual degradation ≤0.55% - a competitive long-term commitment relevant to LCOE calculations in projects with extended investment horizons.
The JAM78D10 435-455/MB series went out of production circa 2022. Module availability is limited to distributor stock, and sourcing replacement units for long-term O&M may prove difficult or impossible over the project's full operational life.
Module efficiency of 19.7-20.6% (PERC) lags significantly behind comparable series: Sunlike Solar SKT420~455M10-108D6 reaches 22.8%, IBC Module Transparent LS-TA2 achieves 22.8%, and Waaree ARKA SERIES hits 20.93%. The 2+ percentage-point gap translates to approximately 10% more roof or land area required for equivalent installed capacity.
PERC cells carry a Pmax temperature coefficient of approximately -0.35%/°C. Modern TOPCon modules achieve -0.30 to -0.31%/°C, yielding roughly 1.5-2% higher output on hot days (Tc=65°C). PERC also exhibits higher Light-Induced Degradation (LID) in the first year of operation compared to N-type technologies.
The workmanship warranty covers only 12 years, whereas JA Solar's current Deep Blue 4.0 lineup and most 2023-2024 peer comparables offer 25-year product warranties. For projects with a 20-30 year operational horizon, this gap may negatively impact insurability and lender acceptance during project finance due diligence.
- At 20.1% efficiency, this panel is on par with typical PERC 400-450W modules
- Power density of 201.4 W/m² is 4.8 W/m² below PERC 400-450W median (206.2 W/m²) - needs more roof space
- Temperature coefficient of -0.35%/°C matches the PERC 400-450W median
- At 29.0 kg, this panel is 7.0 kg heavier than the PERC 400-450W median (22.0 kg) - more demanding for installation crews
- Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Model: bifaciality × albedo × 0.6 view factor. A first-order estimate, not a yield simulation.
Found 6 panels of the same or similar size to this one, within ±10 mm. See them here Found 12 panels of the same or similar size to this one, within ±25 mm. See them here Found 26 panels of the same or similar size to this one, within ±50 mm. See them here Found 227 panels of the same or similar size to this one, within ±100 mm. See them here
About the JAM78D10 435-455/MB/1500V Series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.