Middle of its segment, weak in heat
The JA Solar M2 series consists of modules designed for high energy yield in real-world conditions, where factors such as shading, different mounting angles, and limited roof space are important. The use of half-cut technology reduces internal losses and helps maintain stable performance even when part of the panel is exposed to less light. Monocrystalline PERC cells and multi-busbar connections (MBB) support efficient current collection and minimize the impact of micro-cracks on long-term performance.
In practice, the M2 series solves common problems associated with residential and commercial solar installations - it improves tolerance to shading, simplifies string design, and provides predictable yields during transitional seasons. It is a good choice for single-family homes, small businesses, and rooftop installations with limited load-bearing capacity, where a lightweight design and simpler installation are important. Compared to the competition, the series stands out due to its consistent 182 mm platform, which is meticulously designed for durability and stability over time.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Hot climates.
Bottom 16% of the PERC 350-400 W segment, against a median of -0.350.
Splitting cells in half reduces internal resistive losses by approximately 50%, while multi-busbar (MBB) interconnects lower the impact of microcracks and improve partial-shading tolerance. In practice, this results in more stable string output under the non-uniform irradiance typical of pitched rooftops.
JA Solar is listed on the BNEF Tier-1 Q1 2026 ranking with annual production capacity exceeding 80 GW. Tier-1 bankable status means that lenders accept these modules as project collateral and that the 25-year linear power warranty is backed by the manufacturer's verified financial standing.
A broad power range allows system designers to match module output to varying roof sizes and load requirements without accepting oversized wattage bins, and enables precise string sizing to minimize MPPT balancing losses.
Peak efficiency of 21.2% ties with MY Solar M2 (21.2%) and exceeds both Solarwatt Panel vision GM 3.0 pure (20.7%) and KB Solar KBS-MONO-BF (20.9%) from the peer-comparable set - placing this P-type PERC series at the top of the reference group.
The M2 series went end-of-life around 2021. This eliminates access to replacement modules for warranty claims, creates a visual and electrical mismatch risk if the array is later expanded, and limits ongoing technical support - a material operational risk for installations expected to run 25+ years.
P-type PERC cells carry a temperature coefficient of Pmax ≈ -0.35%/°C versus -0.30%/°C for TOPCon modules, which captured roughly 65% of global production in 2024. Annual PERC degradation runs 0.45-0.55% versus 0.30-0.40% for TOPCon; over the 25-year warranty horizon, the cumulative energy yield gap can reach 3-7 percentage points in favor of modern TOPCon alternatives.
- Efficiency of 19.8% matches the PERC 0-400W median
- 198.4 W/m² power density - 4.0 W/m² more than PERC 0-400W median (194.4 W/m²), more power per roof area
- Temperature coefficient of -0.37%/°C matches the PERC 0-400W median
- Weight of 22.5 kg is 2.0 kg above PERC 0-400W median (20.5 kg) - verify structural support
- In the top 89% for efficiency among all PERC panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
Found 144 panels of the same or similar size to this one, within ±10 mm. See them here Found 232 panels of the same or similar size to this one, within ±25 mm. See them here Found 351 panels of the same or similar size to this one, within ±50 mm. See them here Found 550 panels of the same or similar size to this one, within ±100 mm. See them here
About the M2 series series
These answers cover the whole series. Where a figure differs, the specification above is this module's own.