Space saver, weak in heat
The Just Solar JST-EDMH-(445-465)W-TD series consists of monocrystalline modules designed to maximize energy production from limited roof or ground-mounted areas. The use of N-type TOPCon cells helps minimize losses over time and maintain high efficiency even after years of operation, which significantly improves the cost-effectiveness of the installation. The half-cell design provides stability under partial shading and reduces the risk of power drops in typical roof conditions (chimneys, skylights, antennas). Another key feature is 16BB (SMBB) technology, which improves current collection and enhances performance in practice, especially under uneven sunlight. The manufacturer emphasizes PID resistance, which makes it easier to maintain parameters in high-voltage systems. This is a good choice for installers and investors looking for panels for homes, small businesses, and commercial projects where predictable output, durability, and stable operation in challenging environments are important.
Ranking
Signals from the data
Residential, commercial and shaded-installations.
Hot climates.
Top 7% of the TOPCon 450-500 W segment, against a median of 225.2. Ranked 1,098th in the whole database.
Top 8% of the TOPCon 450-500 W segment, against a median of 52.2. Ranked 607th in the whole database.
Top 9% of the TOPCon 450-500 W segment, against a median of 22.52%. Ranked 1,017th in the whole database.
Bottom 20% of the TOPCon 450-500 W segment, against a median of -0.290.
The series delivers 22.79–23.81% module efficiency, well above direct peer comparables: Jinko/JS Solar JS182MHC120 (21.48%) and Vikram SOMERA (20.91%). The gap of up to 2.9 percentage points translates into meaningfully less roof area required to achieve the same annual energy yield.
N-type TOPCon cells exhibit first-year LID of ~0.26% vs. ~1.92% for PERC modules (Tongwei/PVEL 2024 data). Annual degradation runs ~0.40% vs. ~0.45% for PERC, compounding over a 30-year lifetime into a several-percent cumulative yield advantage for this series.
The manufacturer offers a 30-year power output warranty — longer than the 25-year standard provided by Jinko Solar and JA Solar in a comparable price tier. The 12–15-year product warranty aligns with market norms for this manufacturer category.
The 16-busbar (SMBB) layout shortens current paths and reduces series resistance, boosting the module fill factor. Halving each cell reduces working current by 50%, cutting resistive losses and limiting the impact of partial shading from chimneys, antennas, or dormers on overall string output.
The manufacturer's declared PID resistance is relevant for high-voltage DC systems (1000–1500 V DC) common with string inverters in commercial projects, where PID can cause permanent power losses of 10–30% in susceptible modules over time.
Just Solar does not appear on BloombergNEF's bankable manufacturer lists (as of Q1 2026). In practice, this restricts access to project finance for installations above ~100 kWp, where financial institutions and insurers routinely require modules from BNEF Tier-1 rated manufacturers as a condition of non-recourse lending.
The series is not bifacial (is_bifacial: false), excluding additional energy harvest from reflected rear-side irradiance (typically +5–15% for bifacial modules at albedo 0.25–0.40 on ground-mount systems). Competing TOPCon products in the 445–465 Wp class already offer bifacial variants at comparable price points.
Just Solar does not appear in the Kiwa PVEL PV Module Reliability Scorecard 2025. Given PVEL's published UVID data for TOPCon BOMs — ranging from 0.6% to 16.6% UV-induced degradation, with a 3.1% median — the absence of third-party test results for this specific series represents additional uncertainty for long-horizon investment projects.
- 23.3% module efficiency - 0.8pp better than the TOPCon 450-500W median of 22.5%
- 233.0 W/m² power density - 7.8 W/m² more than TOPCon 450-500W median (225.2 W/m²), more power per roof area
- At -0.30%/°C, hot weather performance is typical for TOPCon 450-500W panels
- 20.5 kg weight - 3.5 kg lighter than TOPCon 450-500W median (24.0 kg), reducing installation effort
- #1017 for efficiency, #6093 for temperature performance out of 14005 panels
Specifications
Simulations
Degradation from this panel's own datasheet figures. No inverter, soiling or shading losses.
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