JST355M(120)

Bottom 9% of the Back Contact 255-455 W segment, against a median of 48.7. Ranked 7,492nd in the whole database.

Bottom 10% of the Back Contact 255-455 W segment, against a median of 22.30%.

Bottom 10% of the Back Contact 255-455 W segment, against a median of 222.8.

Moving all busbars to the rear of the cell eliminates front-side shading losses that typically account for 2–3% power reduction in standard PERC modules. The IBC architecture delivers higher energy yield under diffuse irradiance and partial shading conditions common in Central European climates.

IBC n-type cells achieve a temperature coefficient of approximately -0.29%/°C versus -0.34%/°C for standard PERC modules. At a rooftop cell temperature of 65°C, this translates to roughly 1.5 percentage points less power loss compared to older-generation technology.

The series' efficiency range is competitive within the premium segment: the 22.1% peak sits close to directly comparable TOPCon models (Lina Energy Nexa: 22.26%, SunLink SL5N108: 22.3%, SunKean SKT435: 22.27%), while retaining the system-level advantages inherent to the back-contact architecture.

The absence of metallic busbars on the front face gives these modules a uniform black appearance valued by BIPV designers and residential customers seeking visual integration. The full-black finish satisfies increasingly common HOA guidelines and architectural approval requirements.

The manufacturer provides a 25-year linear power output warranty, consistent with the premium-segment market standard, ensuring predictable LCOE calculations across the full intended operational lifespan of a residential or prosumer installation.

The IBC Mono Module series carries a discontinued status, meaning no new production runs, severely limited availability of matching replacement panels (critical for single-module failure scenarios), and risk of the manufacturer withdrawing technical support once distributor inventory is exhausted.

Just Solar does not appear on the BloombergNEF Tier-1 bankable manufacturer list (Q1 2026). This creates obstacles for project-finance arrangements with commercial banks and may complicate insurance underwriting for larger installations. While the peer comparables in this segment are similarly non-Tier-1, institutional and C&I buyers increasingly require bankability as a baseline.

The product (materials & workmanship) warranty stands at 10 years, below the 12–15 years now offered by leading Tier-1 manufacturers such as Jinko Solar (Tiger Neo) and LONGi (Hi-MO 6). The shorter coverage window increases financial exposure to replacement costs during the mid-life phase of the installation (years 10–15).

At an identical peak power of 435 Wp, the series' maximum module efficiency of 22.1% lags direct competitors: SunLink SL5N108 at 22.3%, SunKean SKT435 at 22.27%, and Lina Energy Nexa at 22.26%. The 0.16–0.20 percentage-point gap means roughly 1% more roof area is required to achieve an equivalent annual energy yield.