--- title: "Exiom EX455MB-144BF 455W Solar Panel - Specs & Review | ComparePV" description: "Exiom EX455MB-144BF 455W solar panel. Specs: 20.90% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/exiom-ex455mb-144bf" updated: 2026-09-11 --- # Exiom EX455MB-144BF Warranty pick, heavy for its output 449 panels in the segment PERC 450-500 W ## Identity - **Manufacturer:** Exiom - **Model:** EX455MB-144BF - **Series:** EX440-455M(B)-144(HC)(166\*83 BIFACIAL) - **Rated power:** 455 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 450-500 W (449 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 455 W | 460 W | Typical | | | Module efficiency | 20.90% | 20.82% | Typical | 10,072 | | Power density | 209.3 | 208.5 | Typical | 9,969 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 27.5 kg | 24.5 kg | Weak - bottom 7% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.90% | 20.82% | Typical | 10,072 | | Power density | 209.3 | 208.5 | Typical | 9,969 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 60.4 | 53.1 | Weak - bottom 7% | 12,459 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 20% | 21 | ### Strengths - **30 year performance warranty** - Top 20% of the PERC 450-500 W segment, against a median of 25 yrs. ### Watch out for - **60.4 kg per kWp** - Bottom 7% of the PERC 450-500 W segment, against a median of 53.1. Ranked 12,459th in the whole database. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 455 W - **Efficiency:** 20.90 % - **Voltage at Pmax (Vmp):** 41.60 V - **Current at Pmax (Imp):** 10.94 A - **Open-circuit voltage (Voc):** 50.20 V - **Short-circuit current (Isc):** 11.51 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 41 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 - **Bifacial:** yes ### Physical - **Length:** 2094 mm - **Width:** 1038 mm - **Weight:** 27.5 kg - **Area:** 2.17 m2 - **Power density:** 209.3 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 80.0 % - **First-year degradation:** 2.50 % - **Annual degradation:** 0.60 % - **Output after 30 years:** 364 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 10072 of 14005 | | Power density | 9969 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 12459 of 14005 | | Warranty | 21 of 14005 | ## Pros - **Bifacial Technology – Real-World Albedo Gains** - Modules generate power from both sides of the cell. In ground-mount installations over light-colored surfaces, or flat rooftops with white membranes, the bifaciality factor typical of PERC (~70%) translates to an additional 8–15% annual energy yield compared to monofacial modules of the same nominal power rating. - **Half-Cut 144-Cell Design – Shade Resilience** - Splitting 72 full cells into 144 half-cut cells reduces internal resistance and mitigates hot-spot formation. Under partial shading conditions, string-level power losses are up to 30–50% lower than in conventional full-cell modules — a significant advantage on Polish rooftops with obstructions such as chimneys and antennas. - **30-Year Linear Power Warranty** - Exiom offers a 30-year linear power warranty backed by a 25-year product warranty. Peer comparables in this segment — Waaree ARKA and Sunlike Solar SKT — standard offer 25-year power warranties, giving this series a 5-year advantage and extending the bankable financing horizon for project developers. - **Up to 20.9% Efficiency – On Par with Waaree ARKA** - The peak module efficiency of 20.9% is virtually identical to the Waaree ARKA Series (20.93%), positioning this series at the top of the PERC bifacial 455 Wp segment for the 2020–2023 production vintage. - **Multi-Busbar – Reduced Resistive Losses** - Multi-busbar technology shortens current flow paths and reduces resistive losses, delivering measurably higher daily energy yield compared to legacy 9BB or standard busbar configurations under irradiance levels above 800 W/m². ## Cons - **Discontinued Series (2020–2023)** - Production of the EX440-455M(B)-144 ended in 2023. Availability of new modules is limited exclusively to distributor warehouse stock, making it impossible to source identical panels for future system expansions and potentially extending warranty claim lead times. - **Low Efficiency vs. Competitors in the 455 Wp Segment** - The series peaks at 20.9% efficiency, while the Sunlike Solar SKT420~455M10-108D6 and IBC Solar LS-TA2 455 achieve 22.8% — a 1.9 percentage-point gap meaning a competing installation of the same area will produce approximately 9% more energy annually. - **P-Type PERC Technology – Higher LID and Lower Bifaciality** - PERC cells exhibit light-induced degradation (LID) of approximately 2% in the first year of operation (vs. ~1% for N-type TOPCon) and a bifaciality factor of ~70% (vs. >80% for TOPCon). The market shifted en masse to N-type modules in 2023, rendering this series technologically outdated even relative to its current market price. - **Obsolete 166 mm Cell Format (M6)** - The industry abandoned the 166 mm format in favor of M10 (182 mm) and G12 (210 mm) between 2022 and 2023. M6-based systems have limited compatibility with modern power optimizers and microinverters designed for larger cell formats. ## About this series Modules from the Exiom EX440-455M(B)-144(HC) series are an advanced solution based on **bifacial technology**, which allows for active energy generation from both sides of the cell. By utilizing light reflected from the ground, these panels significantly increase the total energy yield, which is crucial in professional ground-mounted installations and on flat roofs covered with a bright membrane. The use of **Half-Cut cells** effectively minimizes power losses on internal connections and drastically limits the negative impact of partial shading on the operation of the entire system. The design utilizing 144 smaller monocrystalline cells guarantees excellent thermal stability, eliminating the risk of damage associated with the formation of harmful hot-spots. This series is dedicated to investors focused on maximizing profitability from a given area, especially in the variable weather conditions typical of the Polish climate. **High resistance to mechanical loads** and slow linear degradation ensure that these modules provide stable and predictable production for decades. The use of **Multi-Busbar technology** additionally shortens the path of current flow, which directly translates into higher efficiency in full sun. It is an optimal choice for photovoltaic farms and commercial systems, where the priority is to utilize the albedo effect to radically accelerate the return on investment. ## Notable figures - At 20.9% efficiency, this panel is on par with typical \*\*PERC 450-500W\*\* modules - Power density of 209.3 W/m² matches the \*\*PERC 450-500W\*\* median - Temperature coefficient of -0.35%/°C matches the \*\*PERC 450-500W\*\* median - Weight of 27.5 kg is 3.0 kg above \*\*PERC 450-500W\*\* median (24.5 kg) - verify structural support - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### Is the Exiom EX440-455M(B)-144(HC) series still available for purchase? The EX440-455M(B)-144(HC) series has been discontinued and is no longer offered by the manufacturer as a current model. Limited inventory may still exist with some distributors, though availability is uncertain. If you are planning a new installation, it is advisable to consider newer Exiom modules based on TOPCon technology, which offer higher efficiency and full manufacturer warranty support. ### How does bifacial technology work in the Exiom EX455M panels, and does it actually generate more energy? Yes, the bifacial panels in the EX440-455M series generate electricity from both sides of the cell. The front side captures direct solar irradiance, while the rear side harvests albedo light reflected from the underlying surface. Under optimal conditions — such as above a light-colored roofing membrane or gravel — the gain can reach 5–15% above the rated output of 455 Wp. The effect is most pronounced in ground-mounted systems with adequate clearance beneath the modules. ### What warranty coverage applies to the Exiom EX440-455M(B)-144(HC) modules? The manufacturer provides a 25-year product warranty covering material and workmanship defects, along with a 30-year linear power output warranty guaranteeing at least 80% of nominal rated power throughout that period. However, since the series has been discontinued, it is important to verify before purchase that your chosen distributor is able to process and enforce warranty claims on your behalf. ### What advantages do half-cut cells offer in the EX440-455M series, and does it matter for partial shading? Half-cut cells are physically bisected, which shortens the current path and reduces internal resistance. In practice, this results in lower resistive losses at elevated operating temperatures and significantly improved tolerance to partial shading — for example, from a chimney or antenna. If any portion of an installation is shaded for periods of time, half-cut cell modules limit the power drop across the entire string compared to conventional full-size cells. ### What is the efficiency of the Exiom EX455M panels, and is it a competitive figure? Modules in this series achieve efficiencies in the range of 20.2–20.9%, depending on the power class. For bifacial PERC technology at the time of the product's market launch, this was an excellent result. Today, newer TOPCon cells routinely exceed 22%, so the EX440-455M series is comparable to top-tier PERC modules but does not match the latest generation of panels available on the market in 2025. ### Are the Exiom EX440-455M panels suitable for ground-mounted installations in the Polish climate? Yes, the bifacial construction and a power temperature coefficient of -0.35%/°C make this series well suited to the variable conditions of the Polish climate. Ground-mounted systems allow full utilization of the rear-side albedo effect. High resistance to mechanical loads from snow and wind confirms the series' suitability for year-round outdoor exposure. The series was specifically designed for commercial and utility-scale ground-mount applications. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/EX440-455MB-144HC166-83_Bifacial-f3960d05434a.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.9 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +50 W, cooler, +3.8 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +3.6 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +45 W, cooler, +3.6 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | Cooler, lighter, +3.6 pp | | [Gokin GK-3-54HGb-500M](https://comparepv.com/panel/gokin-gk-3-54hgb-500m) | 500 W | Cooler, lighter, +3.6 pp | | [Exiom EX440MB-166BF](https://comparepv.com/panel/exiom-ex440mb-166bf) | 440 W | -15 W, -0.7 pp | | [Exiom EX445MB-166BF](https://comparepv.com/panel/exiom-ex445mb-166bf) | 445 W | -10 W, -0.4 pp | | [Exiom EX450MB-144BF](https://comparepv.com/panel/exiom-ex450mb-144bf) | 450 W | Very close match | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +135 W, cooler, +2.9 pp | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +130 W, cooler, +2.7 pp | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +125 W, cooler, +2.6 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +125 W, cooler, +2.5 pp | --- Source: https://comparepv.com/panel/exiom-ex455mb-144bf Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.