--- title: "Exiom EX445MB-166BF 445W Solar Panel - Specs & Review | ComparePV" description: "Exiom EX445MB-166BF 445W solar panel. Specs: 20.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/exiom-ex445mb-166bf" updated: 2026-09-11 --- # Exiom EX445MB-166BF Warranty pick, heavy for its output 954 panels in the segment PERC 400-450 W ## Identity - **Manufacturer:** Exiom - **Model:** EX445MB-166BF - **Series:** EX440-455M(B)-144(HC)(166)BF - **Rated power:** 445 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 400-450 W (954 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 445 W | 410 W | Strong - top 5% | | | Module efficiency | 20.50% | 20.60% | Typical | 11,308 | | Power density | 204.7 | 206.2 | Typical | 11,478 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 27.5 kg | 22.0 kg | Weak - bottom 7% | | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.50% | 20.60% | Typical | 11,308 | | Power density | 204.7 | 206.2 | Typical | 11,478 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 61.8 | 53.0 | Weak - bottom 7% | 12,693 | | Performance warranty | 30 yrs | 25 yrs | Strong - top 17% | 21 | ### Strengths - **30 year performance warranty** - Top 17% of the PERC 400-450 W segment, against a median of 25 yrs. ### Watch out for - **61.8 kg per kWp** - Bottom 7% of the PERC 400-450 W segment, against a median of 53.0. Ranked 12,693rd in the whole database. - **Best for:** Commercial and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 445 W - **Efficiency:** 20.50 % - **Voltage at Pmax (Vmp):** 41.20 V - **Current at Pmax (Imp):** 10.81 A - **Open-circuit voltage (Voc):** 49.80 V - **Short-circuit current (Isc):** 11.37 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 - **Bifacial gain:** 30.00 ### Physical - **Length:** 2094 mm - **Width:** 1038 mm - **Weight:** 27.5 kg - **Area:** 2.17 m2 - **Power density:** 204.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11308 of 14005 | | Power density | 11478 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 12693 of 14005 | | Warranty | 21 of 14005 | ## Pros - **30-Year Power Output Warranty** - The manufacturer guarantees module performance for 30 years, compared to the industry-standard 25-year linear power warranty offered by most suppliers (JA Solar, Longi, Trina Solar). The extended linear warranty directly improves project financial models and reduces investment risk in LCOE calculations. - **Bifacial Half-Cut 144-Cell Design** - The bifacial construction harvests energy from reflected irradiance — in ground-mount systems with high-albedo surfaces (albedo >20%), bifacial gain typically reaches 5–25% additional annual yield compared to monofacial modules. The half-cut 144-cell technology further reduces resistive losses and improves tolerance to partial shading. - **Comprehensive Environmental Certification** - The series carries IEC 61730 and IEC 61215 certifications and has demonstrated resistance to salt mist, ammonia, PID, and sand/dust. This certification scope exceeds the market baseline and qualifies the modules for deployment in demanding locations such as coastal sites, agricultural environments, and desert regions. - **European-Based Manufacturer** - Exiom Solution S.A., headquartered in Spain, is one of the few European module manufacturers competing in the global market. The geographic proximity shortens the supply chain for the Polish market, simplifies warranty and service logistics, and may fulfill regional-origin requirements in public tenders that include local content clauses. ## Cons - **Efficiency ~9% Below Segment Leaders** - The series reaches a maximum efficiency of 20.9%, while direct comparables — Sunlike Solar SKT420~455M10-108D6 and IBC Solar LS-TA2 — achieve 22.8%. On an identical 100 m² installation footprint, this translates to approximately 9% less energy generated. Only the Waaree ARKA SERIES (20.93%) remains at a comparable efficiency level. - **PERC Technology in the TOPCon Era** - In 2024, TOPCon accounted for over 66% of global module shipments by manufacturing capacity, while PERC's market share fell to approximately 35–40%. PERC cells exhibit a higher annual degradation rate (0.6–0.8%/yr vs. 0.4–0.5%/yr for TOPCon) and greater first-year LID losses (~2% vs. ~1%), resulting in lower total lifetime energy yield over a 30-year operating period despite the extended power warranty. - **No Bankable Tier-1 Status (BNEF)** - Manufacturer data indicates the absence of a current Bloomberg NEF bankable Tier-1 classification. This may complicate securing project finance for installations above 1 MWp, where lenders typically require modules from certified Tier-1 suppliers as a condition for non-recourse debt. ## About this series The Exiom EX440-455M(B)-144(HC)(166)BF panel series is an advanced solution based on **Bifacial technology**, which allows for energy generation not only from direct sunlight but also from reflected light falling on the rear side of the module. Thanks to the use of **Half-Cut cells and a 144-cell design**, these modules exhibit significantly lower resistance losses and higher resistance to the negative effects of partial shading, which directly translates into stable energy production in variable weather conditions. This solution is ideal for investors seeking maximum efficiency from a given area, especially in ground-mounted installations and on flat roofs with a high light reflection coefficient. The robust construction and tempered glass provide exceptional **resistance to mechanical loads**, protecting the system against extreme wind or accumulating snow. This series stands out from the competition with an excellent balance between innovative 166-millimeter cell technology and durability, making it an optimal choice for **large-scale commercial projects** and modern photovoltaic farms. Choosing these modules minimizes the risk of potential-induced degradation and guarantees long-term investment efficiency while maintaining rigorous quality standards. ## Notable figures - At 20.5% efficiency, this panel is on par with typical \*\*PERC 400-450W\*\* modules - At 204.7 W/m² power density, roof space requirements are typical for \*\*PERC 400-450W\*\* panels - At -0.35%/°C, hot weather performance is typical for \*\*PERC 400-450W\*\* panels - Weight of 27.5 kg is 5.5 kg above \*\*PERC 400-450W\*\* median (22.0 kg) - verify structural support - Bifaciality factor of 70% can add 4-10% extra yield with reflective mounting surface ## Questions ### What power output and efficiency do the Exiom EX440-455M(B)-144(HC)(166)BF panels achieve? The top model in the series reaches a peak power output of 455 Wp. By utilizing 144 PERC Half-Cut cells with a 166 mm cell format, the modules deliver high energy conversion efficiency typical of this class of monocrystalline cells. The smaller Half-Cut cell design reduces resistive losses, resulting in real-world energy yield that closely matches nameplate values even under slight shading conditions. ### How does Bifacial technology work in the Exiom EX440-455M(B)-144(HC)(166)BF series, and is the price premium justified? Bifacial technology means the panel generates electricity from both its front and rear surfaces — the rear glass captures light reflected from the ground surface (albedo effect). In ground-mounted installations over light-colored gravel or snow, and on flat roofs with white membranes, the additional energy yield can reach 5–15% compared to a monofacial module. If your installation is designed for such conditions, the price premium for bifacial modules is typically recovered quickly through increased energy production. ### What warranty coverage applies to the Exiom EX440-455M(B)-144(HC)(166)BF series panels? The manufacturer provides a 25-year product warranty covering material defects and workmanship, along with an industry-leading 30-year linear power output warranty. This means that over a 30-year period, the manufacturer guarantees a gradual, controlled degradation in performance in accordance with a linear curve. This is one of the longest power warranties available on the market today, making it particularly relevant when calculating the return on investment for a PV installation. ### Are the Exiom EX440-455M(B)-144(HC)(166)BF panels suitable for pitched roofs, or do they perform better in ground-mounted installations? The series performs well in both applications; however, its full potential is best realized in ground-mounted and flat-roof installations. These are precisely the configurations where Bifacial technology delivers the greatest energy gains from ground-reflected light. On a pitched roof, the bifacial effect is still present, but the rear surface of the module is partially obstructed by the mounting structure, which limits the additional yield to only a few percentage points. ### Is the Exiom EX440-455M(B)-144(HC)(166)BF series resistant to partial shading from obstructions such as a chimney or antenna? Yes. The Half-Cut cell architecture splits each cell into two halves, which significantly reduces the impact of partial shading on the rest of the module. Even if a chimney or antenna shades a few cells, the remaining portion of the panel and other modules in the string continue to operate efficiently. This is a notable advantage over conventional full-size cell designs, where a single shaded cell can substantially curtail the output of the entire string. ### Is Exiom a proven manufacturer — what is their track record and where are they based? Exiom Solution S.A. is a manufacturer headquartered in Asturias, Spain, operating since 2009 and exporting panels to more than 40 countries. The company owns its production facilities and is collaborating with Iberdrola on the development of a cell manufacturing plant in Spain. While Exiom may not appear on every Tier 1 ranking, it is a well-regarded supplier with rigorous quality control processes and full product documentation meeting the requirements of European installers. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/EX440-455MB-144HC166BF-67e8aa8c3c69.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +4.3 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | Cooler, lighter, +4.0 pp | | [Suntech STP-NT11/48QGSF-490](https://comparepv.com/panel/suntech-stp-nt11-48qgsf-490) | 490 W | Cooler, lighter, +4.0 pp | | [JA Solar JAT54S40-485/LR](https://comparepv.com/panel/ja-solar-jat54s40-485-lr) | 485 W | Cooler, lighter, +3.8 pp | | [AIKO AIKO-A485-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a485-mce54mw) | 485 W | Cooler, lighter, +3.8 pp | | [Longi Solar LR7-54HJD-495M](https://comparepv.com/panel/longi-lr7-54hjd-495m) | 495 W | +50 W, cooler, +3.8 pp | | [AIKO AIKO-A485-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a485-mah54mw) | 485 W | Cooler, lighter, +3.8 pp | | [Exiom EX440MB-166BF](https://comparepv.com/panel/exiom-ex440mb-166bf) | 440 W | -0.3 pp | | [Exiom EX450MB-144BF](https://comparepv.com/panel/exiom-ex450mb-144bf) | 450 W | Very close match | | [Exiom EX455MB-144BF](https://comparepv.com/panel/exiom-ex455mb-144bf) | 455 W | +10 W, +0.4 pp | | [Gamko New Energy GKA120N-PRO-590W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-590w) | 590 W | +145 W, cooler, +3.3 pp | | [Gamko New Energy GKA120N-PRO-585W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-585w) | 585 W | +140 W, cooler, +3.1 pp | | [Bisol BGO 580](https://comparepv.com/panel/bisol-bgo-580) | 580 W | +135 W, cooler, +3.0 pp | | [Gamko New Energy GKA120N-PRO-580W](https://comparepv.com/panel/gamko-new-energy-gka120n-pro-580w) | 580 W | +135 W, cooler, +2.9 pp | --- Source: https://comparepv.com/panel/exiom-ex445mb-166bf 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.