--- title: "Axitec AC-545MBT/144V 545W Solar Panel - Specs & Review | ComparePV" description: "Axitec AC-545MBT/144V 545W solar panel. Specs: 21.09% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/axitec-ac-545mbt-144v" updated: 2026-09-11 --- # Axitec AC-545MBT/144V Space saver, short guarantee 706 panels in the segment PERC 500-550 W ## Identity - **Manufacturer:** Axitec - **Model:** AC-545MBT/144V - **Series:** AXIbipremium XXL HC MT - **Rated power:** 545 W - **Cell technology:** PERC - **Bifacial:** yes ## How it compares Compared against segment PERC 500-550 W (706 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 545 W | 535 W | Strong - top 12% | | | Module efficiency | 21.09% | 20.90% | Typical | 9,519 | | Power density | 211.0 | 209.0 | Strong - top 18% | 9,312 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight (kg) | 28.5 kg | 28.4 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 23% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.09% | 20.90% | Typical | 9,519 | | Power density | 211.0 | 209.0 | Strong - top 18% | 9,312 | | Temperature coefficient | -0.350 | -0.350 | Typical | 10,419 | | Weight per kWp | 52.3 | 53.0 | Typical | 5,761 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 23% | 9,798 | ### Strengths - **211.0 watts per square metre** - Top 18% of the PERC 500-550 W segment, against a median of 209.0. ### Watch out for - **25 year performance warranty** - Bottom 23% of the PERC 500-550 W segment, against a median of 30 yrs. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 545 W - **Efficiency:** 21.09 % - **Voltage at Pmax (Vmp):** 41.80 V - **Current at Pmax (Imp):** 13.04 A - **Open-circuit voltage (Voc):** 49.75 V - **Short-circuit current (Isc):** 13.93 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.350 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** PERC - **Cell count:** 144 - **Bifacial:** yes - **Bifacial gain:** 25.00 ### Physical - **Length:** 2278 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 28.5 kg - **Area:** 2.58 m2 - **Power density:** 211.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 85.0 % - **First-year degradation:** 3.00 % - **Annual degradation:** 0.50 % - **Output after 30 years:** 450 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9519 of 14005 | | Power density | 9312 of 14005 | | Temperature coefficient | 10419 of 14005 | | Weight | 5761 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **N-type TOPCon – Lower Degradation and Superior Temperature Coefficient** - N-type TOPCon cells deliver a Pmax temperature coefficient of approximately -0.30%/°C and an annual degradation rate of ~0.4%/year, compared to ~0.35%/°C and ~0.55%/year for PERC technology. In the Polish climate — characterized by cool mornings and variable irradiance — this difference translates into a measurable increase in annual energy yield of several percentage points over the full system lifetime. - **Bifacial: Up to +25% Energy Gain from the Rear Side** - The bifacial module design harvests additional energy from albedo-reflected irradiance on the rear surface. With typical ground albedo values for light gravel or snow cover, the real-world annual yield gain is 5–15%, directly reducing the LCOE of ground-mount and carport installations without requiring additional modules. - **Efficiency Up to 21.48% – Leading Among Peer Comparables** - A peak efficiency of 21.48% positions this series above ET Solar Elite PLUS (21.4%) and Boviet VEGA (21.3%), and at virtual parity with JA Solar DEEP BLUE 3.0 (21.5%). In the XXL format (144 cells, Pmax 555 Wp), this translates into a smaller roof or land footprint for the same installed capacity, lowering balance-of-system (BoS) costs per installed MW. - **Half-Cut 144-Cell Design + Multi-Busbar** - Splitting cells in half reduces internal I²R resistive losses by ~75% compared to full cells, and partial shading on one half of the module does not disable the entire string. The multi-busbar (MBB) configuration shortens current path lengths and improves cell resistance to microcracks — a critical advantage for XXL-format modules exposed to snow and wind loads in Polish conditions. - **15-Year Product Warranty and 25-Year Power Guarantee** - The 15-year product warranty exceeds that of certain competitors in this segment — for example, JA Solar DEEP BLUE 3.0 offers a 12-year product warranty per ENF/SolarReviews. The 25-year linear power output guarantee provides cash flow predictability for utility-scale PV projects with a typical financing horizon of 20–25 years. ## Cons - **No BNEF Tier-1 Status – Bankability Risk** - Axitec does not appear on the BloombergNEF Bankable Module Makers list (tier\_1\_bankable: false). For non-recourse-financed utility-scale PV projects, lenders and financial institutions routinely require modules from BNEF Tier-1 manufacturers. This creates potential financing barriers or the need for additional credit enhancements on projects above 1 MWp, where competitors such as JA Solar — a Tier-1 manufacturer — hold a structural advantage. - **Launched in 2021 – No Documented Next-Generation Iteration** - The AXIbipremium XXL HC MT series has been on the market since 2021 without a documented product refresh. Between 2024 and 2026, leading TOPCon manufacturers such as Jinko Tiger Neo and LONGi Hi-MO 9 have introduced modules achieving 22–23% efficiency and Pmax above 600 Wp at comparable price points. When planning long-term utility-scale farms, this series should be benchmarked against the latest market offerings before a final procurement decision is made. ## About this series The Axitec AXIbipremium XXL HC MT series is an advanced solution for demanding investors who prioritize maximum energy efficiency. The key distinguishing feature of these modules is **bifacial technology**, which enables the generation of additional energy from reflected radiation, which, combined with the large XXL format, allows for record-breaking yields from every square meter of surface area. Thanks to the use of an innovative **Half-Cut design**, these panels effectively eliminate the problem of performance drops in partial shading conditions, which is crucial for the stability of system operation in Polish weather conditions. The use of the **Multi-Busbar** system shortens the electron flow path and strengthens the cells' resistance to mechanical loads, which drastically extends the lifespan of the entire installation. This series is primarily dedicated to large-scale farms and industrial facilities where the lowest levelized cost of energy matters. Compared to the competition, this product stands out for its **exceptional resistance to degradation** and precise matching of components, which guarantees trouble-free operation for many years. By choosing AXIbipremium XXL HC MT, you gain investment certainty based on solid German engineering, which realistically translates into a faster return on investment and higher profits from electricity production. ## Notable figures - Efficiency of 21.1% matches the \*\*PERC 500-550W\*\* median - Power density of 211.0 W/m² matches the \*\*PERC 500-550W\*\* median - At -0.35%/°C, hot weather performance is typical for \*\*PERC 500-550W\*\* panels - 70% bifaciality enables rear-side power generation, boosting yield by 4-10% on reflective surfaces - Ranked #9519 out of 14005 panels for efficiency in the database ## Questions ### What warranty is provided for Axitec AXIbipremium XXL HC MT panels? The AXIbipremium XXL HC MT series is covered by a 15-year product warranty against material and workmanship defects, as well as a 25-year linear power output warranty. This means the manufacturer guarantees a specified minimum energy yield for a quarter of a century. The warranty is issued by Axitec Energy GmbH & Co. KG, headquartered in Böblingen, Germany, providing additional assurance regarding enforceability. ### What is TOPCon technology and why was it adopted in the AXIbipremium XXL HC MT series? TOPCon (Tunnel Oxide Passivated Contact) is a next-generation cell technology succeeding PERC, characterized by higher conversion efficiency and reduced thermal degradation. In the AXIbipremium XXL HC MT series, this translates into improved energy yields under Polish climatic conditions, where panel temperatures can exceed 60°C during summer months. Thanks to TOPCon, a given installation produces more energy from the same roof or ground area compared to older technologies. ### How much additional energy does the bifacial design of the AXIbipremium XXL HC MT panels provide? Bifacial technology allows the rear side of the panel to absorb reflected irradiance from the ground surface (albedo). In practice, with a high-reflectivity substrate such as gravel, a light-colored membrane, or snow, the additional energy gain ranges from 5% to 15% per year compared to a monofacial module of the same front-side rated power of 555 Wp. The best results are achieved in ground-mounted installations with adequate clearance beneath the modules. ### Are Axitec AXIbipremium XXL HC MT panels suitable for installation on a single-family residential rooftop? The XXL series consists of large-format modules rated up to 555 Wp, designed primarily for utility-scale PV farms and industrial facilities. For a typical pitched residential rooftop, these modules may present logistical and installation challenges due to their physical dimensions and weight. For residential installations, smaller Axitec modules are worth considering, while the AXIbipremium XXL HC MT is ideally suited for flat roofs on warehouses and commercial buildings. ### How does the Half-Cut cell technology in the AXIbipremium XXL HC MT series affect performance under partial shading? The Half-Cut construction splits each cell in two, resulting in a module composed of 144 smaller cells instead of 72 standard ones. As a result, shading of a portion of the panel — for example by a chimney, antenna, or nearby trees — reduces the output of only half the module rather than the entire unit, as would occur with conventional full cells. Combined with a Multi-Busbar system that shortens current flow paths, the AXIbipremium XXL HC MT series maintains high production stability even under non-ideal irradiance conditions. ### Is Axitec a Tier 1 manufacturer, and can it be trusted when purchasing AXIbipremium XXL HC MT panels? Axitec does not currently appear on the Tier 1 lists published by BloombergNEF; however, it is a well-established European manufacturer with over a decade of experience and headquarters in Germany. The company offers robust warranty terms — 15 years for product defects and 25 years for power output — and its panels hold IEC and MCS certifications. The absence of Tier 1 status is primarily a function of production volume rather than module quality. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DB_144zlg_bipremium_XXL_HC_MT_MiA_IN-a590303eebfc.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | Cooler, lighter, +3.9 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | Cooler, lighter, +3.7 pp | | [Longi Solar LR7-60HVH-560M](https://comparepv.com/panel/longi-lr7-60hvh-560m) | 560 W | Cooler, +3.7 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | Cooler, lighter, +3.6 pp | | [Longi Solar LR7-60HVH-555M](https://comparepv.com/panel/longi-lr7-60hvh-555m) | 555 W | Cooler, +3.5 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | Cooler, lighter, +3.4 pp | | [Axitec AC-530MBT/144V](https://comparepv.com/panel/axitec-ac-530mbt-144v) | 530 W | -15 W, -0.6 pp | | [Axitec AC-535MBT/144V](https://comparepv.com/panel/axitec-ac-535mbt-144v) | 535 W | -10 W, -0.4 pp | | [Axitec AC-540MBT/144V](https://comparepv.com/panel/axitec-ac-540mbt-144v) | 540 W | Very close match | | [Axitec AC-550MBT/144V](https://comparepv.com/panel/axitec-ac-550mbt-144v) | 550 W | Very close match | | [Axitec AC-555MBT/144V](https://comparepv.com/panel/axitec-ac-555mbt-144v) | 555 W | +10 W, +0.4 pp | | [Axitec AC-570TGB/144TS](https://comparepv.com/panel/axitec-ac-570tgb-144ts) | 570 W | Cooler, +1.0 pp, +5 yr warranty | | [Axitec AC-575TGB/144TS](https://comparepv.com/panel/axitec-ac-575tgb-144ts) | 575 W | Cooler, +1.2 pp, +5 yr warranty | | [Axitec AC-580TGB/144TS](https://comparepv.com/panel/axitec-ac-580tgb-144ts) | 580 W | Cooler, +1.4 pp, +5 yr warranty | | [Axitec AC-585TGB/144TS](https://comparepv.com/panel/axitec-ac-585tgb-144ts) | 585 W | +40 W, +1.6 pp, +5 yr warranty | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | +105 W, cooler, +4.1 pp | --- Source: https://comparepv.com/panel/axitec-ac-545mbt-144v 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.