--- title: "Axitec AC-620TGB/132TS 620W Solar Panel - Specs & Review | ComparePV" description: "Axitec AC-620TGB/132TS 620W solar panel. Specs: 22.95% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/axitec-ac-620tgb-132ts" updated: 2026-09-11 --- # Axitec AC-620TGB/132TS Middle of its segment, weak in heat 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Axitec - **Model:** AC-620TGB/132TS - **Series:** AXIbiperfect GQ TS - **Rated power:** 620 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 620 W | 620 W | Typical | | | Module efficiency | 22.95% | 22.80% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight (kg) | 32.5 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.95% | 22.80% | Typical | 2,268 | | Power density | 229.5 | 227.7 | Typical | 2,191 | | Temperature coefficient | -0.310 | -0.290 | Weak - bottom 4% | 8,005 | | Weight per kWp | 52.4 | 53.1 | Typical | 5,893 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.310 %/°C temperature coefficient** - Bottom 4% of the TOPCon 600-650 W segment, against a median of -0.290. Ranked 8,005th in the whole database. - **Best for:** Residential, commercial, utility-scale and shaded-installations. - **Not ideal for:** Hot climates. ## Specification ### Electrical - **Rated power (Pmax):** 620 W - **Efficiency:** 22.95 % - **Voltage at Pmax (Vmp):** 40.61 V - **Current at Pmax (Imp):** 15.27 A - **Open-circuit voltage (Voc):** 48.32 V - **Short-circuit current (Isc):** 16.24 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.310 %/degC - **Temperature coefficient of Voc:** -0.260 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 132 - **Bifacial:** yes ### Physical - **Length:** 2382 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 32.5 kg - **Area:** 2.70 m2 - **Power density:** 229.5 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2268 of 14005 | | Power density | 2191 of 14005 | | Temperature coefficient | 8005 of 14005 | | Weight | 5893 of 14005 | | Warranty | 21 of 14005 | ## Pros - **30-Year Linear Product and Performance Warranty** - Axitec guarantees a minimum of 87.4% rated output power after 30 years, with an annual degradation rate of ~0.4%/year — well below the industry average of 0.7–0.8%/year. By comparison, most mainstream manufacturers offer 12–15-year product warranties and 25-year performance warranties (e.g., down to 84.8% after 25 years). A 30-year warranty covering both product and performance represents a genuine financial liability assumed by the manufacturer, not merely a marketing statement. - **Bifacial Design with Up to 30% Rear-Side Gain** - The bifacial construction enables absorption of light reflected from the ground surface. Axitec rates rear-side bifacial gain at up to 30%, which translates into measurably higher annual energy yield in ground-mount installations with high-albedo surfaces or on rooftops with lighter-colored membrane underlays — at no additional land or area cost. - **N-Type TOPCon: Lower Degradation and Superior High-Temperature Performance** - N-type cells eliminate light-induced degradation (LID) characteristic of legacy P-type PERC technology. The temperature coefficient of comparable Axitec TOPCon modules is approximately -0.30%/°C, resulting in lower power losses on hot summer days — particularly significant from May through September, when module temperatures routinely exceed 50°C. - **Glass-Glass Construction Enhances Long-Term Durability** - The use of 2.0 mm glass on both sides of the module instead of a rear backsheet significantly reduces moisture ingress, microcracks, and PID (Potential Induced Degradation). In the Polish climate, with its wide seasonal temperature swings, this translates into greater mechanical longevity and higher reliability after 15–20 years of operation. - **22.21–22.95% Efficiency — Premium Class** - The efficiency range of this series places it on par with direct competitors (MY Solar 22.95%, HT-SAAE and Weran Solar 23%) at a peak power of 620 Wp. For rooftop installations with constrained surface area, the higher power density means more kWp deployed within the same roof footprint. ## Cons - **No Tier-1 BNEF Status** - Axitec does not appear on the Bloomberg NEF Tier-1 module manufacturer list (as of Q1 2026), which may complicate or preclude bank financing for commercial and utility-scale projects. Institutional investors and project finance lenders for PV plants commonly require Tier-1 modules as a condition for non-recourse debt. - **Limited Availability and Smaller Manufacturing Scale** - Axitec is a relatively small company — significantly smaller than market leaders such as LONGi, Jinko, and Trina. In practice, this may result in longer lead times, reduced negotiating leverage on large-volume orders, and potentially more limited access to warranty service outside Western European markets. ## About this series The Axitec AXIbiperfect GQ TS series is designed for high performance in real-world conditions, both on rooftops and in ground-mounted installations. The use of a **dual-sided bifacial design** allows for the utilization of reflected light from the ground, which translates into improved energy production in situations where every additional kilowatt-hour counts. The modules are based on **N-Type TOPCon cells**, which are valued for their stable performance and favorable operation at elevated temperatures, helping to minimize power losses on hot days. Another distinguishing feature of this series is the **glass-glass construction**, which increases resistance to moisture, microcracks, and accelerated aging, making the modules more suitable for demanding climates. The **half-cut design** also provides practical benefits, supporting higher efficiency under partial shading and reducing losses at connections. AXIbiperfect GQ TS is a good choice for investors who want to combine durability, predictable performance, and modern technology in residential and commercial projects. ## Notable figures - Efficiency of 22.9% matches the \*\*TOPCon 600-650W\*\* median - Power density of 229.5 W/m² matches the \*\*TOPCon 600-650W\*\* median - -0.31%/°C temperature coefficient - 0.02pp worse than \*\*TOPCon 600-650W\*\* median (-0.29%/°C), expect higher hot weather losses - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof - In the top 16% for efficiency among all TOPCon panels ## Questions ### What is the maximum power output of the Axitec AXIbiperfect GQ TS series, and how many cells does the module contain? The top-tier variant of the AXIbiperfect GQ TS series delivers 620 Wp. The module is built with 132 half-cut cells using N-Type TOPCon technology, resulting in high efficiency within relatively compact dimensions. The full series spans 600–620 Wp, allowing investors to select the appropriate variant for the specific requirements of their project. ### Does the bifacial dual-glass construction of the AXIbiperfect GQ TS genuinely increase energy yield, and under what conditions does it make sense? Yes, a bifacial panel captures light from both the front and rear sides — including light reflected from bright surfaces such as concrete, light-colored roofing membranes, or gravel. The real-world production bonus typically ranges from 5–15%, depending on the albedo of the surrounding environment. The greatest benefit is realized in ground-mounted installations with high-albedo substrates or on rooftops with white membranes. On dark roof tiles, the bifacial gain is minimal. ### What warranty coverage applies to the Axitec AXIbiperfect GQ TS series? Axitec provides a 30-year product warranty and a 30-year power output warranty for the AXIbiperfect GQ TS series. After three decades of operation, the panel is guaranteed to retain at least 87.4% of its original rated power. This is one of the longest warranties available on the market, reflecting the manufacturer's confidence in the durability of the glass-glass construction. ### Does the AXIbiperfect GQ TS perform well in summer when rooftop temperatures rise significantly? N-Type TOPCon technology exhibits a lower temperature coefficient of power than older P-Type cells. In practice, this translates to smaller production losses on hot days. Modules in this series are therefore better suited to high-temperature conditions than standard monocrystalline panels — a meaningful advantage for investors in regions with high solar irradiance and elevated ambient temperatures. ### Are the Axitec AXIbiperfect GQ TS panels suitable for ground-mounted installations, and how do they withstand harsh weather conditions? Yes, the AXIbiperfect GQ TS series is designed for both rooftop and ground-mounted applications. The glass-glass construction withstands a snow load of up to 5,400 Pa and a wind uplift pressure of up to 2,400 Pa. The frameless module enclosure provides effective protection against moisture and corrosion, making the panels well suited to the demanding climate conditions typical of Central Europe. ### Is Axitec a European manufacturer, and does that matter when purchasing the AXIbiperfect GQ TS? Axitec Energy is headquartered in Germany, which means European quality standards, regulatory oversight, and in-region warranty service. The manufacturer is not, however, listed in the Bloomberg NEF Tier 1 ranking, which is worth considering for bank financing of large-scale solar farms. For residential investors and smaller commercial installations, Axitec is a solid brand backed by a 30-year warranty and a proven European service infrastructure. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/DB_132zlg_biperfect_GQ_TS_MiA_EN-70f0a698645f.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.2 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | +50 W, cooler, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | +50 W, cooler, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | +50 W, cooler, +1.9 pp | | [Axitec AC-600TGB/132TS](https://comparepv.com/panel/axitec-ac-600tgb-132ts) | 600 W | -20 W, -0.7 pp | | [Axitec AC-605TGB/132TS](https://comparepv.com/panel/axitec-ac-605tgb-132ts) | 605 W | -15 W, -0.6 pp | | [Axitec AC-610TGB/132TS](https://comparepv.com/panel/axitec-ac-610tgb-132ts) | 610 W | -10 W, -0.4 pp | | [Axitec AC-615TGB/132TS](https://comparepv.com/panel/axitec-ac-615tgb-132ts) | 615 W | Very close match | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +60 W, cooler, +2.2 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +55 W, cooler, +2.1 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +80 W, cooler, +2.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +75 W, cooler, +1.9 pp | --- Source: https://comparepv.com/panel/axitec-ac-620tgb-132ts Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.