--- title: "Meyer Burger MB_W120AyB_390 390W Solar Panel - Specs & Review | ComparePV" description: "Meyer Burger MB_W120AyB_390 390W solar panel. Specs: 21.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/meyer-burger-mb-w120ayb-390" updated: 2026-09-22 --- # Meyer Burger MB\_W120AyB\_390 Light for its output, short guarantee 45 panels in the segment HJT 350-400 W ## Identity - **Manufacturer:** Meyer Burger - **Model:** MB\_W120AyB\_390 - **Series:** Meyer Burger White - **Rated power:** 390 W - **Cell technology:** HJT ## How it compares Compared against segment HJT 350-400 W (45 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 390 W | 380 W | Strong - top 19% | | | Module efficiency | 21.20% | 20.90% | Typical | 9,076 | | Power density | 212.0 | 209.3 | Strong - top 23% | 9,093 | | Temperature coefficient | -0.259 | -0.259 | Typical | 480 | | Weight (kg) | 19.7 kg | 22.8 kg | Strong - top 7% | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.20% | 20.90% | Typical | 9,076 | | Power density | 212.0 | 209.3 | Strong - top 23% | 9,093 | | Temperature coefficient | -0.259 | -0.259 | Typical | 480 | | Weight per kWp | 50.5 | 59.2 | Strong - top 7% | 3,882 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Strengths - **50.5 kg per kWp** - Top 7% of the HJT 350-400 W segment, against a median of 59.2. Ranked 3,882nd in the whole database. - **212.0 watts per square metre** - Top 23% of the HJT 350-400 W segment, against a median of 209.3. ### Watch out for - **25 year performance warranty** - Bottom 19% of the HJT 350-400 W segment, against a median of 30 yrs. - **Best for:** Residential, commercial and hot-climate. - **Not ideal for:** Owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 390 W - **Efficiency:** 21.20 % - **Voltage at Pmax (Vmp):** 35.90 V - **Current at Pmax (Imp):** 10.30 A - **Open-circuit voltage (Voc):** 42.20 V - **Short-circuit current (Isc):** 10.80 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.259 %/degC - **Temperature coefficient of Voc:** -0.234 %/degC - **Temperature coefficient of Isc:** 0.033 %/degC - **NOCT:** 44 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 120 ### Physical - **Length:** 1767 mm - **Width:** 1041 mm - **Thickness:** 35 mm - **Weight:** 19.7 kg - **Area:** 1.84 m2 - **Power density:** 212.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 92.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.25 % - **Output after 30 years:** 354 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 9076 of 14005 | | Power density | 9093 of 14005 | | Temperature coefficient | 480 of 14005 | | Weight | 3882 of 14005 | | Warranty | 9798 of 14005 | ## Pros - **HJT cells with SmartWire technology** - The combination of heterojunction (HJT) cells with the proprietary SmartWire (SWCT) busbar-free grid reduces resistive interconnection losses and lowers the risk of microcracks, supporting more stable long-term module performance. - **Efficiency among the highest in its class** - Efficiency of 20.7-21.7% clearly outperforms comparable 400 Wp modules such as the Heliene 108HC (20.5%) or MWG Mono (19.32%), delivering more energy per unit of roof area. - **Very low annual power degradation** - Manufacturer data indicates HJT-based degradation of around 0.25% per year after year two, well below the 0.5-0.7% typical of conventional PERC modules, supporting predictable yield over the warranty period. - **Full 25/25-year warranty** - The manufacturer provides a 25-year product warranty alongside a 25-year linear power warranty, unlike many tier-1 competitors that split coverage into a shorter product warranty (often 12-15 years) and a longer power warranty. - **White backsheet supports yield** - The distinctive white backsheet reflects part of the incoming light back onto the cells, improving performance under variable and diffuse irradiance conditions, with a practical impact on real-world rooftop yield. ## Cons - **Discontinued production, limited service** - The Meyer Burger White series has been discontinued (released 2021, ended 2024), and Meyer Burger closed its German plant (March 2024) and Arizona facility (2024), limiting availability of replacement parts and after-sales support for existing installations. - **Manufacturer insolvency risk** - In 2025 Meyer Burger filed for insolvency and sold its manufacturing assets (including to Waaree), raising concerns about the practical enforceability of the 25-year product and power warranties for end users. ## About this series The Meyer Burger White series consists of modules designed for high energy production on typical roofs, without compromising durability. A key advantage is the combination of **HJT (heterojunction)** solar cells with the company's proprietary **SmartWire** technology, which minimizes losses at connections and helps reduce the risk of microcracks, which are often responsible for decreased performance over time. The characteristic white backsheet is not just for aesthetics - it reflects light, supporting the performance of the cells under real sunlight conditions, which translates to more stable output in variable weather. In practice, these panels solve the problem of "leaking" performance in hot weather and long-term degradation, offering **low power degradation** and predictable production over many years. An additional advantage is **enhanced mechanical strength** thanks to a reinforced front structure, which is important in hail and wind conditions. This is a good choice for prosumers and small to medium-sized businesses that want to maximize their energy yield from a limited area and rely on a technology that clearly differentiates itself from standard PERC modules. ## Notable figures - 21.2% module efficiency - 0.6pp better than the \*\*HJT 0-400W\*\* median of 20.6% - 212.0 W/m² power density - 5.6 W/m² more than \*\*HJT 0-400W\*\* median (206.4 W/m²), more power per roof area - Temperature coefficient of -0.26%/°C matches the \*\*HJT 0-400W\*\* median - Weight of 19.7 kg (1.8 kg below \*\*HJT 0-400W\*\* median of 21.5 kg) allows easier transport and roof mounting - Ranked #9076 out of 14005 panels for efficiency in the database ## Questions ### Are Meyer Burger White panels still available for purchase? The Meyer Burger White series has been officially discontinued. Meyer Burger filed for bankruptcy in 2025 following the closure of its German facility and the end of U.S. production in May 2025. Availability is limited to residual distributor stock. Before purchasing, confirm the seller has physical inventory and can provide the original product warranty or a third-party warranty insurance covering the remaining guarantee period. ### What is SmartWire technology in Meyer Burger White panels and why does it matter? SmartWire replaces conventional busbars with a grid of 18 to 32 micro-wires creating up to 1,760 contact points per cell. Current is collected uniformly across the cell surface, reducing mechanical stress and lowering the risk of micro-cracks that commonly cause long-term output losses. Compared to soldered busbar connections, SmartWire results in more stable power delivery and slower degradation over the panel's lifetime. ### What warranty does the Meyer Burger White series carry and is it still enforceable after the company's bankruptcy? Meyer Burger originally offered 25-year product and power warranties, guaranteeing at least 92% of rated output after 25 years and a degradation rate of just 0.25% per year. Following the company's insolvency, enforcing warranty claims directly with the manufacturer is uncertain. Buyers purchasing residual stock should verify whether the distributor or a third-party insurer provides replacement warranty coverage, a common practice with reputable sellers. ### How does the HJT cell technology in Meyer Burger White panels perform in hot weather? HJT cells have a low temperature coefficient, typically around -0.26% per °C, compared to roughly -0.35% per °C for standard PERC modules. At a module temperature of 70°C, an HJT panel produces measurably more power than a comparable PERC module. For rooftops that heat up significantly in summer, this translates into a higher annual energy yield and better return on investment over the system lifetime. ### Is the Meyer Burger White 400 Wp panel suitable for a typical pitched residential roof? Yes, the White series up to 400 Wp is designed for residential prosumer installations on pitched roofs. The reinforced front frame provides enhanced mechanical resistance against snow loads and wind pressure common in Central European climates. The white backsheet reflects diffuse light, supporting cell performance under overcast conditions that dominate outside summer months. Module dimensions and weight are standard for conventional mounting systems. ### How do Meyer Burger White panels compare to standard PERC modules on the market? The key differences lie in cell and interconnection technology. Standard PERC modules use passivated-emitter rear-contact cells with conventional busbar soldering and typically show annual degradation of 0.45 to 0.55%. The White series uses HJT cells with amorphous silicon layers and SmartWire interconnection instead of busbars. The result is higher efficiency, better performance at elevated temperatures and low irradiance, and a lower annual degradation rate of 0.25%, yielding more lifetime energy output per watt installed. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/ds-meyer-burger-white-en-e6d045321c74.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Luxor Solar LX-440M/182-108+GG](https://comparepv.com/panel/luxor-solar-lx-440m-182-108-gg) | 440 W | +50 W, +1.9 pp, +5 yr warranty | | [Gamko New Energy GKA210M340W](https://comparepv.com/panel/gamko-new-energy-gka210m340w) | 340 W | -50 W, +1.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M360W](https://comparepv.com/panel/gamko-new-energy-gka210m360w) | 360 W | Lighter, +1.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/4\*4\*38)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-4-4-38) | 380 W | Lighter, +1.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/2\*4\*20)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-2-4-20) | 400 W | Lighter, +1.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M400W (1/4\*4\*40)](https://comparepv.com/panel/gamko-new-energy-gka210m400w-1-4-4-40) | 400 W | Lighter, +1.8 pp, +5 yr warranty | | [Gamko New Energy GKA210M380W (1/2\*4\*19)](https://comparepv.com/panel/gamko-new-energy-gka210m380w-1-2-4-19) | 380 W | Lighter, +1.8 pp, +5 yr warranty | | [Jetion JT440SYK(B)](https://comparepv.com/panel/jetion-jt440syk-b) | 440 W | +50 W, +1.7 pp, +5 yr warranty | | [Meyer Burger MB\_B120AyB\_375](https://comparepv.com/panel/meyer-burger-mb-b120ayb-375) | 375 W | -15 W, -0.8 pp | | [Meyer Burger MB\_W120AyB\_380](https://comparepv.com/panel/meyer-burger-mb-w120ayb-380) | 380 W | -10 W, -0.5 pp | | [Meyer Burger MB\_W120AyB\_385](https://comparepv.com/panel/meyer-burger-mb-w120ayb-385) | 385 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +120 W, +3.8 pp, +5 yr warranty | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +105 W, +3.6 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +115 W, +3.5 pp, +5 yr warranty | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +100 W, +3.3 pp, +5 yr warranty | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +110 W, +3.3 pp, +5 yr warranty | --- Source: https://comparepv.com/panel/meyer-burger-mb-w120ayb-390 Not in this file, on the page: the I-V and temperature curves lifted from the manufacturer's datasheet, a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.