--- title: "Solaria Solaria PowerX-400R 400W Solar Panel - Specs & Review | ComparePV" description: "Solaria Solaria PowerX-400R 400W solar panel. Specs: 20.50% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solaria-solaria-powerx-400r" updated: 2026-09-11 --- # Solaria Solaria PowerX-400R Middle of its segment, weak in heat 6,519 panels in the 300-500 W band, all technologies ## Identity - **Manufacturer:** Solaria - **Model:** Solaria PowerX-400R - **Series:** PowerX Advantage Series - **Rated power:** 400 W - **Cell technology:** Monocrystalline ## How it compares Compared against 300-500 W band, all technologies (6519 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 400 W | 435 W | Weak - bottom 24% | | | Module efficiency | 20.50% | 21.30% | Typical | 11,308 | | Power density | 204.7 | 212.6 | Typical | 11,499 | | Temperature coefficient | -0.360 | -0.300 | Weak - bottom 11% | 12,345 | | Weight (kg) | 22.1 kg | 22.5 kg | Typical | | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.50% | 21.30% | Typical | 11,308 | | Power density | 204.7 | 212.6 | Typical | 11,499 | | Temperature coefficient | -0.360 | -0.300 | Weak - bottom 11% | 12,345 | | Weight per kWp | 55.2 | 53.2 | Typical | 9,691 | | Performance warranty | 25 yrs | 30 yrs | Weak - bottom 19% | 9,798 | ### Watch out for - **-0.360 %/°C temperature coefficient** - Bottom 11% of the 300-500 W band, against a median of -0.300. - **25 year performance warranty** - Bottom 19% of the 300-500 W band, against a median of 30 yrs. - **Best for:** Residential, shaded-installations and BIPV. - **Not ideal for:** Hot climates and owners who want a long output guarantee. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.50 % - **Voltage at Pmax (Vmp):** 31.00 V - **Current at Pmax (Imp):** 12.90 A - **Open-circuit voltage (Voc):** 37.30 V - **Short-circuit current (Isc):** 13.68 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.360 %/degC - **Temperature coefficient of Voc:** -0.280 %/degC - **Temperature coefficient of Isc:** 0.048 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline ### Physical - **Length:** 1723 mm - **Width:** 1134 mm - **Thickness:** 35 mm - **Weight:** 22.1 kg - **Area:** 1.95 m2 - **Power density:** 204.7 Wp/m2 ### Warranty and degradation - **Product warranty:** 25 years - **Performance warranty:** 25 years - **Output guaranteed at end of warranty:** 86.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.50 % - **Output after 30 years:** 334 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11308 of 14005 | | Power density | 11499 of 14005 | | Temperature coefficient | 12345 of 14005 | | Weight | 9691 of 14005 | | Warranty | 9798 of 14005 | ## About this series Solaria PowerX Advantage Series panels represent a breakthrough in roof space optimization thanks to the use of advanced cell interconnection technology that eliminates unnecessary gaps and increases the active energy-generating surface. This series solves the problem of limited installation space by offering **maximum power density**, which translates into significantly higher yields from every square meter of the installation. Thanks to their unique internal architecture, the modules exhibit exceptional **shade tolerance**, which is crucial for complex roof surfaces with chimneys or dormers. The use of large M10-type cells combined with an innovative layout ensures excellent performance even in challenging lighting conditions. For investors seeking uncompromising aesthetics, the Advantage series offers an **elegant all-black design** that blends perfectly with modern architecture, completely eliminating visible silver connections and busbars. This solution is dedicated primarily to demanding individual customers and companies that focus on the highest operating standards of the equipment. Compared to the competition, Solaria stands out with a **reduced risk of hot-spot formation** and increased mechanical resistance to extreme weather conditions, which guarantees stable electricity production for decades and a significantly faster return on investment in the photovoltaic system. ## Notable figures - At 20.5% efficiency, this panel is 1.3pp below the \*\*database\*\* median of 21.8% - Power density of 204.7 W/m² is 13.4 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - Temperature coefficient of -0.36%/°C is 0.06pp worse than \*\*database\*\* median (-0.30%/°C) - higher losses in summer heat - At 22.1 kg, this panel is 4.4 kg lighter than \*\*database\*\* median (26.5 kg) - easier handling during installation - Ranked #11308 out of 14005 panels for efficiency in the database ## Questions ### Are Solaria PowerX Advantage Series panels suitable for roofs with chimneys and dormers? Yes, the PowerX Advantage Series is specifically recommended for complex roof layouts. Its innovative parallel-connected sub-string architecture dramatically reduces shading losses — a chimney or dormer shade only deactivates the shaded cell segment rather than the entire module. This makes the system generate significantly more energy on a challenging roof compared to conventional panels. ### What warranty does the Solaria PowerX Advantage Series carry and what does it cover? The Solaria PowerX Advantage Series comes with a 25-year product warranty covering material defects and workmanship, plus a 25-year power output warranty guaranteeing at least 86% of the nominal rated power at end of term. Warranties are backed by Solaria Corporation, headquartered in Spain and subject to European quality standards. ### Is the Solaria PowerX Advantage Series a bifacial panel? No — the PowerX Advantage Series is a monofacial module. Energy is harvested from the front side only, which simplifies racking and mounting requirements. Rather than bifacial technology, Solaria maximizes front-side active area through advanced M10 cell dicing that eliminates gaps between cells, achieving module efficiency of approximately 20.5%. ### How many watts does a Solaria PowerX Advantage Series panel produce, and is that enough for a typical home? Each PowerX Advantage Series module delivers up to 400 Wp at roughly 20.5% module efficiency. A typical single-family home consuming 4,000–5,000 kWh per year usually requires 10–14 panels (a 4–5.6 kWp system). The high power density means fewer modules and less roof area are needed compared to lower-efficiency alternatives, reducing balance-of-system (BoS) costs. ### Why are the Solaria PowerX Advantage Series panels all-black, and does the dark backsheet reduce output? The Advantage Series is produced exclusively in an all-black aesthetic — black cells, black frame, and blacked-out busbars create a uniform appearance valued in modern architecture. A dark backsheet can slightly raise operating cell temperature, but Solaria has optimized the module design to minimize that effect. In practice, the annual energy yield difference versus a white-backsheet panel is negligible. ### How does the Solaria PowerX Advantage Series differ from standard half-cut panels on the market? The key difference is Solaria's proprietary cell cutting and layout technology, which goes further than standard half-cut: M10 cells are diced and arranged without visible gaps, increasing active power-generating area and reducing hot-spot risk. Parallel sub-string interconnection further improves shade tolerance. Standard half-cut panels lose proportionally more power under comparable partial shading conditions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/Datasheet-PowerX-400R-de7addfa78ee.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 | Cooler, +2.6 pp, +5 yr warranty | | [Just Solar JST-EDMH-(445-465)W-TD (450W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-450w-class) | 450 W | +50 W, cooler, +2.6 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +2.5 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, cooler, +2.5 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, cooler, +2.5 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.5 pp | | [Solaria SP310RHM6-54L](https://comparepv.com/panel/solaria-sp310rhm6-54l) | 310 W | -90 W, lighter, -4.6 pp | | [Solaria SP350YHM6-54L](https://comparepv.com/panel/solaria-sp350yhm6-54l) | 350 W | -50 W, lighter, -2.6 pp | | [Solaria SP370GHM6-54L](https://comparepv.com/panel/solaria-sp370ghm6-54l) | 370 W | -30 W, lighter, -1.6 pp | | [Solaria SP380BHM6-54L](https://comparepv.com/panel/solaria-sp380bhm6-54l) | 380 W | -20 W, lighter, -1.1 pp | | [Solaria Solaria PowerX-390R](https://comparepv.com/panel/solaria-solaria-powerx-390r) | 390 W | -10 W, -0.5 pp | | [Solaria Solaria PowerX-395R](https://comparepv.com/panel/solaria-solaria-powerx-395r) | 395 W | -0.3 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +110 W, cooler, +4.5 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +95 W, cooler, +4.3 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +105 W, cooler, +4.2 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +90 W, cooler, +4.0 pp | --- Source: https://comparepv.com/panel/solaria-solaria-powerx-400r Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.