--- title: "Solaria Solaria PowerXT-400R-PM 400W Solar Panel - Specs & Review | ComparePV" description: "Solaria Solaria PowerXT-400R-PM 400W solar panel. Specs: 20.20% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/solaria-solaria-powerxt-400r-pm" updated: 2026-09-11 --- # Solaria Solaria PowerXT-400R-PM Middle of its segment, weak in heat 6,519 panels in the 300-500 W band, all technologies ## Identity - **Manufacturer:** Solaria - **Model:** Solaria PowerXT-400R-PM - **Series:** Solaria PowerXT - **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 | 20.20% | 21.30% | Weak - bottom 22% | 11,956 | | Power density | 202.1 | 212.6 | Weak - bottom 22% | 11,987 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 2% | 13,579 | | Weight (kg) | 21.0 kg | 22.5 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 20.20% | 21.30% | Weak - bottom 22% | 11,956 | | Power density | 202.1 | 212.6 | Weak - bottom 22% | 11,987 | | Temperature coefficient | -0.390 | -0.300 | Weak - bottom 2% | 13,579 | | Weight per kWp | 52.5 | 53.2 | Typical | 6,043 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **-0.390 %/°C temperature coefficient** - Bottom 2% of the 300-500 W band, against a median of -0.300. Ranked 13,579th in the whole database. - **20.20% module efficiency** - Bottom 22% of the 300-500 W band, against a median of 21.30%. - **202.1 watts per square metre** - Bottom 22% of the 300-500 W band, against a median of 212.6. - **Best for:** Residential and shaded-installations. - **Not ideal for:** Hot climates, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 400 W - **Efficiency:** 20.20 % - **Voltage at Pmax (Vmp):** 42.40 V - **Current at Pmax (Imp):** 9.41 A - **Open-circuit voltage (Voc):** 51.10 V - **Short-circuit current (Isc):** 9.82 A - **Max system voltage:** 1000 V ### Temperature - **Temperature coefficient of Pmax:** -0.390 %/degC - **Temperature coefficient of Voc:** -0.290 %/degC - **Temperature coefficient of Isc:** 0.040 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline ### Physical - **Length:** 1644 mm - **Width:** 1204 mm - **Thickness:** 40 mm - **Weight:** 21.0 kg - **Area:** 1.98 m2 - **Power density:** 202.1 Wp/m2 ### Warranty and degradation - **Product warranty:** 30 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 84.0 % - **First-year degradation:** 2.00 % - **Annual degradation:** 0.48 % - **Output after 30 years:** 336 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 11956 of 14005 | | Power density | 11987 of 14005 | | Temperature coefficient | 13579 of 14005 | | Weight | 6043 of 14005 | | Warranty | 21 of 14005 | ## About this series The Solaria PowerXT series is designed to maximize energy generation from the same roof area - without compromising aesthetics. The modules feature **shingled technology** and a refined connection architecture, ensuring high efficiency even when part of the surface is intermittently shaded by a chimney, skylight, or balustrade. This is a real advantage in Polish conditions, where roofs are rarely perfectly uniform and free from obstructions. PowerXT also emphasizes **uniform, deep black (Pure Black)** - without visible gaps between the cells and without a "lattice" effect, which will be appreciated by investors who care about the appearance of the facade. Another advantage is **high power density**, which helps to reduce the number of modules and simplify the design of installations on roofs with limited area. This solution is particularly suitable for single-family homes and premium projects, where **resistance to shading losses** and long-term peace of mind thanks to **comprehensive warranty protection** are important. ## Notable figures - Module efficiency of 20.2% is 1.6pp below average for \*\*database\*\* panels (median: 21.8%) - Power density of 202.1 W/m² is 16.0 W/m² below \*\*database\*\* median (218.1 W/m²) - needs more roof space - Temperature coefficient of -0.39%/°C is 0.09pp worse than \*\*database\*\* median (-0.30%/°C) - higher losses in summer heat - Weight of 21.0 kg (5.5 kg below \*\*database\*\* median of 26.5 kg) allows easier transport and roof mounting - Ranked #11956 out of 14005 panels for efficiency in the database ## Questions ### Is the Solaria PowerXT series still available for purchase? The Solaria PowerXT series has been discontinued and is no longer offered as new stock by authorized distributors. Occasional units may surface in installer warehouses or on the secondary market, but availability is severely limited. If you are planning a new installation, ask your installer about currently available modules with comparable specifications. ### How does the shingled cell technology in Solaria PowerXT panels work? The shingled technology cuts monocrystalline cells into narrow strips that overlap like roof shingles and are bonded with an electrically conductive adhesive instead of traditional busbars. This allows more cells per panel area, and the parallel string architecture ensures that shading one zone does not shut down the entire string. Third-party outdoor tests showed PowerXT generates 64–83% more energy under partial shading conditions compared to conventional modules. ### What warranty does the Solaria PowerXT come with, and what does it cover? Solaria PowerXT carries a 30-year product warranty and a 30-year linear power output warranty. This means the module is guaranteed to maintain the manufacturer-specified power level for three decades. It is one of the longest warranty terms in the residential PV segment and is a key argument for premium single-family home installations where long-term reliability matters. ### Are Solaria PowerXT 400 Wp panels suitable for a roof with a chimney or dormers? Yes, this is one of the primary use cases for this series. The shingled cell technology and parallel interconnect architecture make PowerXT modules significantly more shade-tolerant than conventional PERC panels with busbars. A chimney, railing, or dormer shading part of the panel surface does not suppress output from the unshaded cells, which is a measurable advantage on the complex rooflines common in Polish residential construction. ### Is the Solaria PowerXT a bifacial solar panel? No, the Solaria PowerXT is a monofacial module with no rear-side power generation. It produces electricity solely from front-side irradiance. This is offset by high power density (up to 400 Wp) and the shingled architecture's effective shade loss mitigation, which on typical rooftop residential installations provides more practical benefit than bifacial gain. ### How does the aesthetics of Solaria PowerXT compare to standard all-black modules? Solaria PowerXT features a Pure Black finish: uniform deep black with no visible gaps between cells and no silver or white busbars. The result is noticeably cleaner than standard full-black PERC modules that still show grid lines under direct light. This is a strong argument for installations on upscale residential properties or any project where roof appearance is a priority. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/datasheet-powerxt-resi-400pm-894d13c808cc.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 | +40 W, cooler, +2.9 pp | | [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, +2.9 pp | | [Q-SUN Solar QNN182-HG450-54](https://comparepv.com/panel/qn-solar-pv-limited-qnn182-hg450-54) | 450 W | +50 W, cooler, +2.8 pp | | [Huayao HY440-N108BDD](https://comparepv.com/panel/huayao-hy440-n108bdd) | 450 W | +50 W, cooler, +2.8 pp | | [BYD NLBK-27-450](https://comparepv.com/panel/byd-nlbk-27-450) | 450 W | +50 W, cooler, +2.8 pp | | [Renesola RS41-450NBG-E3](https://comparepv.com/panel/renesola-rs41-450nbg-e3) | 450 W | +50 W, cooler, +2.8 pp | | [Just Solar JST-EDMH-(445-465)W-TD (465W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-465w-class) | 465 W | +65 W, cooler, +3.6 pp | | [AIKO AIKO-A460-MAH54Mb](https://comparepv.com/panel/aiko-shenzhen-aiko-digital-energy-technology-co-ltd-aiko-a460-mah54mb-1) | 460 W | +60 W, cooler, +3.4 pp | | [Just Solar JST-EDMH-(445-465)W-TD (460W class)](https://comparepv.com/panel/just-solar-jst-edmh-445-465-w-td-460w-class) | 460 W | +60 W, cooler, +3.4 pp | | [Philadelphia Solar PS-MNB108(HCBF)-460W](https://comparepv.com/panel/philadelphia-solar-ps-mnb108-hcbf-460w) | 460 W | +60 W, cooler, +3.3 pp | | [AIKO AIKO-455-MAH54Db](https://comparepv.com/panel/aiko-aiko-455-mah54db) | 455 W | +55 W, cooler, +3.1 pp | | [Longi Solar LR5-54HTH-455M](https://comparepv.com/panel/longi-lr5-54hth-455m) | 455 W | +55 W, cooler, +3.1 pp | --- Source: https://comparepv.com/panel/solaria-solaria-powerxt-400r-pm Not in this file, on the page: a thirty-year output simulator and alternatives filtered by how closely they match these dimensions.