--- title: "Solaria Solaria PowerX-400R vs Solaria Solaria PowerXT-400R-PM - Solar Panel Comparison | ComparePV" description: "Compare Solaria Solaria PowerX-400R vs Solaria Solaria PowerXT-400R-PM side by side: what actually differs, output when it is hot, thirty-year production, and the full specification." source: "https://comparepv.com/compare/solaria-solaria-powerx-400r/solaria-solaria-powerxt-400r-pm" updated: 2026-09-11 --- # Solaria Solaria PowerX-400R vs Solaria Solaria PowerXT-400R-PM PowerXT-400R-PM leads on the differences that matter The largest is performance warranty: 5 yrs longer. 5 of 17 comparable parameters are identical, with 2 more left out because at least one datasheet does not publish them. ## The two panels | Attribute | A | B | | --- | --- | --- | | Panel | [Solaria Solaria PowerX-400R](https://comparepv.com/panel/solaria-solaria-powerx-400r) | [Solaria Solaria PowerXT-400R-PM](https://comparepv.com/panel/solaria-solaria-powerxt-400r-pm) | | Manufacturer | Solaria | Solaria | | Power | 400 Wp | 400 Wp | | Efficiency | 20.50 % | 20.20 % | | Technology | | | ## Where they differ Ranked by how much the difference matters, not by datasheet order. | Parameter | PowerX-400R | PowerXT-400R-PM | Difference | | --- | --- | --- | --- | | Performance warranty | 25 yrs | 30 yrs | +5 yrs for PowerXT-400R-PM | | Temperature coefficient | -0.360 %/°C | -0.390 %/°C | +0.030 %/°C for PowerX-400R | | Product warranty | 25 yrs | 30 yrs | +5 yrs for PowerXT-400R-PM | | Open-circuit voltage | 37.30 V | 51.10 V | 13.80 V apart | | Short-circuit current | 13.68 A | 9.82 A | 3.86 A apart | | Module efficiency | 20.50 % | 20.20 % | +0.30 pp for PowerX-400R | | Weight per kWp | 55.2 kg/kWp | 52.5 kg/kWp | -2.8 kg/kWp for PowerXT-400R-PM | | Voltage at max power | 31.00 V | 42.40 V | 11.40 V apart | | Current at max power | 12.90 A | 9.41 A | 3.49 A apart | | Weight | 22.1 kg | 21.0 kg | -1.1 kg for PowerXT-400R-PM | | Module area | 1.954 m² | 1.979 m² | 0.025 m² apart | | Dimensions | 1723x1134x35 mm | 1644x1204x40 mm | 1723x1134x35 mm vs 1644x1204x40 mm | ## Every compared parameter | Parameter | PowerX-400R | PowerXT-400R-PM | | --- | --- | --- | | Rated power | 400 Wp | 400 Wp | | Module efficiency | 20.50 % | 20.20 % | | Power density | 204.7 Wp/m² | 202.1 Wp/m² | | Open-circuit voltage | 37.30 V | 51.10 V | | Voltage at max power | 31.00 V | 42.40 V | | Short-circuit current | 13.68 A | 9.82 A | | Current at max power | 12.90 A | 9.41 A | | Temperature coefficient | -0.360 %/°C | -0.390 %/°C | | Dimensions | 1723x1134x35 mm | 1644x1204x40 mm | | Module area | 1.954 m² | 1.979 m² | | Weight | 22.1 kg | 21.0 kg | | Weight per kWp | 55.2 kg/kWp | 52.5 kg/kWp | | Product warranty | 25 yrs | 30 yrs | | Performance warranty | 25 yrs | 30 yrs | | Annual degradation | 0.50 %/yr | 0.48 %/yr | | Cell technology | - | - | | Cell type | Monocrystalline | Monocrystalline | | Cell count | - | - | | Bifacial | No | No | ## Thirty-year yield Each panel's own declared degradation curve, at 1,200 kWh/kWp a year - **Cumulative output, PowerX-400R:** 13,068 kWh - **Cumulative output, PowerXT-400R-PM:** 13,110 kWh - **Gap:** 42 kWh ## Output when hot | Condition | Cell temperature | PowerX-400R | PowerXT-400R-PM | Retained | | --- | --- | --- | --- | --- | | Standard test conditions | 25 °C | 400 W | 400 W | 100.0% of rated power | | Cool, bright day | 40 °C | 378 W | 377 W | 94.2% of rated power | | Typical summer roof | 55 °C | 357 W | 353 W | 88.3% of rated power | | Hot roof | 70 °C | 335 W | 330 W | 82.5% of rated power | ## Against the whole database | Measure | PowerX-400R | PowerXT-400R-PM | Out of | Note | | --- | --- | --- | --- | --- | | Efficiency | #11,308 | #11,956 | 14,005 | PowerX-400R leads by 648 places | | Power density | #11,499 | #11,987 | 14,005 | PowerX-400R leads by 488 places | | Heat behaviour | #12,345 | #13,579 | 14,005 | PowerX-400R leads by 1,234 places | | Weight | #9,691 | #6,043 | 14,005 | PowerXT-400R-PM leads by 3,648 places | | Warranty | #9,798 | #21 | 14,005 | PowerXT-400R-PM leads by 9,777 places | | Overall | #10,732 | #9,549 | 14,005 | PowerXT-400R-PM leads by 1,183 places | ## Questions ### Which panel is better: Solaria Solaria PowerX-400R or Solaria Solaria PowerXT-400R-PM? According to our database: **Solaria **Solaria** PowerX-400R** has higher module efficiency (**20.50%** vs **20.20%**); **Solaria **Solaria** PowerX-400R** tolerates heat better (temp coeff **-0.360%/°C** vs **-0.390%/°C**). See the full spec comparison and 30-year energy simulation above for a complete picture. ### What is the efficiency of Solaria Solaria PowerX-400R and Solaria Solaria PowerXT-400R-PM? **Solaria **Solaria** PowerX-400R** has a module efficiency of **20.50%**, while **Solaria **Solaria** PowerXT-400R-PM** is **20.20%**. Higher efficiency means more electricity from the same roof area - useful when space is limited. ### What cell technology does Solaria Solaria PowerX-400R use vs Solaria Solaria PowerXT-400R-PM? **Solaria **Solaria** PowerX-400R** uses Monocrystalline cells; **Solaria **Solaria** PowerXT-400R-PM** uses Monocrystalline. Modern **n-type** technologies (**TOPCon**, **HJT**, BC) typically deliver higher efficiency and lower degradation compared to older **PERC** (p-type) cells. ### What is the warranty on Solaria Solaria PowerX-400R and Solaria Solaria PowerXT-400R-PM? **Solaria **Solaria** PowerX-400R** has a **25 years** power warranty; **Solaria **Solaria** PowerXT-400R-PM** has a **30 years** power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80**-87%**). Product (materials) warranties are usually shorter. ## Related comparisons - [Solaria Solaria PowerX-400R vs Solaria Solaria PowerX-395R](https://comparepv.com/compare/solaria-solaria-powerx-400r/solaria-solaria-powerx-395r) - One difference: module efficiency - [Solaria Solaria PowerX-400R vs Solaria Solaria PowerX-390R](https://comparepv.com/compare/solaria-solaria-powerx-400r/solaria-solaria-powerx-390r) - 3 differences, the largest is module efficiency - [Solaria Solaria PowerXT-400R-PM vs Solaria PowerXT 430R-PL](https://comparepv.com/compare/solaria-solaria-powerxt-400r-pm/solaria-powerxt-430r-pl) - 9 differences, the largest is rated power - [Solaria Solaria PowerXT-400R-PM vs Solaria Solaria PowerXT-430C-PD](https://comparepv.com/compare/solaria-solaria-powerxt-400r-pm/solaria-solaria-powerxt-430c-pd) - 13 differences, the largest is performance warranty - [Solaria Solaria PowerXT-400R-PM vs Solaria PowerXT 420R-PL](https://comparepv.com/compare/solaria-solaria-powerxt-400r-pm/solaria-powerxt-420r-pl) - 9 differences, the largest is rated power - [Solaria Solaria PowerXT-400R-PM vs Solaria Solaria PowerXT-420C-BD](https://comparepv.com/compare/solaria-solaria-powerxt-400r-pm/solaria-solaria-powerxt-420c-bd) - 13 differences, the largest is module efficiency --- Source: https://comparepv.com/compare/solaria-solaria-powerx-400r/solaria-solaria-powerxt-400r-pm Not in this file, on the page: the thirty-year yield curve year by year at a cell temperature you pick and a written summary generated on request.