--- title: "Seraphim SRP-425-BTD-BG 425W Solar Panel - Specs & Review | ComparePV" description: "Seraphim SRP-425-BTD-BG 425W solar panel. Specs: 21.76% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/seraphim-srp-425-btd-bg" updated: 2026-09-11 --- # Seraphim SRP-425-BTD-BG Middle of its segment, heavy for its output 1,218 panels in the segment TOPCon 400-450 W ## Identity - **Manufacturer:** Seraphim - **Model:** SRP-425-BTD-BG - **Series:** Sable - **Rated power:** 425 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 400-450 W (1218 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 425 W | 435 W | Typical | | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 24.0 kg | 22.0 kg | Weak - bottom 18% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 21.76% | 22.00% | Typical | 7,285 | | Power density | 217.6 | 220.2 | Typical | 7,172 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 56.5 | 51.4 | Weak - bottom 18% | 10,661 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **56.5 kg per kWp** - Bottom 18% of the TOPCon 400-450 W segment, against a median of 51.4. - **Best for:** Commercial, utility-scale and shaded-installations. - **Not ideal for:** Weight-limited structures. ## Specification ### Electrical - **Rated power (Pmax):** 425 W - **Efficiency:** 21.76 % - **Voltage at Pmax (Vmp):** 32.10 V - **Current at Pmax (Imp):** 13.24 A - **Open-circuit voltage (Voc):** 38.70 V - **Short-circuit current (Isc):** 13.91 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.290 %/degC - **Temperature coefficient of Voc:** -0.250 %/degC - **Temperature coefficient of Isc:** 0.046 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 108 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 1722 mm - **Width:** 1134 mm - **Thickness:** 30 mm - **Weight:** 24.0 kg - **Area:** 1.95 m2 - **Power density:** 217.6 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 87.4 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.40 % - **Output after 30 years:** 371 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 7285 of 14005 | | Power density | 7172 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 10661 of 14005 | | Warranty | 21 of 14005 | ## About this series Seraphim Sable is a series of modules based on **N-type TOPCon cells**, designed to achieve high energy yields even under less-than-ideal conditions. Thanks to passivated contacts and a **multi-busbar architecture**, the panels efficiently "collect" current from the cells and perform better in shaded or low-light conditions - which is a significant advantage in the Polish climate, leading to more stable daily energy production. In practice, Sable solves a common problem for investors: how to increase yield without adding more modules. This is facilitated by the **glass-to-glass bifacial design**, which can also utilize reflected light from the ground, while also improving resistance to environmental factors. Another key feature is the focus on **low power degradation over time**, which makes it easier to plan the long-term profitability of the installation. It is a good choice for residential and commercial installations, as well as ground-mounted projects - anywhere where high production, durability, and predictability are important. ## Notable figures - At 21.8% efficiency, this panel is on par with typical \*\*TOPCon 400-450W\*\* modules - At 217.6 W/m² power density, roof space requirements are typical for \*\*TOPCon 400-450W\*\* panels - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 400-450W\*\* median - At 24.0 kg, this panel is 2.0 kg heavier than the \*\*TOPCon 400-450W\*\* median (22.0 kg) - more demanding for installation crews - Bifaciality factor of 80% can add 4-12% extra yield with reflective mounting surface ## Questions ### What warranty does the Seraphim Sable series come with? The Sable series includes a 15-year product warranty covering defects in materials and workmanship, plus a 30-year power output warranty. After 30 years, Seraphim guarantees at least 84.95% of the rated power. Thanks to TOPCon technology, annual degradation sits at approximately 0.4%, making long-term yield forecasting straightforward for system owners and investors. ### What is TOPCon technology and why choose Seraphim Sable over older PERC panels? TOPCon (Tunnel Oxide Passivated Contact) is an N-type cell design where a thin silicon oxide layer reduces carrier recombination losses. Sable panels deliver higher conversion efficiency than standard PERC cells and a lower temperature coefficient of around -0.29%/°C, meaning smaller power losses on hot days. LID-related initial degradation is below 1%, stabilizing at roughly 0.4% per year thereafter. ### Do Seraphim Sable panels perform well in overcast conditions and low irradiance, typical of Northern European climates? Yes. The multi-busbar architecture shortens current-flow paths between cells and reduces resistive losses at low irradiance. N-type TOPCon cells also show high sensitivity to diffuse light. This translates into measurably better energy yield during cloudy mornings and afternoons, which account for a significant share of production hours in Central and Northern Europe. ### What is the maximum power output of the Seraphim Sable module, and will a 720 Wp panel fit on a typical residential roof? The top variant of the Sable series reaches 720 Wp using 210 mm cells with module efficiency exceeding 23%. This is a large-format panel primarily suited for ground-mount and commercial rooftop installations. For residential projects, Seraphim offers smaller variants within the same Sable series compatible with standard racking systems — confirm the available model with your installer. ### Is Seraphim a reliable manufacturer? Where are they based and are they Tier 1? Seraphim Solar is a Chinese PV manufacturer headquartered in Nantong, operating since 2011 and holding Tier 1 status as recognized by independent rating agencies including BNEF. Tier 1 classification indicates bank-financeable track record and consistent manufacturing capacity, which significantly lowers long-term warranty risk for the system owner. ### What temperature range can Seraphim Sable panels handle, and do they work well in winter? Sable panels are certified for an operating temperature range of -40°C to +85°C, so cold winters pose no risk whatsoever. In fact, N-type TOPCon cells have a lower temperature coefficient than PERC technology, meaning cold but sunny winter days can be especially productive — low ambient temperature reduces thermal losses and boosts output relative to rated STC conditions. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/d40936599d5d691b4ff213f4d3340bc9-f7cd2c6abbe0.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [Maxeon SPR-MAX7-475](https://comparepv.com/panel/maxeon-spr-max7-475) | 475 W | +50 W, +2.2 pp, +10 yr warranty | | [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 | +40 W, lighter, +2.0 pp | | [JA Solar JAT54S40-475/LR](https://comparepv.com/panel/ja-solar-jat54s40-475-lr) | 475 W | +50 W, lighter, +2.0 pp | | [Tongwei TWMNH-48HW475](https://comparepv.com/panel/tongwei-solar-twmnh-48hw475) | 475 W | +50 W, +2.0 pp | | [Astronergy CHSM48RN(DG)/F-BH-475](https://comparepv.com/panel/astronergy-chint-new-energy-technology-co-ltd-chsm48rn-dg-f-bh-475) | 475 W | +50 W, +2.0 pp | | [AIKO AIKO-A475-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a475-mce54mw) | 475 W | +50 W, lighter, +2.0 pp | | [AIKO AIKO-A475-MAH54Mw](https://comparepv.com/panel/aiko-aiko-a475-mah54mw) | 475 W | +50 W, cooler, +2.0 pp | | [Seraphim SRP-395-BMD-HV](https://comparepv.com/panel/seraphim-srp-395-bmd-hv) | 395 W | Hotter, -1.5 pp, -5 yr warranty | | [Seraphim SRP-400-BMD-BG](https://comparepv.com/panel/seraphim-srp-400-bmd-bg) | 400 W | -25 W, hotter, -1.3 pp | | [Seraphim SRP-405-BMD-BG](https://comparepv.com/panel/seraphim-srp-405-bmd-bg) | 405 W | -20 W, hotter, -1.0 pp | | [Longi Solar LR7-54HJD-510M](https://comparepv.com/panel/longi-lr7-54hjd-510m) | 510 W | +85 W, cooler, +3.2 pp | | [AIKO AIKO-A495-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a495-mce54mw) | 495 W | +70 W, lighter, +3.0 pp | | [Longi Solar LR7-54HJD-505M](https://comparepv.com/panel/longi-lr7-54hjd-505m) | 505 W | +80 W, cooler, +2.9 pp | | [AIKO AIKO-A490-MCE54Mw](https://comparepv.com/panel/aiko-aiko-a490-mce54mw) | 490 W | +65 W, lighter, +2.7 pp | | [Longi Solar LR7-54HJD-500M](https://comparepv.com/panel/longi-lr7-54hjd-500m) | 500 W | +75 W, cooler, +2.7 pp | | [Talesun CIPRO-TN9C54M-500W](https://comparepv.com/panel/talesun-cipro-tn9c54m-500w) | 500 W | +75 W, cooler, +2.7 pp | --- Source: https://comparepv.com/panel/seraphim-srp-425-btd-bg 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.