--- title: "Seraphim SRP-685-BTC-BG 685W Solar Panel - Specs & Review | ComparePV" description: "Seraphim SRP-685-BTC-BG 685W solar panel. Specs: 22.05% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/seraphim-srp-685-btc-bg" updated: 2026-09-11 --- # Seraphim SRP-685-BTC-BG Middle of its segment, heavy for its output 249 panels in the segment TOPCon 650-700 W ## Identity - **Manufacturer:** Seraphim - **Model:** SRP-685-BTC-BG - **Series:** Sable 685-700W (TOPCon 210mm) - **Rated power:** 685 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 650-700 W (249 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 685 W | 665 W | Typical | | | Module efficiency | 22.05% | 22.40% | Weak - bottom 24% | 6,233 | | Power density | 220.5 | 223.7 | Weak - bottom 25% | 6,208 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight (kg) | 38.5 kg | 34.6 kg | Weak - bottom 19% | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.05% | 22.40% | Weak - bottom 24% | 6,233 | | Power density | 220.5 | 223.7 | Weak - bottom 25% | 6,208 | | Temperature coefficient | -0.290 | -0.290 | Typical | 2,165 | | Weight per kWp | 56.2 | 53.2 | Weak - bottom 19% | 10,487 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **56.2 kg per kWp** - Bottom 19% of the TOPCon 650-700 W segment, against a median of 53.2. - **22.05% module efficiency** - Bottom 24% of the TOPCon 650-700 W segment, against a median of 22.40%. - **220.5 watts per square metre** - Bottom 25% of the TOPCon 650-700 W segment, against a median of 223.7. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Weight-limited structures, tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 685 W - **Efficiency:** 22.05 % - **Voltage at Pmax (Vmp):** 39.93 V - **Current at Pmax (Imp):** 17.16 A - **Open-circuit voltage (Voc):** 47.90 V - **Short-circuit current (Isc):** 18.20 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:** 132 - **Bifacial:** yes ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.5 kg - **Area:** 3.11 m2 - **Power density:** 220.5 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:** 599 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 6233 of 14005 | | Power density | 6208 of 14005 | | Temperature coefficient | 2165 of 14005 | | Weight | 10487 of 14005 | | Warranty | 21 of 14005 | ## About this series Seraphim Sable 685-700W (TOPCon 210mm) is a series of modules designed for maximum energy generation from large installations, where every square meter and every hour of system operation counts. The use of **N-type TOPCon cells** helps to minimize power losses over time and maintain high efficiency even after years of operation. This series of modules is also distinguished by **low temperature coefficient** - which allows them to perform better in hot conditions, when standard panels experience a more significant drop in performance. The 210mm format design has been optimized for **reducing BOS (Balance of System) costs** - fewer modules for the same power output mean shorter installation times, fewer connections, and simpler farm-level work. Another advantage is **high bifaciality**, which allows for more efficient use of reflected light, which is important in bright environments or with appropriately selected support structures. This is the ideal choice for PV farms and C&I projects, where predictability and scalability are key. ## Notable figures - At 22.1% efficiency, this panel is on par with typical \*\*TOPCon 650-700W\*\* modules - 220.5 W/m² power density is 3.2 W/m² below \*\*TOPCon 650-700W\*\* median (223.7 W/m²) - requires larger installation area - Temperature coefficient of -0.29%/°C matches the \*\*TOPCon 650-700W\*\* median - At 38.5 kg, this panel is 3.9 kg heavier than the \*\*TOPCon 650-700W\*\* median (34.6 kg) - more demanding for installation crews - Bifacial design (80% factor) captures reflected light - adds 4-12% yield on ground-mount or white roof ## Questions ### What warranty comes with the Seraphim Sable 685-700W TOPCon panels? Seraphim provides a 15-year product warranty and a 30-year linear power output warranty on the Sable 685-700W series. Over three decades, the manufacturer guarantees a minimum power output level. For utility-scale solar farms and C&I projects where long-term yield predictability is critical, the extended power warranty is one of the most important selection criteria when evaluating module options. ### Are Seraphim Sable 700W panels suitable for large-scale solar farms? Yes, the Sable 685-700W series is designed primarily for utility-scale and C&I applications. The 210mm cell format with up to 700 W per module lets you reach the same system capacity with fewer panels, directly reducing BoS costs — fewer MC4 connectors, shorter installation time, and simpler on-site logistics. This translates into a lower LCOE for the overall project. ### How does TOPCon technology in Seraphim Sable panels differ from standard PERC cells? The N-type TOPCon cells used in the Sable series have a lower temperature coefficient (typically around -0.29%/°C) compared to PERC modules (around -0.35%/°C), meaning less power loss on hot days. TOPCon also shows lower LID and LeTID degradation rates, so the module retains output closer to its rated power for longer. This is why Seraphim backs these panels with a 30-year power warranty. ### How do Seraphim Sable 685-700W modules perform in hot weather? Very well. The N-type TOPCon cell technology gives the Sable series a low temperature coefficient, keeping efficiency high even when module operating temperature rises significantly. When panel temperature exceeds 25°C (STC reference point), power losses are smaller than with older PERC technology. For installations in climates with long, hot summers, this advantage delivers measurable gains in annual energy yield. ### How does bifacial technology work in Seraphim Sable panels, and what does an investor gain? Seraphim Sable modules are bifacial — the rear cell surface captures light reflected from the ground or a light-colored racking structure. On white gravel, light concrete, or a reflective membrane, bifacial gain can add several to over ten percent on top of the rated STC output. Ground-mounted systems (solar farms) typically benefit more than rooftop installations, especially when mounting height is optimized for rear-side irradiance. ### How many Seraphim Sable 690W modules are needed to build a 1 MW solar farm? At a rated output of 690 W per module, approximately 1,450 panels are needed to reach 1 MW. Thanks to the 210mm cell format and high per-module power, the Sable series requires fewer modules than older 182mm or smaller-format panels. This simplifies the electrical design, cuts installation time, and reduces BoS costs per installed megawatt of capacity. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/cf875083dedef60163c69791c448ae8d-f20d16c9a153.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | -35 W, lighter, +3.1 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | Cooler, lighter, +3.1 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | Cooler, lighter, +2.9 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | -40 W, lighter, +2.9 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Cooler, lighter, +2.9 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | Cooler, lighter, +2.8 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +2.8 pp | | [Seraphim SRP-645-BMC-BG](https://comparepv.com/panel/seraphim-srp-645-bmc-bg) | 645 W | -40 W, hotter, -1.3 pp | | [Seraphim SRP-650-BMC-BG](https://comparepv.com/panel/seraphim-srp-650-bmc-bg) | 650 W | -35 W, hotter, -1.1 pp | | [Seraphim SRP-655-BMC-BG](https://comparepv.com/panel/seraphim-srp-655-bmc-bg) | 655 W | -30 W, hotter, -1.0 pp | | [Seraphim SRP-660-BMC-HV](https://comparepv.com/panel/seraphim-srp-660-bmc-hv) | 660 W | Hotter, lighter, -5 yr warranty | | [Seraphim SRP-665-BMC-HV](https://comparepv.com/panel/seraphim-srp-665-bmc-hv) | 665 W | Hotter, lighter, -5 yr warranty | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +120 W, cooler, +3.1 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +115 W, cooler, +2.8 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +110 W, cooler, +2.8 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +105 W, cooler, +2.6 pp | --- Source: https://comparepv.com/panel/seraphim-srp-685-btc-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.