--- title: "Seraphim SRP-705-BHC-BG 705W Solar Panel - Specs & Review | ComparePV" description: "Seraphim SRP-705-BHC-BG 705W solar panel. Specs: 22.70% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/seraphim-srp-705-bhc-bg" updated: 2026-09-11 --- # Seraphim SRP-705-BHC-BG Middle of its segment, modest efficiency 222 panels in the segment HJT 700-750 W ## Identity - **Manufacturer:** Seraphim - **Model:** SRP-705-BHC-BG - **Series:** Hydra - **Rated power:** 705 W - **Cell technology:** HJT - **Bifacial:** yes ## How it compares Compared against segment HJT 700-750 W (222 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 705 W | 715 W | Weak - bottom 22% | | | Module efficiency | 22.70% | 23.02% | Weak - bottom 20% | 3,307 | | Power density | 227.0 | 230.2 | Weak - bottom 22% | 3,361 | | Temperature coefficient | -0.258 | -0.240 | Typical | 466 | | Weight (kg) | 38.5 kg | 38.3 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.70% | 23.02% | Weak - bottom 20% | 3,307 | | Power density | 227.0 | 230.2 | Weak - bottom 22% | 3,361 | | Temperature coefficient | -0.258 | -0.240 | Typical | 466 | | Weight per kWp | 54.6 | 53.6 | Typical | 8,959 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Watch out for - **22.70% module efficiency** - Bottom 20% of the HJT 700-750 W segment, against a median of 23.02%. - **227.0 watts per square metre** - Bottom 22% of the HJT 700-750 W segment, against a median of 230.2. - **Best for:** Utility-scale, commercial and hot-climate. - **Not ideal for:** Tight roof space and roofs where every square metre has to count. ## Specification ### Electrical - **Rated power (Pmax):** 705 W - **Efficiency:** 22.70 % - **Voltage at Pmax (Vmp):** 42.30 V - **Current at Pmax (Imp):** 16.70 A - **Open-circuit voltage (Voc):** 50.32 V - **Short-circuit current (Isc):** 17.50 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.258 %/degC - **Temperature coefficient of Voc:** -0.270 %/degC - **Temperature coefficient of Isc:** 0.055 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** HJT - **Cell count:** 132 - **Bifacial:** yes - **Bifacial gain:** 30.00 ### Physical - **Length:** 2384 mm - **Width:** 1303 mm - **Thickness:** 33 mm - **Weight:** 38.5 kg - **Area:** 3.11 m2 - **Power density:** 227.0 Wp/m2 ### Warranty and degradation - **Product warranty:** 15 years - **Performance warranty:** 30 years - **Output guaranteed at end of warranty:** 90.3 % - **First-year degradation:** 1.00 % - **Annual degradation:** 0.30 % - **Output after 30 years:** 637 W ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 3307 of 14005 | | Power density | 3361 of 14005 | | Temperature coefficient | 466 of 14005 | | Weight | 8959 of 14005 | | Warranty | 21 of 14005 | ## About this series The Seraphim Hydra series is a breakthrough solution based on **HJT cell technology**, which redefines performance standards in modern photovoltaics. These modules have been designed for investments requiring maximum energy yield from every square meter, making them the ideal choice for utility-scale farms and advanced commercial installations. What sets the Hydra series apart from the competition is its **record-breaking bifaciality of 90%**, allowing for significantly more efficient use of light reflected from the ground compared to standard bifacial modules. Thanks to the use of a **low temperature coefficient**, these panels maintain high efficiency even on very hot days, effectively minimizing power losses resulting from cell heating. The module design also guarantees **exceptional resistance to PID and LID degradation**, which translates into stable operation and minimal annual power loss over a thirty-year service life. By choosing the Hydra series, investors receive a product with high mechanical strength that performs excellently in low-light conditions. It is a solution dedicated to professionals who prioritize uncompromising quality and cutting-edge cell technology, thus ensuring maximized profits and the fastest possible return on investment. ## Notable figures - Efficiency of 22.7% matches the \*\*HJT 700-750W\*\* median - Power density of 226.9 W/m² is 3.2 W/m² below \*\*HJT 700-750W\*\* median (230.2 W/m²) - needs more roof space - Temperature coefficient of -0.26%/°C matches the \*\*HJT 700-750W\*\* median - 90% bifaciality enables rear-side power generation, boosting yield by 4-14% on reflective surfaces - Ranked #3307 out of 14005 panels for efficiency in the database ## Questions ### What is HJT technology and why does the Seraphim Hydra series use it? HJT (Heterojunction Technology) combines crystalline silicon with a thin amorphous silicon layer, delivering module efficiency of around 23.5% — well above standard PERC or TOPCon panels. The Hydra series uses HJT because it minimizes power losses at high temperatures and ensures exceptionally low degradation over the full 30-year power warranty period. The result is higher energy yield per square meter of installed capacity. ### What does 90% bifaciality mean for the Seraphim Hydra, and how much extra energy can I expect? A 90% bifaciality rating means the rear side of the Hydra module captures 90% as much energy from reflected light as the front side — one of the highest figures available on the market. In real-world conditions with a bright ground surface (concrete, white gravel, or snow), the system can generate 10–20% more energy annually compared to a monofacial module of similar wattage. The gain is most significant in ground-mounted utility-scale farms and flat-roof commercial installations. ### What warranty comes with the Seraphim Hydra panels and what does it cover? Seraphim provides a 15-year product warranty covering material and workmanship defects, plus a 30-year linear power warranty. After 30 years, the Hydra module is guaranteed to retain at least 87.4% of its nominal power output — translating to a maximum annual degradation rate of approximately 0.4%. This low degradation is achievable thanks to the HJT cell technology's inherent resistance to PID and LID. ### Do Seraphim Hydra panels lose significant power during hot summer days? No — this is one of HJT's key advantages. The Hydra series has a low temperature coefficient of approximately -0.24%/°C, compared to -0.35%/°C for typical PERC modules. At a cell temperature of 70°C, the Hydra loses roughly 11% of its rated power, while a PERC panel would lose around 17%. In hot climates and large-scale utility farms, this difference results in measurably higher annual energy production and improved LCOE. ### What type of installation is the Seraphim Hydra best suited for, and can it be used on a residential rooftop? The Hydra series, with up to 730 Wp per module, is primarily designed for utility-scale farms and commercial installations where maximizing energy yield per square meter and minimizing LCOE are the top priorities. The large module format (approx. 2384×1303 mm, ~35 kg) requires compatible inverters and mounting structures. Residential rooftop use is possible provided the roof structure has adequate load-bearing capacity and the inverter is properly sized — consultation with a certified installer is strongly recommended. ### Is Seraphim a reliable manufacturer, and is the Hydra series still available to purchase? Seraphim Solar is a Bloomberg NEF Tier 1 manufacturer, confirming its financial stability and consistent production capacity. Founded in 2011, the company supplies modules to utility-scale projects worldwide. The Hydra series is currently active and available for purchase — it has not been discontinued. When buying, verify that you are purchasing through an authorized distributor to ensure full warranty support directly backed by the manufacturer. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/95c95bcd0293839ce21d2dc79fddb5e1-3bf353426b34.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | -25 W, lighter, +2.5 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | -30 W, lighter, +2.3 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | Lighter, +2.3 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | -10 W, lighter, +2.2 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | -35 W, lighter, +2.1 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | -35 W, lighter, +2.1 pp | | [Jinko Solar JKM650-670N-66QL6-BDV (670W class)](https://comparepv.com/panel/jinko-solar-jkm650-670n-66ql6-bdv-670w-class) | 670 W | -35 W, lighter, +2.1 pp | | [Seraphim SRP-645-BMC-BG](https://comparepv.com/panel/seraphim-srp-645-bmc-bg) | 645 W | -60 W, hotter, -1.9 pp | | [Seraphim SRP-650-BMC-BG](https://comparepv.com/panel/seraphim-srp-650-bmc-bg) | 650 W | -55 W, hotter, -1.8 pp | | [Seraphim SRP-655-BMC-BG](https://comparepv.com/panel/seraphim-srp-655-bmc-bg) | 655 W | -50 W, hotter, -1.6 pp | | [Seraphim SRP-660-BMC-HV](https://comparepv.com/panel/seraphim-srp-660-bmc-hv) | 660 W | Hotter, lighter, -1.4 pp | | [Seraphim SRP-665-BMC-HV](https://comparepv.com/panel/seraphim-srp-665-bmc-hv) | 665 W | Hotter, lighter, -1.3 pp | | [AIKO AIKO-A805-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a805-grh78dw) | 805 W | +100 W, heavier, +2.4 pp | | [AIKO AIKO-A800-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a800-grh78dw) | 800 W | +95 W, heavier, +2.2 pp | | [AIKO AIKO-A795-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a795-grh78dw) | 795 W | +90 W, heavier, +2.1 pp | | [AIKO AIKO-A790-GRH78Dw](https://comparepv.com/panel/aiko-aiko-a790-grh78dw) | 790 W | +85 W, heavier, +1.9 pp | --- Source: https://comparepv.com/panel/seraphim-srp-705-bhc-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.