--- title: "Renewsys DESERV EXTREME 156X-640 640W Solar Panel - Specs & Review | ComparePV" description: "Renewsys DESERV EXTREME 156X-640 640W solar panel. Specs: 22.94% efficiency, Monocrystalline cells, dimensions, warranty and temperature coefficient." source: "https://comparepv.com/panel/renewsys-deserv-extreme-156x-640" updated: 2026-09-11 --- # Renewsys DESERV EXTREME 156X-640 Solid all-round for its segment 1,086 panels in the segment TOPCon 600-650 W ## Identity - **Manufacturer:** Renewsys - **Model:** DESERV EXTREME 156X-640 - **Series:** DESERV Extreme 156X - **Rated power:** 640 W - **Cell technology:** TOPCon - **Bifacial:** yes ## How it compares Compared against segment TOPCon 600-650 W (1086 panels). | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Power (Wp) | 640 W | 620 W | Strong - top 9% | | | Module efficiency | 22.94% | 22.80% | Typical | 2,334 | | Power density | 229.4 | 227.7 | Typical | 2,332 | | Temperature coefficient | -0.292 | -0.290 | Typical | 6,056 | | Weight (kg) | 34.5 kg | 32.7 kg | Typical | | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | ### Full peer table | Measure | This panel | Segment median | Standing | Rank | | --- | --- | --- | --- | --- | | Module efficiency | 22.94% | 22.80% | Typical | 2,334 | | Power density | 229.4 | 227.7 | Typical | 2,332 | | Temperature coefficient | -0.292 | -0.290 | Typical | 6,056 | | Weight per kWp | 53.9 | 53.1 | Typical | 8,037 | | Performance warranty | 30 yrs | 30 yrs | Typical | 21 | - **Best for:** Commercial, utility-scale and shaded-installations. ## Specification ### Electrical - **Rated power (Pmax):** 640 W - **Efficiency:** 22.94 % - **Voltage at Pmax (Vmp):** 46.98 V - **Current at Pmax (Imp):** 13.63 A - **Open-circuit voltage (Voc):** 57.08 V - **Short-circuit current (Isc):** 14.29 A - **Max system voltage:** 1500 V ### Temperature - **Temperature coefficient of Pmax:** -0.292 %/degC - **Temperature coefficient of Voc:** -0.276 %/degC - **Temperature coefficient of Isc:** 0.057 %/degC - **NOCT:** 45 degC ### Cell and construction - **Cell type:** Monocrystalline - **Cell technology:** TOPCon - **Cell count:** 156 - **Bifacial:** yes - **Bifacial gain:** 20.00 ### Physical - **Length:** 2462 mm - **Width:** 1133 mm - **Thickness:** 35 mm - **Weight:** 34.5 kg - **Area:** 2.79 m2 - **Power density:** 229.4 Wp/m2 ### Warranty and degradation - **Product warranty:** 12 years - **Performance warranty:** 30 years ## Rank in the whole catalogue | Measure | Position | | --- | --- | | Efficiency | 2334 of 14005 | | Power density | 2332 of 14005 | | Temperature coefficient | 6056 of 14005 | | Weight | 8037 of 14005 | | Warranty | 21 of 14005 | ## About this series The **RenewSys DESERV Extreme 156X** series answers the growing demand from commercial projects and utility-scale PV farms for modules delivering maximum power density per unit area. The panels rely on **N-type TOPCon cells in a half-cut configuration**, which improves resistance to microcracks and reduces losses under partial shading compared to conventional PERC modules. The **glass-glass, bifacial construction** captures light reflected from the ground, boosting energy yield without expanding the installation footprint - directly lowering LCOE over the system's full lifecycle. The large-format 156X wafer paired with a multi-busbar grid improves current collection and reduces series resistance across the cell string. Backed by a durable anodized aluminum frame and a sealed IP68 junction box with bypass diodes, the modules maintain stable performance across a wide temperature range and demanding weather conditions. This series suits both rooftop installations on industrial facilities and large-scale ground-mounted projects, where every percentage point of output matters, along with predictable long-term power degradation backed by an extended manufacturer warranty. ## Notable figures - Efficiency of 22.9% matches the \*\*TOPCon 600-650W\*\* median - Power density of 229.4 W/m² matches the \*\*TOPCon 600-650W\*\* median - At -0.29%/°C, hot weather performance is typical for \*\*TOPCon 600-650W\*\* panels - At 34.5 kg (1.8 kg above \*\*TOPCon 600-650W\*\* median of 32.7 kg), requires checking roof load capacity - 80% bifaciality enables rear-side power generation, boosting yield by 4-12% on reflective surfaces ## Questions ### How does the RenewSys DESERV Extreme 156X series differ from classic PERC panels? The DESERV Extreme 156X uses N-type TOPCon cells instead of standard P-type PERC cells. This results in higher efficiency, a lower annual degradation rate, and better resistance to LID and PID. In practice, this means higher energy yield over the system's lifetime and more stable performance at elevated temperatures compared to PERC modules. ### Do the bifacial DESERV Extreme 156X panels actually increase energy production? Yes, the glass-glass construction allows the rear side of the module to capture light reflected from the roof, ground, or surrounding surfaces. Depending on the albedo of the surroundings and mounting height, the additional energy gain can range from a few to over ten percent without increasing the installation's footprint, directly lowering LCOE over the system's lifetime. ### What warranty comes with RenewSys DESERV Extreme 156X panels? The manufacturer offers a 12-year product warranty covering material and workmanship defects, plus a 30-year linear power output warranty. This ensures predictable, gradually declining performance over three decades, which matters for return-on-investment planning in commercial installations and utility-scale PV farms. ### Is it worth choosing 650 Wp modules for a utility-scale PV farm? The up-to-650 Wp output of the DESERV Extreme 156X series delivers higher power density per unit of roof or ground area, reducing the number of panels required, cabling length, and mounting structure costs. For large industrial and utility-scale installations, this translates into lower BoS (Balance of System) costs per installed kW. ### Is RenewSys a tier 1 manufacturer, and where are DESERV Extreme 156X panels made? RenewSys holds tier 1 manufacturer status, confirming the company's financial stability and experience in large-scale PV module production. Its manufacturing facilities are located in India, where the company runs vertically integrated production from cells to finished modules, enabling tighter quality control at every stage. ### Can the junction box and frame of the DESERV Extreme 156X handle harsh weather conditions? Yes, the modules feature an IP68-rated junction box with bypass diodes, protecting against moisture and cell overheating under partial shading. The sturdy anodized aluminum frame provides mechanical rigidity and resistance to snow and wind loads, making the series suitable for both industrial rooftops and ground-mounted installations. ## Datasheet [Manufacturer datasheet (PDF)](https://comparepv.com/datasheets/e121d2_b8f15caf1c814a54b7463d158e5c281f-1d39f69a9ade.pdf) ## Alternatives | Panel | Power | How it differs | | --- | --- | --- | | [AIKO AIKO-A650-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a650-mae72mw) | 650 W | Cooler, lighter, +2.3 pp | | [AIKO AIKO-A680-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a680-mde72mw) | 680 W | +40 W, lighter, +2.3 pp | | [AIKO AIKO-A675-MDE72Mw](https://comparepv.com/panel/aiko-aiko-a675-mde72mw) | 675 W | +35 W, lighter, +2.1 pp | | [AIKO AIKO-A645-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a645-mae72mw) | 645 W | Cooler, lighter, +2.1 pp | | [AIKO AIKO-G670-MCH72Mw](https://comparepv.com/panel/aiko-aiko-g670-mch72mw) | 670 W | Cooler, lighter, +1.9 pp | | [Longi Solar LR7-72HVHF-670M](https://comparepv.com/panel/longi-lr7-72hvhf-670m) | 670 W | Cooler, lighter, +1.9 pp | | [AIKO AIKO-A640-MAE72Mw](https://comparepv.com/panel/aiko-aiko-a640-mae72mw) | 640 W | Cooler, lighter, +1.9 pp | | [Renewsys DESERV EXTREME 156X-615](https://comparepv.com/panel/renewsys-deserv-extreme-156x-615) | 615 W | -25 W, -0.9 pp | | [Renewsys DESERV EXTREME 156X-620](https://comparepv.com/panel/renewsys-deserv-extreme-156x-620) | 620 W | -20 W, -0.7 pp | | [Renewsys DESERV EXTREME 156X-625](https://comparepv.com/panel/renewsys-deserv-extreme-156x-625) | 625 W | -15 W, -0.5 pp | | [Renewsys DESERV EXTREME 156X-630](https://comparepv.com/panel/renewsys-deserv-extreme-156x-630) | 630 W | -10 W, -0.4 pp | | [Renewsys DESERV EXTREME 156X-635](https://comparepv.com/panel/renewsys-deserv-extreme-156x-635) | 635 W | Very close match | | [Renewsys DESERV EXTREME 156X-645](https://comparepv.com/panel/renewsys-deserv-extreme-156x-645) | 645 W | Very close match | | [Renewsys DESERV EXTREME 156X-650](https://comparepv.com/panel/renewsys-deserv-extreme-156x-650) | 650 W | +10 W, +0.4 pp | | [AIKO AIKO-A700-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a700-mae78dw) | 700 W | +60 W, cooler, +2.1 pp | | [AIKO AIKO-A695-MAE78Dw](https://comparepv.com/panel/aiko-aiko-a695-mae78dw) | 695 W | +55 W, cooler, +2.0 pp | --- Source: https://comparepv.com/panel/renewsys-deserv-extreme-156x-640 Not in this file, on the page: a thirty-year output simulator, a bifacial gain calculator and alternatives filtered by how closely they match these dimensions.