With a modern high-density design and advanced technological features, the Sentinel Dual2 represents the new generation of double-conversion UPS systems from Riello UPS. Developed by the Research & Development Department, it delivers top performance, installation flexibility, and reduced operating costs, fully meeting the needs of modern IT and industrial applications.
The Sentinel Dual2 uses ON LINE double conversion technology, ensuring maximum protection and reliability for critical loads such as servers, storage systems, networks, VoIP equipment, and medical systems. With a power factor of 1 and high efficiency, it is an ideal solution for demanding environments.
For applications requiring extended runtime, autonomy can be increased up to several hours using ER versions and external battery cabinets.
The front panel includes an LCD display showing key parameters (input/output voltage, battery status), while the LED status bar provides immediate operating information.
ACE Power Electronics – Official Riello UPS Distributor in Greece

The Sentinel Dual2 supports both tower and 19” rack installation, offering flexibility for any environment. It allows runtime expansion through external battery cabinets and supports options for increased battery charging current.
Additionally, it includes energy-saving operating modes and EnergyShare output sockets for automatic load management.
Ensures the operation of critical systems such as emergency lighting, fire detection systems, and alarms. In case of a power failure, the inverter starts supplying the load with Soft Start technology to prevent overload.
Thanks to high-frequency components and load-controlled fan speed, the noise level is kept below 40 dBA.
2-year warranty included.
| MODELS | SD2 1000 | SD2 1500 | SD2 2200 | SD2 2200 ER | SD2 3000 | SD2 3000 ER |
| POWER | 1000VA/ 1000W | 1500VA/1500W | 2200VA/2200W | 3000VA/3000W | ||
| INPUT | ||||||
| Rated voltage | 220 / 230 / 240 VAC | |||||
| Voltage range without
battery intervention |
140 – 276 VAC @ 50% LOAD / 184 – 276 VAC @ 100% LOAD | |||||
| Maximum permitted voltage | 300 VAC | |||||
| Rated frequency | 50 / 60 ±5 Hz | |||||
| Frequency tolerance | 50 ±5% / 60 ±5% Hz | |||||
| Power factor | 1 | |||||
| Current distortion | ≤5,2 | |||||
| BYPASS | ||||||
| Configurable Voltage range | 180-264 VAC | |||||
| Frequency tolerance | Configurable: 3% ÷ 10% | |||||
| OUTPUT | ||||||
| Voltage distortion with linear load / with non-linear load | < 2% / < 3,5% | |||||
| Frequency | Selectable: 50 Hz or 60 Hz or self-learning | |||||
| Static variation | ±1% | |||||
| Dynamic variation | ≤5% in 20 ms | |||||
| Waveform | Sinusoidal | |||||
| Current crest factor | 3:1 | |||||
| Efficiency ECO and SMART
ACTIVE Modes |
98% | |||||
| Overload times | <150% for 4 s, 150% for 1 s | |||||
| BATTERIES | ||||||
| Type | VRLA AGM maintenance-free lead based | |||||
| Recharge time | 2-4 h | – | 2-4 h | – | ||
| OVERALL SPECIFICATIONS | ||||||
| Net weight [kg] | 15 | 16 | 24.8 | 12.5 | 27.2 | 12.7 |
| Gross weight [kg] | 18.5 | 19.5 | 28.8 | 16.5 | 31.2 | 16.7 |
| Dimensions (WxDxH) (mm) | (T- 87x425x450)
(R- 19”x425x2U) |
(T- 87x625x450) (R- 19”x625x2U) | ||||
| Packaging dimensions (WxDxH) (mm) | 550x600x245 | 600x760x245 | ||||
| Overvoltage protection | 300 joules | |||||
| Protections | Overcurrent – short circuit – overvoltage – undervoltage – temperature – excessive low battery | |||||
| Communications | USB / RJ45 with RS232 and contacts / Slot for communications interface | |||||
| Input plugs | 1x IEC 320 C14 (10 A) | 1x IEC 320 C20 (16 A) | ||||
| Output sockets | 8x IEC 320 C13 (10 A) | 8x IEC 320 C13 (10 A) + 1x IEC 320 C19 (16 A) | ||||
| Standards | European directives: LV 2014/35/EU low voltage Directive EMC 2014/30/EU electromagnetic compatibility Directive Standards: Safety IEC EN 62040-1; EMC IEC EN 62040-2; RoHS compliant Classification in accordance with IEC 62040-3 (Voltage Frequency Independent) VFI – SS – 111 | |||||
| Ambient temperature for the UPS | 0 – 40 ° C | |||||
| Range of relative humidity | 5-95% non-condensing | |||||
| Colour | RAL 9005 | |||||
| Noise level at 1 m (ECO Mode) | < 40 dBA | |||||
| Standard equipment provided | Power cable, serial cable, USB cable, safety manual, quick start guide | |||||