ET1-3KR Rack-Mount Online UPS with Built-in LiFePO4
The ET1-3K platform in a 19-inch 2U rack chassis — lithium runtime and online protection for standardized server cabinets.
Product image
- Brand
- HighIdea
- Type
- Online double-conversion UPS (rack)
- Typical applications
- Server racks, data cabinets, network equipment, telecom rooms
- Models in range
- ET1KR, ET2KR, ET3KR
- Category
- UPS Power Supply
The ET1-3KR packs the ET platform's lithium online protection into a 19-inch rack chassis — the practical choice for server cabinets where floor space for tower units and battery racks simply doesn't exist. The built-in BMS communicates with the UPS controller, so battery health and remaining runtime are visible on the LCD and through the optional SNMP/cloud card.
Key Features
- 19-inch rack chassis (2U, 88 mm high) with built-in Class A LiFePO4 battery
- Online double conversion, zero transfer time, pure sine output
- DSP digital control and high-frequency PWM conversion
- Full-load backup without external battery cabinets — 30 minutes on ET1KR/ET2KR, 23 minutes on ET3KR
- Wide input voltage range (172–268 VAC) with lightning protection
- Output voltage selectable 220/230/240Vac, auto-adapting 50/60Hz
- RS-232 standard; optional SNMP/Modbus/dry contacts and cloud monitoring
Applications
Standardized server racks
Drops straight into 19-inch cabinets — lithium runtime without occupying the battery bay.
Edge & micro data centers
Compact footprint and remote monitoring options suit distributed, lightly-staffed sites.
Network core rooms
Protects core switches and routers with clean online power through grid disturbances.
FAQ
How many rack units does it occupy?
Can runtime be extended later?
Related Models
ET1-3K Series
Online double-conversion tower UPS with a Class A LiFePO4 battery inside — 30 minutes of full-load backup (23 minutes on ET3K) in one cabinet, maintenance-free.
View detailsET1-6KRS Series
1–6kVA online rack platform with modular lithium battery selection — choose the runtime by choosing the packs.
View detailsHC Rack-Mount Battery
A 19-inch chassis, 440 mm wide, with front terminals and a state-of-charge display — the format a telecom or IT technician already knows how to service.
View detailsSpecification reference
| Parameter | ET1KR | ET2KR | ET3KR |
|---|---|---|---|
| General | |||
| Rated output capacity | 1,000 VA / 900 W | 2,000 VA / 1,800 W | 3,000 VA / 2,700 W |
| Working mode | Online double conversion | ||
| Control | DSP digital control + high-frequency PWM | ||
| Form factor | 19-inch rack, 2U | ||
| AC input | |||
| Nominal voltage | 220 VAC (230 / 240 VAC selectable) | ||
| Nominal frequency | 50/60 Hz auto-sensing | ||
| Input voltage range | 172–268 VAC (±7 VAC) | ||
| Input frequency range | 45–55 Hz / 55–65 Hz (±0.5 Hz) | ||
| Battery | |||
| Nominal battery voltage | 24 V | 48 V | 48 V |
| Cell type | Class A LiFePO4 | ||
| Cell string | 8S | 16S | 16S |
| Built-in capacity | 460.8 Wh | 921.6 Wh | 1,228.8 Wh |
| Battery life | Float life 10+ years; 1,200+ cycles | ||
| Cell protection | Per-cell over-charge, over-discharge, imbalance, over-current, short-circuit | ||
| Cell balancing | Yes | ||
| Fuel-gauge management | Yes | ||
| Low-voltage alarm / shutdown | 22 V / 21–30 V | 44 V / 42–60 V | 44 V / 42–60 V |
| Charge voltage | 28.8 ±0.2 V | 57 ±0.3 V | 57 ±0.3 V |
| Charge current | 2 A | 3 A | 3 A |
| Charging method | Constant current, then constant voltage | ||
| Recharge time | 8 h to 90% | ||
| Backup time | 50 min half load / 30 min full load | 50 min half load / 30 min full load | 42 min half load / 23 min full load |
| AC output | |||
| Output voltage | 220 VAC ±3% (230 / 240 VAC selectable) | ||
| Output frequency | 50/60 Hz ±5 Hz on mains; ±1% on battery | ||
| Dynamic voltage transient | <5% | ||
| Transient recovery time | <60 ms | ||
| Waveform | Pure sine wave; THD <3% linear, <8% non-linear | ||
| Output power factor | 0.8 | ||
| Overload capacity | 130% ≥20 s on mains; 120% ≥20 s on battery | ||
| Peak current factor | 3:1 | ||
| Transfer time (mains ↔ battery) | 0 ms | ||
| Transfer time (inverter ↔ bypass) | <4 ms | ||
| Communication & protection | |||
| Communication | RS-232 standard; optional RS-485 (Modbus), dry contacts, SNMP | ||
| Protection | Battery over/under-voltage, overload, over-temperature, short circuit, output over/under-voltage | ||
| Mechanical | |||
| Net weight | 9.5 kg | 20.6 kg | 23 kg |
| Net dimensions (W × H × D) | 440 × 88 × 310 mm | 440 × 88 × 540 mm | 440 × 88 × 540 mm |
| Packaging dimensions (W × H × D) | 538 × 190 × 402 mm | 538 × 168 × 660 mm | 538 × 168 × 660 mm |
| Environment | |||
| Operating temperature | −10 °C to +40 °C | ||
| Operating humidity | 20–90% RH, non-condensing | ||
| Altitude | No derating below 1,000 m; −1% per 100 m above | ||
Specifications subject to the latest factory data. Final configuration is sized against the actual load, backup runtime and site power conditions — this table is for pre-selection only.