ET Series 1–10KRS Rack Online UPS, External Lithium Battery
Long-duration online protection — external LiFePO4 battery racks scale runtime from minutes to hours for 1–10kVA loads.
Product image
- Brand
- HighIdea
- Type
- Online double-conversion UPS (rack, long-duration)
- Typical applications
- Data racks, servers, medical systems, long-runtime requirements
- Models in range
- ET1KRS, ET2KRS, ET3KRS, ET6KRS, ET10KRS
- Category
- UPS Power Supply
For sites that need hours rather than minutes of backup, the ET 1–10KRS pairs the online ET platform with external LiFePO4 battery racks. Runtime scales linearly with pack count, and lithium's fast recharge restores full autonomy quickly after each outage.
The specification table above lists the 1–6 kVA models as published in the factory manual. The 10 kVA model (ET10KRS) is configured to order — contact us for its current datasheet before final sizing.
Key Features
- Rack-mounted online UPS engineered for long-duration external lithium batteries
- Dual-conversion online design with pure sine wave output
- High-frequency architecture — compact and efficient versus power-frequency alternatives
- 1–10kVA single range covers small server rooms to full racks
- Battery management tuned for LiFePO4 fast-charge characteristics
- Optional SNMP / Modbus / cloud monitoring
Applications
Long-runtime data racks
Where generators are absent or slow to start, hours of lithium-backed autonomy keep racks online.
Medical & lab systems
Clean online power with runtime scaled to the procedure schedule, not the battery chassis.
FAQ
How do I size the battery for a runtime target?
Can it mix with lead-acid batteries?
Related Models
ET1-6KRS Series
1–6kVA online rack platform with modular lithium battery selection — choose the runtime by choosing the packs.
View detailsET6/10KRS PRO Series
6–10kVA online rack UPS purpose-engineered for long-duration lithium backup — single-phase or three-phase input, single-phase output.
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 | ET1KRS | ET2KRS | ET3KRS | ET6KRS |
|---|---|---|---|---|
| General | ||||
| Rated output capacity | 1,000 VA / 900 W | 2,000 VA / 1,800 W | 3,000 VA / 2,700 W | 6,000 VA / 5,400 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 (external) | ||||
| Nominal battery voltage | 48 V | |||
| Cell type | Class A LiFePO4 | |||
| Cell string requirement | 15S / 16S (15S factory default) | |||
| External pack capacity required | >10 Ah | >20 Ah | >30 Ah | >50 Ah |
| Battery life | Float life 10+ years; 1,200+ cycles | |||
| Cell protection | Provided by the external pack BMS | |||
| Cell balancing | Provided by the external pack BMS | |||
| Fuel-gauge management | Configured to the installed pack | |||
| Low-voltage alarm / shutdown | 44 V / 42–60 V | |||
| Charge voltage | 54 ±0.3 V | |||
| Charge current | 5 A | 5 A | 5 A | 5 A default, expandable to 10–30 A |
| Charging method | Constant current, then constant voltage | |||
| Backup time | Determined by the connected pack capacity | |||
| 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 | 6.5 kg | 9.5 kg | 10 kg | 14 kg |
| Net dimensions (W × H × D) | 440 × 88 × 310 mm | 440 × 88 × 440 mm | 440 × 88 × 440 mm | 440 × 88 × 500 mm |
| Packaging dimensions (W × H × D) | 538 × 190 × 402 mm | 538 × 168 × 538 mm | 538 × 168 × 538 mm | 538 × 168 × 600 mm |
| Environment | ||||
| Operating humidity | 20–90% RH, non-condensing | |||
| Altitude | No derating below 1,000 m; −1% per 100 m above | |||
| Storage temperature | −40 °C to +45 °C | |||
| Storage humidity | 20–90% RH, non-condensing | |||
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.