ET1-3K Tower Online UPS with Built-in LiFePO4
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.
Product image
- Brand
- HighIdea
- Type
- Online double-conversion UPS (tower)
- Typical applications
- Servers, workstations, medical devices, labs, network core equipment
- Models in range
- ET1K, ET2K, ET3K
- Category
- UPS Power Supply
The ET1-3K series is the flagship of HighIdea's lithium UPS line: a true online double-conversion UPS with a Class A LiFePO4 battery integrated in the tower cabinet. Where a lead-acid system needs an external battery rack to reach 30 minutes of full-load backup, the ET1-3K does it in a single box roughly one-third the size.
The battery management system is engineered for high-current charging and full cell balancing, eliminating the low-current protection shutdowns that affect generic lithium conversions. All cells are new-production Class A — never second-life cells.
Key Features
- Built-in Class A LiFePO4 battery — 460.8 Wh (ET1K) to 1,228.8 Wh (ET3K), 1,200+ cycles, 10+ years float-charge life
- True online double conversion with zero-millisecond transfer between mains, battery and bypass
- Full-load backup without external battery cabinets — 30 minutes on ET1K/ET2K, 23 minutes on ET3K
- DSP digital control with high-frequency PWM for stable, precise output
- Wide input range (172–268 VAC) with three/four-level lightning protection for harsh grids
- Active input power factor correction (PFC) — clean to the grid, low operating cost
- Output voltage selectable 220/230/240Vac, auto-adapting 50/60Hz
- Automatic power-on after outage recovery — suitable for unattended sites
- RS-232 standard; optional SNMP/Modbus/dry contacts and cloud IoT monitoring
Applications
Office servers & workstations
One tower unit keeps the server, switch and workstations alive through outages — no separate battery cabinet needed.
Medical & laboratory equipment
Zero-transfer online protection for devices that cannot tolerate any interruption or waveform distortion.
Unattended & remote sites
Automatic power-on after recovery and cloud monitoring support make it fit for base stations and remote rooms.
FAQ
How long does it run at full load?
Is the battery replaceable or maintenance-free?
Can the output voltage be set to my market standard?
Related Models
ET1-3KR Series
The ET1-3K platform in a 19-inch 2U rack chassis — lithium runtime and online protection for standardized server cabinets.
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 | ET1K | ET2K | ET3K |
|---|---|---|---|
| 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 | Tower | ||
| 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 | 8–10 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 | 8.6 kg | 19.6 kg | 22 kg |
| Net dimensions (W × H × D) | 145 × 220 × 355 mm | 190 × 318 × 433 mm | 190 × 318 × 433 mm |
| Packaging dimensions (W × H × D) | 442 × 251 × 363 mm | 560 × 340 × 485 mm | 560 × 340 × 485 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.