The Voltrix C3K-Li (Tower) and R3K-Li (Rack 2U) are 3 kVA / 3 kW high-frequency online double-conversion (VFI) UPS systems built on an internal 16-cell LiFePO4 battery pack (51.2 V, 1,229 Wh). LiFePO4 chemistry delivers up to 3× the backup time of a comparable lead-acid UPS in a lighter, more compact footprint, with a service life exceeding 2,000 charge/discharge cycles. Rated backup > 20 min @ Full Load.
DSP digital control, active input power factor correction (≥ 0.99) and a wide 90 ~ 300 VAC input window make the pair fully compatible with generator sets and unstable grids. Dry contact and MODBUS (RS485) interfaces give direct BMS integration, and the 4-state lithium charger (CC / CV / Floating / Turn-off) can be customised to the battery pack. Both form factors share identical electrical performance — choose Tower for desktop or floor placement, or the 2U Rack model for standard 19-inch cabinets.
Technical Specifications — C3K-Li / R3K-Li — 3 kVA / 3 kW
| AC INPUT | |
|---|---|
| Wiring | L/N + PE |
| Rated Voltage | 208/220/230/240 VAC |
| Voltage Range | 90 ~ 300 VAC |
| Frequency Range | 40 Hz ~ 70 Hz |
| Input Power Factor | ≥ 0.99 |
| AC OUTPUT | |
| Wiring | L/N + PE |
| Output Voltage | 208/220/230/240 VAC |
| Voltage Regulation | ± 1% |
| Output Frequency | 50/60 Hz ±4 Hz (Sync) 50/60 Hz ±0.1 (Free run) |
| Waveform | Pure Sine Wave |
| THDv (Lin. / Non-lin.) | < 2% / < 8% |
| Overload Capability | 100~105%: continuous 105~130%: 60 sec |
| 130~150%: 10 sec >150%: 0.3 sec | |
| EFFICIENCY | |
| Line Mode | 92% |
| Battery Mode | 89% |
| LITHIUM BATTERY & CHARGER | |
| Rated Battery Voltage | 51.2 / 48 VDC (16-cell LiFePO4) |
| Battery Capacity | 1,229 Wh |
| Backup Time | > 20 min @ Full Load |
| Charging Current | 4A / 8A / 12A / 16A |
| Charging Voltage | 56.8 V (default, 16-cell) Customisable on request |
| Charger Behaviour | CC · CV · Floating · Turn-off (4-state) |
| Protection | 3 over-voltage loop, over-temp / over-pressure interface |
| PHYSICAL | |
| Tower Dim. W×D×H (mm) | 190×415×323 (Std) 190×368×323 (Ext. Bat.) |
| Rack Dim. W×H×D (mm) | 440×612×88 (2U) |
| Tower Net Weight (kg) | 20.4 / 9.3 |
| Rack Net Weight (kg) | 20.9 / 8.9 |
Key Features
- Online double-conversion (VFI) topology — 0 ms transfer, pure sine wave output
- LiFePO4 lithium battery, 16-cell (51.2 V) — more than 2,000 charge/discharge cycles
- Up to 3× backup time vs. a comparable lead-acid UPS, at a fraction of the weight
- Wide input range 90 ~ 300 VAC, 40 Hz ~ 70 Hz — generator compatible, cold start and ECO mode
- Active input power factor correction ≥ 0.99
- Efficiency: line mode 92%, battery mode 89%
- 4-state lithium charger (CC / CV / Floating / Turn-off), charging current 4A / 8A / 12A / 16A
- 50/60 Hz auto-sensing and frequency-converter mode
- RS232 standard; optional USB (1–3 kVA), SNMP / TCP-IP network card for remote monitoring, dry contact for BMS dominant control and MODBUS (RS485) card for BMS integration
Ordering Information
| Voltrix Model | Form Factor | Apparent / Active Power | Battery | Part Number |
|---|---|---|---|---|
| C3K-Li | Tower | 3 kVA / 3 kW | 16-cell LiFePO4 (51.2V) | VTX-C3K-Li |
| R3K-Li | Rack 2U | 3 kVA / 3 kW | 16-cell LiFePO4 (51.2V) | VTX-R3K-Li |
Downloads
Certifications & Warranty
Designed and manufactured under ISO 9001:2015. CE (EU Declaration of Conformity), IEC/EN 62040-1 (UPS Safety), IEC/EN 62040-2 (UPS EMC — Class C2), RoHS 2011/65/EU. 2-year UPS system warranty, return-to-base, parts and labour; LiFePO4 battery warranty 2 years or 2,000 full charge-discharge cycles, whichever occurs first. 24/7 technical support with response within 4 hours.
Specifications subject to change without notice. Battery cycle life and backup time are indicative and may vary with operating temperature, load profile and discharge history. Voltrix is a registered brand of Heizka. All trademarks are property of their respective owners.
