Zero Transfer Time UPS - ICONICA 6kW 48V Inverter-Charger and 4x Fogstar 3.84kWh 12V LiFePO4 Batteries

  
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Zero Transfer Time UPS – ICONICA 6kW 48V Inverter-Charger with 4 × Fogstar Drift 3.84kWh LiFePO4 Batteries

  • Keep selected business equipment powered during a mains outage, with 0ms transfer from AC mode to battery mode when correctly configured.
  • Supply up to 6,000W of continuous pure sine wave power from a lithium battery bank with 15.36kWh nominal storage.
  • Built-in inverter Wi-Fi, battery Bluetooth monitoring and an integrated MPPT controller supporting up to 6,000W of compatible solar input.

6kW zero transfer time UPS with Fogstar lithium storage

This zero transfer time UPS pairs an ICONICA IC2-ZT6000-48 inverter-charger with four Fogstar Drift 12.8V 300Ah LiFePO4 batteries. Connected in series, the batteries form a 51.2V nominal, 300Ah bank for a 48V-class system. The package is intended for professionally designed essential-load circuits, with final battery compatibility and commissioning settings confirmed before installation.

This inverter has the ability to be connected in parallel with additional identical units (maximum of 8 further inverters), offering the possibility of large-scale system expansion, with up to 54kW of power handling capability and up to 138.24kWh battery storage capacity. Once connected in parallel, there is the option for 3-phase operation (ideal if the system is being used to power industrial grade equipment and machinery run on 3 phase). Each inverter connected in the system will require a parallel connection kit (sold separately).

Key features

  • Continuity for sensitive loads: 0ms AC-to-battery transfer. Inverter-to-bypass transfer is typically 4ms, so operating-mode selection matters.
  • 6kVA/6kW pure sine wave output: suitable for assessed single-phase essential loads within the inverter and battery limits.
  • 15.36kWh nominal lithium storage: four Fogstar Drift 300Ah batteries, each rated at 3,840Wh, with individual battery management systems.
  • Flexible charging: up to 120A solar charging or 120A mains charging, with the combined charging limit configured for the battery bank.
  • Separate monitoring: inverter Wi-Fi monitoring and Fogstar battery Bluetooth monitoring. Direct battery-to-inverter BMS communication is not assumed.

Where to use

Consider this system for assessed essential-load circuits serving logistics offices, commercial workstations, network equipment, CCTV recorders, access control and selected small-server installations. Check total running power, starting loads and the required backup duration before specifying the package.

This is a single-phase system for selected circuits, not a complete factory or warehouse backup supply. Specialist medical, life-safety and other critical applications require a separate suitability assessment.

System contents and installation

  • 1 × ICONICA IC2-ZT6000-48 6kW 48V-class zero transfer time inverter-charger.
  • 4 × Fogstar Drift 12.8V 300Ah LiFePO4 batteries, using the 250A-BMS configuration specified for this draft.
  • 1 x Mersen DC Fused Disconnect 2-pole NH1 fuse size 250ADC max
  • Required cables, battery interlinks, fuses, AC protection and any enclosure included.

This system is not ready to use straight out of the box. A qualified electrician must design the battery connections, protection, isolation, earthing and essential-load circuits. Ask Energian about installation through trusted partners.

Fogstar permits up to four of these Drift batteries in series. Before assembly, confirm the exact supplied battery revision, follow Fogstar’s initial charging and balancing procedure, and verify ICONICA operation with the proposed battery bank. 

Set charging voltage, charge-current limits and low-voltage protection for the Fogstar batteries; do not use an AGM profile by default. Disable lead-acid equalisation and do not select a communications-based lithium profile unless the battery protocol and wiring are confirmed compatible.

The 15.36kWh figure is nominal stored DC energy, not guaranteed usable AC energy. Runtime depends on load, inverter consumption, operating limits, temperature and battery condition. A BMS protection trip can interrupt supply even though the inverter’s normal AC-to-battery transfer is specified at 0ms.

Technical specifications

Inverter figures below follow the supplied IC2-ZT6000-48 datasheet. Battery figures follow the Fogstar Drift 12V 300Ah 250A specification. Calculated bank figures are identified separately. Different Fogstar generations must not be substituted without checking their specifications.

Specification Value
System configuration
Inverter model ICONICA IC2-ZT6000-48
Inverter output rating 6,000VA / 6,000W
Battery model used for this draft Fogstar Drift 12V 300Ah, 250A-BMS configuration
Battery quantity 4
Battery chemistry Lithium iron phosphate, LiFePO4
Bank configuration Four batteries in series; one 48V-class string
Nominal voltage per battery 12.8V
Nominal bank voltage — calculated 51.2V
Nominal capacity per battery 300Ah
Nominal energy per battery 3,840Wh / 3.84kWh
Nominal bank energy — calculated 15,360Wh / 15.36kWh
Nominal energy at an 80% discharge allowance — calculated 12.288kWh before inverter losses and operating restrictions
Battery-only weight — calculated 104kg, using 26kg per battery
Combined component weight — calculated 119kg using the inverter datasheet weight; excludes cables, protection devices, enclosure and packaging
Inverter: grid input
Nominal input voltage 230V AC
Input voltage range 110–280V AC
Input frequency 50Hz / 60Hz, automatic sensing, ±4Hz
Input power factor ≥0.98 at nominal voltage and 100% load
Input-current total harmonic distortion, THDi ≤10%
Input and charging priorities Configurable AC/solar priority through the LCD settings
Inverter: AC output and transfer
Output waveform Pure sine wave
AC voltage regulation, line and battery modes 230V AC ±5%
Synchronised frequency range 46–54Hz or 56–64Hz
Battery-mode output frequency 50Hz ±0.1Hz or 60Hz ±0.1Hz
Output harmonic distortion with linear load ≤3% THD
Output harmonic distortion with non-linear load ≤5% THD
AC-mode to battery-mode transfer 0ms
Inverter-to-bypass transfer 4ms typical
Zero-transfer qualification Applies to the specified AC-to-battery transition;
Inverter efficiency
Line-mode efficiency 94%
ECO-mode efficiency 98%
Battery-mode efficiency 92%
Inverter: battery and charging
Battery-voltage range 40–62V DC
Listed floating charge voltage 54V DC
Overcharge protection 62V DC
Maximum AC charging current 120A
Maximum solar charging current 120A
Combined charging-current setting 10–120A in 10A increments. 
User-defined bulk and float adjustment 48.0–64.0V in 0.1V increments. 
User-defined low-voltage cut-off adjustment 40.0–54.0V in 0.1V increments.
Battery equalisation Disable for this LiFePO4 system
Inverter: solar input
Solar charger type MPPT
Maximum PV array power 6,000W
MPPT operating-voltage range 120–430V DC
Maximum PV array open-circuit voltage 500V DC
Maximum solar input current 27A
Solar panels Not assumed included; specify a compatible array separately
Inverter: monitoring, physical and environmental data
Control module Removable LCD
Built-in wireless monitoring Wi-Fi
Monitoring application WatchPower
Communication interfaces listed RS232, USB, dry contact, Wi-Fi, RS485 and CAN
Battery communications qualification RS485/CAN interfaces do not establish compatibility with Fogstar Drift. No direct communications integration is claimed.
Dimensions, D × W × H 135.5 × 300 × 500mm
Net weight 15kg
Operating temperature −10°C to +50°C
Storage temperature −15°C to +60°C
Relative humidity 5–95%, non-condensing
Fogstar Drift 300Ah: per-battery specifications
Cell type Grade A EVE LF304K prismatic cells
Internal cell configuration 4S1P
Nominal capacity 300Ah
Nominal voltage 12.8V
Rated energy 3,840Wh
Published cycle life 4,500 cycles at 80% depth of discharge
Maximum continuous discharge 250A 
Maximum charging current 250A
Discharge cut-off voltage 10V per battery
Recommended charging voltage 14.4V per battery
Four-battery charging-voltage equivalent — calculated 57.6V
Discharge-temperature range −20°C to +60°C
Charging-temperature range in specification sheet −20°C to +60°C with heater enabled. 
Storage conditions 10°C to 35°C at approximately 50% state of charge
Integrated heating Built-in heater; the specification sheet states heating to 5°C to enable low-temperature charging
Battery monitoring Bluetooth through the Fogstar Drift application
BMS protections listed Temperature, overcurrent and overdischarge protection
Case material ABS plastic
Dimensions, L × W × H 380 × 190 × 245mm
Weight 26kg
Terminal specification M8, 1.25mm pitch, 12mm; bolts supplied
Conformity designations listed in battery sheet UN38.3, RoHS, CE and UL. 
System integration requirements
Manufacturer series allowance Fogstar permits up to 4 of these Drift batteries in series.
Initial preparation Follow Fogstar’s charging and balancing procedure before series connection

Documents available for download

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UK expert support

Energian’s UK team can help assess essential loads, backup capacity, battery compatibility, solar design and installation requirements. Contact us by phone, email or live chat with questions or support requests, or arrange an in-person consultation at our office.