Zero Transfer Time UPS - ICONICA 3kW 24V Inverter-Charger and 4x2kWh 6V Rolls AGM Batteries
Zero Transfer Time UPS – ICONICA 3kW 24V Inverter-Charger & 4 × Rolls 2kWh 6V AGM Batteries
- Keep selected home & business equipment running during a mains outage, with 0ms transfer time between grid and battery modes.
- Supply up to 3,000W of continuous pure sine wave power from a 24V AGM battery bank.
- Four Rolls batteries provide 8.04kWh nominal storage at the 20-hour rate, with mains charging and an integrated solar charge controller.
Backup power for essential business loads
This zero transfer time UPS system combines an ICONICA IC-ZT3000-24 inverter-charger with four Rolls S6-370AGM deep-cycle batteries connected in series. It provides a 230V AC supply for selected equipment when mains power is interrupted, then recharges the batteries when an acceptable AC supply returns. Solar panels can be added within the inverter’s specified PV limits.
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 27kW of power handling capability and up to 72kWh 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 equipment: 0ms line-to-battery transfer; transfer between inverter and bypass modes is 4ms.
- Pure sine wave output: 3kVA/3kW continuous rating, with twice rated power available for five seconds within the inverter’s operating limits.
- Deep-cycle AGM storage: four 6V batteries form a 24V, 335Ah 8.04kWh bank at C20, without routine electrolyte topping-up.
- Flexible charging: up to 60A from mains and a built-in 60A MPPT controller for up to 1,500W of compatible solar panels.
- Local control and monitoring: LCD settings, RS232 communication and Bluetooth, with overload, overtemperature and short-circuit protection.
Where to use
Suitable for assessed essential-load circuits serving warehouse offices, logistics administration, network switches, routers, CCTV recorders, access-control equipment and commercial workstations. Total running power, starting surges and the required backup duration must be checked before selecting the system.
This is a single-phase supply for selected loads, not a complete warehouse or factory backup system. Suitability for medical, life-safety or other specialist equipment requires a separate application assessment.
System contents and battery capacity
- 1 x ICONICA IC-ZT3000-24 3kW 24V zero transfer time inverter-charger.
- 4 x Rolls S6-370AGM 6V deep-cycle AGM batteries, connected as one series string.
- 1 x Mersen DC Fused Disconnect 2-pole NH1 fuse size 250ADC max
- Required cables, battery interlinks, fuses, AC protection and any enclosure included.
The bank stores a nominal 8.04kWh at C20. A 80% depth-of-discharge allowance corresponds to 400-500 life cycle. Actual usable energy and runtime depend on load, temperature, battery condition and configured cut-off settings.
Installation and commissioning
This system is not ready to use straight out of the box. A qualified electrician must design and install the battery connections, DC protection and isolation, AC protection, earthing and essential-load circuits. Ask Energian about installation through trusted partners.
Charging voltages, current limits and low-voltage protection must be commissioned for the Rolls batteries and their operating temperature. Do not assume the inverter’s default AGM profile is correct. Battery equalisation must remain disabled for these AGM batteries.
Zero transfer time applies to the specified line-to-battery transition, not every operating-mode change. Select and commission the operating mode for the connected equipment; bypass transfer is specified at 4ms.
Technical specifications
Inverter figures below are from the supplied IC-ZT user manual, version 1.2, using the 3kW model column. Battery figures are from the supplied S6-370AGM technical datasheet. Calculated bank figures are identified separately.
| System specification | Value |
|---|---|
| Inverter model | ICONICA IC-ZT3000-24 |
| Battery quantity and model | 4 × Rolls S6-370AGM |
| Battery-bank configuration | Four 6V batteries in series; one 24V string |
| Bank capacity at C20 | 335Ah at 24V |
| Bank capacity at C100 | 370Ah at 24V |
| Nominal bank energy at C20 — calculated | 8.04kWh: 24V × 335Ah |
| Battery-only weight — calculated | 4 x 48kg |
| Combined inverter and battery net weight — calculated | 205kg, excluding cables, accessories, enclosure and packaging |
| Inverter: AC input and line mode | |
| Input voltage waveform | Sinusoidal |
| Nominal AC input voltage | 230V AC |
| Maximum AC input voltage | 300V AC |
| Low-loss input voltage / return voltage | 110V AC ±7V / 120V AC ±7V |
| High-loss input voltage / return voltage | 280V AC ±7V / 270V AC ±7V |
| Nominal input frequency | 50Hz / 60Hz, automatic detection |
| Low-loss frequency | 46Hz (56Hz) ±1Hz |
| Low-loss return frequency | 46.5Hz (57Hz) ±1Hz |
| High-loss frequency | 54Hz (64Hz) ±1Hz |
| High-loss return frequency | 53Hz (63Hz) ±1Hz |
| Power factor | >0.98 |
| Peak line-mode efficiency | 93% |
| Transfer time: line ↔ battery | 0ms |
| Transfer time: inverter ↔ bypass | 4ms |
| Output short-circuit protection | Circuit breaker in line mode; electronic circuits in battery mode |
| Inverter: battery mode and AC output | |
| Rated output power | 3kVA / 3kW |
| Output waveform | Pure sine wave |
| Output voltage regulation | 230V AC ±5% |
| Output frequency | 50Hz or 60Hz |
| Peak battery-mode efficiency | 90% |
| Overload protection | 5 seconds at ≥150% load; 10 seconds at 105–150% load |
| Surge capacity | Twice rated power for 5 seconds |
| Nominal DC input voltage | 24V DC |
| DC operating range | 20–34V DC |
| Cold-start voltage | 23V DC |
| Low DC warning voltage | 22.5V at <50% load; 22.0V at ≥50% load |
| Low DC warning return voltage | 23.5V at <50% load; 23.0V at ≥50% load |
| Low DC cut-off voltage, specification table | 21.5V at <50% load; 21.0V at ≥50% load |
| User-defined low DC cut-off setting | 20.0–27.0V in 0.1V steps; must be commissioned for the batteries |
| High DC recovery / cut-off voltage | 32V / 34V |
| No-load power consumption | <75W |
| Inverter: mains and solar charging | |
| Mains charging current | 30A default; 60A maximum at nominal AC input voltage |
| Mains charging-current settings | 2A, 10A, 20A, 30A, 40A, 50A or 60A, subject to total charging-current limit |
| Charging algorithm | Three-stage: bulk, absorption and float |
| Preset AGM/GEL bulk voltage | 28.2V DC — inverter preset, not the commissioned Rolls setting |
| Preset flooded-battery bulk voltage | 29.2V DC — not the battery profile for this AGM package |
| Preset float voltage | 27.0V DC — inverter preset, not the commissioned Rolls setting |
| User-defined bulk and float voltage settings | 24.0–32.0V DC in 0.1V steps |
| Overcharge protection | 34V DC |
| Solar charge-controller type | MPPT |
| Rated solar input power | 1,500W |
| Maximum solar charging current | 60A |
| Maximum solar-controller efficiency | 98.0% |
| Maximum PV array open-circuit voltage | 145V DC; array design must account for cold-weather voltage rise |
| PV MPPT operating voltage range | 30–115V DC |
| Battery-voltage measurement accuracy | ±0.3% |
| PV-voltage measurement accuracy | ±2V |
| Maximum combined mains and solar charging current | 120A inverter capability; battery charging limit must be set separately |
| Combined charging-current setting | 10–120A in 10A steps; 60A default |
| Inverter: ECO/bypass mode | |
| Input voltage waveform | Sinusoidal |
| Low-loss input voltage / return voltage | 176V AC ±7V / 186V AC ±7V |
| High-loss input voltage / return voltage | 280V AC ±7V / 270V AC ±7V |
| Nominal input frequency | 50Hz / 60Hz, automatic detection |
| Low-loss frequency / return frequency | 46Hz (56Hz) ±1Hz / 46.5Hz (57Hz) ±1Hz |
| High-loss frequency / return frequency | 54Hz (64Hz) ±1Hz / 53Hz (63Hz) ±1Hz |
| Inverter: controls, installation and environment | |
| Display | LCD with status indicators and function buttons; removable display supports remote mounting with an optional communication cable |
| Communication | RS232 and Bluetooth; USB functions include firmware update, parameter transfer and data-log export |
| Bluetooth monitoring | WatchPower; manual states approximately 6–7m range in open space |
| Dry contact | 3A / 250V AC, for external signalling |
| Parallel capability | Supported on parallel-capable models; expansion requires compatible units and additional installation components |
| Operating temperature | 0°C to 55°C |
| Storage temperature | −15°C to 60°C |
| Relative humidity | 5–95%, non-condensing |
| Dimensions, D × W × H | 140 × 303 × 525mm |
| Net inverter weight | 13kg |
| Marking stated in manual | CE; no specific UPS classification or test standard is stated in the supplied specification table |
| Installation | Qualified personnel; vertical mounting on a suitable non-combustible surface; external protection and isolation to be specified by the installer |
| Rolls S6-370AGM: specifications per battery | |
| Battery technology | Deep-cycle AGM lead-acid |
| Nominal voltage | 6V |
| Capacity at 100-hour rate, 25°C | 370Ah |
| Capacity at 20-hour rate, 25°C | 335Ah |
| Capacity at 10-hour rate, 25°C | 300Ah |
| Internal resistance | 1.6mΩ, fully charged at 25°C |
| Maximum short-duration discharge | 2,000A for 5 seconds at 25°C; not a continuous operating rating |
| Standard terminal | DT; drawing shows M8 connection |
| Battery dimensions, L × W × H | 295 × 178 × 366mm |
| Weight per battery | 48kg |
| Cycle charging voltage, per battery at 25°C | 7.25–7.45V DC |
| Float charging voltage, per battery at 25°C | 6.8–6.9V DC |
| Corresponding four-battery cycle voltage — calculated | 29.0–29.8V DC at 25°C; final setting to follow Rolls commissioning guidance |
| Corresponding four-battery float voltage — calculated | 27.2–27.6V DC at 25°C; final setting to follow Rolls commissioning guidance |
| Capacity at 40°C / 25°C / 0°C / −15°C | 102% / 100% / 85% / 65%, based on the 20-hour rate |
| Capacity remaining after storage at 25°C | 91% after 3 months; 82% after 6 months; 64% after 12 months |
| Reserve capacity at 25A | 751 minutes |
| Reserve capacity at 75A | 184 minutes |
| Battery ventilation | At least passive ventilation; do not install in a completely sealed enclosure |
| Recommended spacing between batteries | 25–75mm, according to the Rolls user manual |
| Equalisation | Disabled for AGM batteries |
| Battery constant-current discharge data | |
| Test endpoint | 1.75V per cell: 5.25V per battery, or 21.0V across four batteries in series; not a recommended routine discharge target |
| 30-minute discharge current | 301.5A |
| 45-minute discharge current | 222.6A |
| 1-hour discharge current | 184.3A |
| 2-hour discharge current | 102.4A |
| 3-hour discharge current | 75.9A |
| 5-hour discharge current | 53.2A |
| 8-hour discharge current | 36.4A |
| 10-hour discharge current | 30.0A |
| 20-hour discharge current | 16.8A |
| Interpretation | Battery test data, not guaranteed system runtimes. The same current flows through every battery in the series string. A constant-power inverter draws increasing current as battery voltage falls. |
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UK expert support
Contact Energian for help checking load requirements, battery capacity, solar compatibility and installation options. Speak to our UK team by phone, email or live chat, or arrange an in-person consultation at our office.
Documents available for download
Document revisions may change. Confirm that the manual supplied with your inverter and the battery labels match the equipment being installed.