Battery storageUNIV FlexiStack Battery Storage
Brand: Easyway Energy · Involtis is the general importer of Easyway Energy for Austria.
- Stackable LiFePO₄ storage: ST30k (4 modules) or ST60k (8 modules) on one base
- 30.72 kWh or 61.44 kWh total energy (28.88 / 57.75 kWh usable)
- 51.2 V nominal voltage, 600 Ah or 1,200 Ah
- Communication via CAN / RS485, integrated BMS
- > 8,000 cycles at 25 °C and 80 % DOD, 10-year warranty
Prices and dealer terms on request.
UNIV FlexiStack battery storage for PV systems
UNIV FlexiStack battery storage systems are the ideal solution for your PV system. The storage can be matched precisely to actual energy consumption as required. Whether for industry, commerce, agriculture or the home, the UNIV FlexiStack series offers the right solution for everyone with 30.72 or 61.44 kWh total energy. If you want to use your solar power efficiently in the long term, the UNIV FlexiStack series is a future-proof energy storage system for PV systems.
The individual battery modules are simply stacked on top of each other – no wall mounting or complex cabling required. This makes the storage system particularly suitable for plant rooms, storage areas or commercial energy centres. And if demand grows, the system can easily be expanded.
Benefits at a glance
- 30.72 or 61.44 kWh total energy (4 or 8 modules)
- Stackable design – simple floor installation
- More than 8,000 charge cycles at 25 °C and 80 % DOD
- Maintenance-free operation thanks to passive cooling
- Integrated battery management system (BMS)
- Communication interfaces: CAN / RS485
- Protection rating IP20 – for indoor use
- 10-year warranty on the complete system
Applications
- Commercial businesses with high power consumption
- Farms with their own power supply
- Plant rooms in modular buildings
- Retrofittable storage solutions for existing PV systems
- Energy systems aiming for self-sufficiency
UNIV FLEXISTACK variants
The UNIV FlexiStack ST30k with 30.72 kWh total energy is suitable for small to medium-sized PV systems. The larger ST60k with 61.44 kWh is ideal for industrial and commercial use.
Involtis – your partner in Austria
As General importer of Easyway Energy for Austria, Involtis supports you in selecting, planning and integrating the right storage system. You receive not only a high-quality product but also personal advice and service – right on site.
| Models | UNIV-LV ST30k · UNIV-LV ST60k |
|---|---|
| Components | 4 modules + 1 base · 8 modules + 1 base |
| Total energy | 30.72 kWh · 61.44 kWh |
| Usable energy | 28.88 kWh · 57.75 kWh |
| Nominal voltage | 51.2 V |
| Voltage range | 44.8 – 57.6 V |
| Nominal capacity | 600 Ah · 1,200 Ah |
| Recommended charge/discharge current | 300 A · 600 A |
| Recommended depth of discharge (DOD) | 90 % |
| Scalability | Up to 20 modules in parallel |
| Dimensions (W × H × D) | 660 × 740 × 440 mm · 660 × 1,360 × 440 mm |
| Weight | 268 kg · 516 kg |
| BMS functions | Overvoltage and overcurrent protection, short-circuit protection, undervoltage protection, overtemperature protection, cell balancing |
| Communication | CAN / RS485 |
| Operating temperature | Charging 0 – 55 °C · discharging −20 – 60 °C |
| Storage temperature | 15 – 35 °C |
| Protection class | IP20 |
| Installation type | Stackable |
| Cooling | Natural cooling (passive) |
| Operating environment | Indoor (5 – 95 % relative humidity, non-condensing) |
| Installation altitude | < 4,000 m |
| Warranty | 10 years |
| Service life | 15+ years (at 25 °C) |
| Cycle life | > 8,000 cycles @ 25 °C, 80 % DOD |
| Certification | CE · cell: UL 1973 |
| Transport certification | UN38.3 / MSDS |
Downloads
Certifications & safety
According to Involtis, the certificates and test reports of the UNIV series also apply to this model. The individual documents (CB certificate, SGS test reports) are issued for the UNIV-16kWh models – originals can be viewed on request. Sources: Easyway datasheets (Involtis data folder) and Involtis company presentation 2026.
- CECE marking (datasheet)
- UL 1973 (cell)Cell certification to UL 1973 (datasheet: “Cell UL 1973”)
- UN38.3Transport test for lithium batteries (datasheet)
- MSDSSafety data sheet for transport (datasheet)
- IEC 62619:2022Safety standard for stationary lithium battery systems – CB test certificate no. BE-57990 (SGS Belgium NV / CEBEC, 18 June 2026) and SGS test report no. SHES260400554801 (issued for UNIV-16kWh, variants I, II, WP)
- EMV 2014/30/EUEN IEC 61000-6-1:2019 / 61000-6-3:2021, EN 61000-3-2/-3 – SGS certificates of conformity no. SHCR260400078201AEC and LAB-QJRZ250212EMCA01
- Low voltage 2014/35/EUEN IEC 60335-1:2023 – LAB-QJRZ250212LVDA01
- RoHS 2011/65/EURestriction of hazardous substances, tested to IEC 62321 – LAB-QJRZ250212ROHSA01
- ISO 9001:2015Quality management of the manufacturer Eway Energy Technology (Danjiangkou) Co., Ltd. – certificate no. ZBF25Q1595R0S, valid until 26 June 2028
Note on indoor installation (according to Involtis): the battery storage systems meet the requirements of OIB Guideline 2 (fire protection, 2023 edition) – the passed safety test and proven thermal runaway protection are documented. This allows installation of up to 100 kWh total capacity in residential areas without a separate fire-protected room. Please coordinate the specific implementation with the locally responsible authorities – we will be happy to support you.
Questions about this product?
We advise you on sizing, compatibility and availability – personally and with hands-on experience.