EASYWAY UNIV-HV ST31K 30.72 kWh High-Voltage Home Battery
€5,999.00
EASYWAY UNIV-HV ST31K is a 30.72 kWh high-voltage LiFePO4 home battery with 28.88 kWh usable capacity, rated for 6000 cycles and IP65.
- Free delivery across Lithuania
- 14-day returns — we pay for the return shipping
- Manufacturer warranty, CE compliant
The EASYWAY UNIV-HV ST31K is a modular high-voltage LiFePO4 home battery with 30.72 kWh total and 28.88 kWh usable capacity, at a nominal 307.2 V DC. It is built from 4 × 7.68 kWh modules plus a BMS, has an IP65 rating, and the manufacturer declares 6000 cycles to 80 % remaining capacity. It is intended for a large house, a farmstead or a small workshop.
Technical specifications
| Parameter | Value |
|---|---|
| Model | ST31K |
| Manufacturer code | VBS91284 |
| Battery type | LiFePO4 (LFP) |
| Total capacity | 30.72 kWh |
| Usable capacity | 28.88 kWh |
| Modules | 4 × 7.68 kWh + BMS |
| Nominal voltage | 307.2 V DC |
| Voltage range | 268.8–345.6 V DC |
| Recommended charge / discharge current | 50 A / 50 A |
| Recommended depth of discharge (DoD) | 90 % |
| Dimensions (W × H × D) | 660 × 840 × 450 mm |
| Weight | 280 kg |
| Cycle life | 6000 cycles to 80 % remaining capacity |
| Communication | CAN / RS485 |
| Control | app + Wi-Fi |
| Ingress protection | IP65 |
| Mounting | floor-standing, modular |
| Cooling | natural convection |
| Fire safety | built-in aerosol fire suppression |
| Protections | overvoltage, overcurrent, short circuit and overheating |
| Certifications | CE, IEC 62619, UN38.3, cells UL 1973 |
| Warranty | 10 years (when connected to the internet) |
| Installation location | indoors: 5–95 % relative humidity, non-condensing |
| Charging without built-in heating | only from 0 °C |
Home battery storage for large houses and farmsteads: who is a 30.72 kWh battery for?
- A large house
- A farmstead
- A small workshop
High-voltage battery: which inverters is it compatible with?
The EASYWAY UNIV-HV ST31K is a high-voltage battery, so it connects to a high-voltage hybrid inverter. The manufacturer’s compatibility list names Solis, Deye, Pylontech, Growatt, GoodWe, Sofar, Victron, Solinteg and others, and compatibility is confirmed for the whole product line.
High-voltage and low-voltage systems are not compatible with each other, and each manufacturer has its own list of approved pairings. If your inverter is another brand, we check before you order.
How many hours does a 30.72 kWh battery last with solar panels?
At a 3 kW load, the 28.88 kWh of usable capacity lasts about 10 hours; at 2 kW, about 14 hours. Powerful appliances shorten that, so work it out from your real load.
Capacity can be increased by adding modules in one tower or by running several towers in parallel, matched to the inverter and the site.
How do you connect a battery to a solar system?
The battery connects to a hybrid inverter and stores surplus solar energy so you can use it in the evening. ESO (Lithuanian grid operator) states:
“Part of the surplus electricity generated can be stored in an energy storage device and used in the evening.”
We handle it for you. We select the equipment for your site, deliver anywhere in Lithuania, install and connect it.
What to know before you buy
- Size and weight: 660 × 840 × 450 mm, 280 kg; the battery stands on the floor.
- Where to place it: the enclosure is rated IP65, but the manufacturer specifies indoor installation (5–95 % relative humidity, no condensation).
- Winter: without built-in heating, charging is possible only from 0 °C.
- Warranty: the 10-year warranty applies when the battery is connected to the internet.
- Floor space: going by its dimensions, the battery takes up about 0.66 × 0.45 m of floor.
- Safety and protection: built-in aerosol fire suppression, plus protection against overvoltage, overcurrent, short circuit and overheating.
Frequently asked questions
How long does 30.72 kWh last?
At a 3 kW load, the 28.88 kWh of usable capacity lasts about 10 hours; at 2 kW, about 14 hours. Powerful appliances shorten that.
Is the ST31K right for my home or site?
The ST31K is intended for a large house, a farmstead or a small workshop: at a 3 kW load, 28.88 kWh lasts about 10 hours. Hybrid Energy helps you work out whether this capacity will cover your site.
Which inverters is the EASYWAY UNIV-HV ST31K compatible with?
The manufacturer’s compatibility list names Solis, Deye, Pylontech, Growatt, GoodWe, Sofar, Victron, Solinteg and others. Hybrid Energy checks compatibility with your inverter before you order.
Is the ST31K a high-voltage battery?
Yes. The EASYWAY UNIV-HV ST31K has a nominal voltage of 307.2 V DC and a voltage range of 268.8–345.6 V DC. High-voltage and low-voltage systems are not compatible with each other.
What is the usable capacity of the ST31K?
Total capacity is 30.72 kWh and usable capacity is 28.88 kWh, with a recommended depth of discharge of 90 %.
How many cycles and what warranty?
The manufacturer declares 6000 cycles to 80 % remaining capacity and a 10-year warranty, which applies when the battery is connected to the internet.
Can the ST31K be installed outdoors?
The enclosure is rated IP65, but the manufacturer specifies installation indoors, where relative humidity is 5–95 % and there is no condensation.
Can the battery be charged in winter?
Without built-in heating, charging is possible only from 0 °C. We choose the location with this in mind.
Can the ST31K be expanded?
The EASYWAY UNIV-HV ST31K is a modular system of 4 × 7.68 kWh + BMS. Capacity can be increased by adding modules in one tower or by running several towers in parallel, matched to the inverter and the site.
How much does the ST31K weigh and how big is it?
The EASYWAY UNIV-HV ST31K weighs 280 kg and measures 660 × 840 × 450 mm. It is floor-standing.
Sources
- ESO — Energy storage systems, checked 2026-10-26
| Weight | 280 kg |
|---|---|
| Dimensions | 66 × 84 × 45 cm |
| Brand | EASYWAY |
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