EASYWAY UNIV-HV ST54K 53.76 kWh high-voltage LiFePO4 battery

The EASYWAY UNIV-HV ST54K is the middle of the three ST models: 53.76 kWh total (50.53 kWh usable) capacity, 7 modules of 7.68 kWh and one control unit (BMS), with a nominal voltage of 537.6 V DC. A seven-module tower replaces several smaller systems with a single enclosure, so it is meant for production and larger commercial sites. At a 10 kW load the usable capacity lasts about 5 hours; after the warranty ends, a module or the control unit is replaced, not the whole tower.

Technical specifications

How the ST54K differs from the ST46K and ST61K

Choose the ST54K when the ST46K is too small for a production or commercial site but you do not need eight modules. If a smaller tower is enough, the EASYWAY UNIV-HV ST46K fits; if you need more, look at the EASYWAY UNIV-HV ST61K: it has 57.75 kWh usable, and at a 10 kW load it lasts about 6 hours instead of 5.

What is a 54 kWh high-voltage battery good for in production?

The ST54K is aimed at production and larger commercial sites. A seven-module tower is a single enclosure instead of several smaller systems.

Which inverters work with a high-voltage battery?

The ST54K connects to a hybrid inverter whose voltage range matches the battery, because high-voltage and low-voltage systems are not compatible with each other. The manufacturer’s compatibility list includes Solis, Deye, Pylontech, Growatt, GoodWe, Sofar, Victron, Solinteg and others, confirmed for the whole product line. If your inverter is another brand, we check compatibility before you order. The link to the inverter is CAN / RS485.

How long does a 53.76 kWh battery last?

At a 10 kW load the 50.53 kWh of usable capacity lasts about 5 hours, and at 5 kW about 10 hours. At a typical evening load of around 1 kW, the 53.76 kWh lasts about 54 hours; switching on an electric hob or a washing machine shortens that accordingly.

Home battery for solar panels: why store the surplus?

A solar PV system produces while you consume, and the battery moves the remainder into the evening and night. ESO (Lithuanian grid operator) states:

“Part of the surplus electricity generated can be stored in an energy storage device and used in the evening.”

ESO — Energy storage devices

Backup power, installation and what to know before buying

• Backup power: the system works during a power cut if the inverter has a backup output and an automatic changeover; the inverter performs the switching.
• Where to install: the enclosure is rated IP65, but the manufacturer specifies indoor installation (5–95 % relative humidity, non-condensing). Cooling is natural.
• Space: you need a dry room with a temperature above zero and clear space around the enclosure.

We handle it for you. We select the equipment for your site, deliver anywhere in Lithuania, install and connect it. The consultation before purchase is free.

Frequently asked questions

How many kWh does the EASYWAY UNIV-HV ST54K have?

The EASYWAY UNIV-HV ST54K has 53.76 kWh of total and 50.53 kWh of usable capacity. One tower consists of 7 modules of 7.68 kWh and one control unit.

How long will the ST54K last in a power cut?

At a 10 kW load the EASYWAY UNIV-HV ST54K lasts about 5 hours, at 5 kW about 10 hours, and at an evening load of around 1 kW about 54 hours.

Which inverters is the ST54K compatible with?

The manufacturer’s list includes Solis, Deye, Pylontech, Growatt, GoodWe, Sofar, Victron, Solinteg and others, confirmed for the whole EASYWAY UNIV-HV line. Hybrid Energy checks inverters of other brands before you order.

Can the ST54K be used with a low-voltage inverter?

No. The ST54K is a high-voltage battery (nominal voltage 537.6 V DC), and high-voltage and low-voltage systems are not compatible with each other. It needs a hybrid inverter with a matching voltage range (470.4–604.8 V DC).

Does the ST54K work during a power cut?

Yes, if the inverter has a backup output and an automatic changeover. The battery stores the energy and the inverter does the switching.

How many cycles and how many years of warranty does the ST54K have?

The manufacturer states 6000 cycles to 80 % remaining capacity and a 10-year warranty for the ST54K. The warranty is valid when the battery is connected to the internet.

Can the ST54K be installed in an unheated garage?

It is not recommended: the manufacturer specifies indoor installation, and without heating charging is possible only from 0 °C. An unheated garage needs the version with built-in heating.

Is the ST54K safe?

The ST54K has a built-in aerosol fire suppression system and protection against overvoltage, overcurrent, short circuit and overheating. Its certificates are CE, IEC 62619, UN38.3 and UL 1973 for the cells.

What happens when the ST54K warranty ends?

The system is modular, so after the warranty a specific module or the control unit is replaced, not the whole tower.

Who installs and connects the ST54K?

Hybrid Energy sizes the capacity to your evening consumption, delivers anywhere in Lithuania, installs the ST54K and connects it to the inverter.

Sources

• ESO — Elektros energijos kaupikliai (quote on storing surplus electricity), checked 2026-10-26