HEIWIT battery-compatible inverters: how to choose the right configuration

Q: Can I use any inverter?

No. At present, the Heiwit battery works only with Heiwit hybrid inverters: the single-phase Virgo and the three-phase Lybra. It is not compatible with inverters from other brands, which do not support the voltage range of sodium batteries.

Dec 19, 2025 | Sodium ion batteries, Guides, Footer Guides

The battery is only half of the system: the other half is the’inverter. Good compatibility between battery and inverter is essential to achieve proper charge/discharge management, protection, performance and reliability over time.

If you want a general overview of the technology first, you can find the complete guide here:

Sodium ion batteries: what they are, advantages and comparison with lithium

Because compatibility really matters

Power ManagementThe inverter decides how much power to request from the battery at any given time.
Protectionsvoltage/current and temperature management limits must be observed.
Communication: the correct protocols allow accurate reading of SoC and safety states.
ReliabilityIncorrect compatibility can cause abnormal behaviour and battery stress.

What information is needed to verify compatibility

For a quick check you need this data:

Single-phase or three-phase
Inverter power (kW)
Plant diagram (grid-tie, hybrid, backup, etc.).
Battery voltage range and supported communication parameters
Current limits and charge/discharge power

Typical configurations

1) New plant with hybrid inverter

It is the most straightforward solution: hybrid inverter + battery designed to work together. It allows optimal management and simpler configuration.

2) Existing system (retrofit)

On an existing system there are two options:

the retrofit: keep the existing solar PV inverter and pair it with a Heiwit hybrid inverter (single-phase Virgo or three-phase Lybra) and the battery, connected on the AC line, or
replace it with a Heiwit hybrid inverter for the best integration and complete management.

To find out which way is best in your case, read the practical guide:

Retrofit on an existing system: when it pays to kit and when to replace the inverter

Quick checklist before installation

Single-phase/three-phase verification and available meter power
Check that the battery parameters required by the inverter are consistent
Set charge/discharge limits correctly
Confirm that the BMS communicates correctly (SoC and states)
Tests behaviour under real conditions (domestic loads and peaks)

Frequently asked questions

Can I use any inverter?

No. At present the Heiwit battery works only with Heiwit hybrid inverters: Virgo single-phase and Lybra three-phase. It is not compatible with inverters from other brands, which do not support the voltage range of sodium batteries.

What is the difference between single-phase and three-phase?

Load and power management changes. In three-phase, it is important to design the configuration correctly in order to achieve stable and consistent operation.