3-phase power supplies are a little tricky.
To keep it simple single-phase battery systems can work with 3-phase power while still proving energy savings across all 3-phases thanks to net metering here in Western Australia. However, if requiring back-up power supply features in the event of a blackout, only 1-phase can be supported – Powerwall does this brilliantly.
If requiring all three-phases to be supported in the event of a blackout, the best battery options are potentially DC-Coupled batteries as their output is governed by the connected inverter.
An excellent inverter option which facilitates 3-phase back-up power is the Goodwe ET range. Perhaps what distinguishes this particular inverter even more than alternative three-phase hybrid inverter offerings is the ability to supply the back-up loads as an uninterrupted power supply (UPS) – the pinnacle of back-up functionality.
The Soluna 15k and the BYD HVM DC-Coupled solar batteries are two battery options within the PSW range which couple perfectly with the Goodwe ET 3-phase hybrid solar and battery inverter.
The Huawei LUNA battery, compatable with the Huawei M1 three-phase hybrid inverter is another great three phase option at minimal expense. However, back-up features are limited, requiring an additional back-up box as opposed to an all-in-one solution (specifications yet to be released).