Battery-ready does not always mean backup-ready
Some hybrid inverters can charge and discharge a battery while the grid is present but need additional transfer equipment, a backup interface or a separate backed-up-loads board to operate safely when the grid fails. Confirm the supported topology in documentation for the exact regional model.
Define essential loads and starting loads
Lights, communications and refrigeration behave differently from pumps, air conditioners and other motors. Compare the proposed backed-up circuits with continuous inverter output and short-duration surge capability. Ask what happens if demand exceeds the backup rating.
Check phase and neutral behavior
Single-phase and three-phase systems can have different backup limitations. A three-phase home may not receive identical backup on every phase, and some systems impose per-phase limits. Neutral switching and local wiring rules are design matters for a qualified installer, not assumptions to make from a marketing page.
Confirm solar operation during a grid outage
Some systems can continue using PV to support loads and recharge a battery during an outage; others have restrictions tied to battery state, grid-forming capability or approved hardware. Ask how the system behaves at sunrise after a long outage and what minimum battery reserve is required.
Commission the actual failure mode
At handover, a controlled backup test should demonstrate transfer, protected circuits, monitoring, recovery when grid power returns and any owner actions. Keep the final settings and equipment list with the project records.
Related Melnti checks
essential vs whole-home backup commissioning checklist compatibility guide
Check the exact regional version
The same product family name may cover different grid voltages, phase arrangements or approved backup accessories. Preserve the model code used in the final design and commissioning record.