An ATS transfers between sources according to defined logic. The device alone cannot guarantee correct earthing, protection or uninterrupted supply.
System architecture
Define sources, critical circuits and permitted states. Grid, generator and inverter need coordinated interaction and prevention of unintended backfeed.
Transfer conditions
Define grid-failure criteria, delays, backup readiness and return conditions. Loads tolerate different interruptions; sensitive equipment may need a different arrangement.
Protection in both modes
Electrical design must verify shock, short-circuit and overload protection for each source. This article specifies no neutral arrangement, cabling or device ratings.
Failures and manual control
Consider communication loss, failed starting and an unavailable battery. Manual operation and instructions should be clear and prevent incompatible simultaneous states.
Acceptance and mistakes
Test agreed transfers with critical loads, not only no-load starting. Record settings, results and maintenance procedures; automation without scenario tests remains unverified.
| Item | Parameter | Check / result |
|---|---|---|
| Failure | Grid unavailable | Safe transfer |
| Backup | Source readiness | Circuit supply |
| Return | Stable grid | Agreed delay |
What this means for your project
Request a state and test table with the electrical design. Do not substitute a generic online wiring diagram.
Sources and scope of review
Related reading
- How to Choose an Inverter for Backup Power
- Generator or Battery: Which Is Better for a Home?
- Backup for Well Pumps, MVHR and Refrigeration