Home battery reported drained by EV charger during a grid outage
EIR-1315Provisional entry. A homeowner account, via one secondary report, says two home batteries were emptied by an EV charger during an outage; the place, the date and any independent confirmation are not known. Next update: 26 September 2026.
According to a homeowner account carried by one secondary report, a home with solar and two Tesla Powerwall 3 units switched to battery backup after a transformer on a nearby road was struck. The account said an electric vehicle kept charging through a Wallbox charger and emptied both units in about an hour. It also said Wi-Fi failed during the outage, so an automation meant to stop charging may not have worked. The place, the date and any independent confirmation were not reported.
As described in that account, a high-draw charger stayed connected after the home moved to backup, and loss of Wi-Fi may have left a cloud automation unable to stop the charge. The reported cause of the transformer strike has not been independently confirmed.
- High-draw loads such as EV chargers should be kept off battery-backed circuits or disconnected automatically when the grid fails.
- Outage plans that depend on internet-connected automation can fail if network equipment or a cloud link drops.
- A local interlock or hardwired control is more dependable than cloud automation alone.
Published 2026-09-25. Written from public reporting. Descriptive, not investigative. See the data accuracy disclaimer.