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What happens if my solar or battery loses Wi-Fi?

Short answer

Panels keep generating and batteries keep running their last settings, but the app stops updating, tariff-driven schedules and firmware updates may stop, and some warranties need regular connection. Tesla, for example, may only honour four years of its ten-year warranty if a Powerwall stays offline. Fix router changes and weak signal promptly.

Last checked 24 September 2026 · 1 source

In more detail

  • Common causes: router replaced or password changed, weak signal at the inverter location, dongle failure, server outage.
  • Check the inverter's own display for live generation before assuming a fault.
  • Smart tariffs that control batteries (e.g. supplier-controlled modes) stop working offline.
  • Wired Ethernet or a Wi-Fi extender at the inverter location is more reliable.

The facts, dated

  1. 01
    Tesla honours at least 4 years if Powerwall is not internet-connected; full 10 years needs connection — 4/10 years

    manufacturer · UK · checked 24 September 2026 · Infinity Energy

Sources

Last checked: 24 September 2026