UPS for Starlink: Keep the Dish Online in a Power Cut

When the power goes out, a UPS (uninterruptible power supply) is the difference between your Starlink staying online and a hard reboot. But a UPS only does one thing: it keeps power flowing to whatever you plug into it. It is worth being precise about what that does and does not solve before you spend anything.

What a UPS actually protects (local power, not the link)

A UPS backs up the electricity to your own hardware — the Starlink power supply, dish, and router. That covers the most common cause of a home Starlink outage: your grid power went out, not Starlink. In that case a UPS keeps the dish powered and the link stays up.

It does not help when the problem is upstream of your house: a Starlink network or satellite issue, a scheduled maintenance window, congestion, or a physical obstruction of the sky view. No amount of battery at your end restores a link that is down on the other side. If you are not sure which it is, rule out the sky and the service first — our obstruction checker and a quick speed test once power returns help separate a local power cut from a real link problem.

UPS vs power station vs off-grid solar

Match the tool to how long you need to stay online:

• Office/standby UPS — instant, automatic switchover and surge protection for short cuts (minutes to about an hour). Best when zero-drop switchover matters, like calls.
• Portable power station (LiFePO4) — far more stored energy for longer outages, RVs, and travel, with a pure sine wave AC output. Transfer is not always instant unless it has a UPS/EPS mode.
• Off-grid solar + battery — for running Starlink where there is no grid at all. That is a different design; see our off-grid solar and battery guide and the power sizer.

What to check before you buy

• Pure sine wave output. The Starlink PSU is a switch-mode supply; pure sine wave is the clean, low-risk choice. Prefer it over simulated/stepped sine.
• Watt headroom.The unit's continuous watt rating must comfortably exceed your kit's real draw, including startup and any snow-melt behaviour. Start from Starlink's official specifications for your model and measure the installed system.
• Real capacity, in watt-hours.VA ratings are not watt-hours. Runtime depends on the battery's usable watt-hours, so compare Wh (or Ah × voltage), not just the VA headline.
• Switchover and outlets. Confirm automatic transfer (and how fast), enough outlets for the PSU and router, and — for power stations — whether a UPS/EPS pass-through mode exists.

Estimate the runtime honestly

Runtime is arithmetic, not a marketing number. A transparent estimate is:

Illustrative example (an estimate, not a tested runtime): a power station with about 500 usable Wh at ~85% inverter efficiency, powering a system drawing ~75 W, gives 500 × 0.85 ÷ 75 ≈ 5.7 hours. Halve the watt-hours and you roughly halve the runtime; a small office UPS with tens of watt-hours bridges only minutes to an hour. These figures are illustrative inputs — measure your own kit and read the unit's real battery Wh.

Real gear to compare — after you size it

Pick capacity from the runtime you calculated, not from a headline. These are real, widely-sold categories to compare against their own datasheets and current listings:

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• A pure sine wave UPS(for example CyberPower's PFC sine-wave line) for instant switchover on short cuts — check its watt rating and battery watt-hours.
• A LiFePO4 portable power station (brands like EcoFlow or Jackery) with a pure sine wave output and a UPS/EPS mode for longer outages, RVs, or travel.
• A 12V DC battery backup if your kit supports a documented DC power path — it skips inverter loss, but only use a path confirmed compatible with the exact kit.

Whatever you choose, the sizing above is the point: match the watt rating to your kit's real draw and the watt-hours to the runtime you need, then verify the current specification and price on the listing before buying.