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A reef tank is the most outage-sensitive pet setup there is — corals and fish can crash within hours without flow, heat, and oxygen. A power station with UPS mode is essential insurance for apartment reefers.
The short answer
A reef tank’s life support (return pump, powerheads, heater, skimmer) draws 150–400 W, so a 1 kWh+ unit with UPS pass-through keeps it alive 3–7 hours and switches over instantly. In a long outage, prioritise a powerhead (flow + oxygen) and the heater. Our pick: the Bluetti AC180.
Reef life-support power & runtime
| Setup | Draw | On 1152Wh |
|---|---|---|
| Powerhead + heater (priority) | ~150 W | ~6.5 hrs |
| Full system (pump, skimmer, lights off) | ~250 W | ~4 hrs |
| + reef lights | ~400 W | ~2.6 hrs |
Drop the lights first in an outage — corals tolerate dark far better than lost flow or heat. A single powerhead keeps water oxygenated and moving, which buys the most time per watt.
Best power stations for a reef tank
Bluetti AC180
Sub-20 ms UPS and a 2700 W surge for pump startup — life support never skips a beat.
EcoFlow DELTA 2
Expandable to 3 kWh — the way to keep a reef alive through a multi-hour or overnight outage.
Frequently asked questions
How long can a power station keep a reef tank alive?
~3–7 hours on a 1 kWh unit running pump and heater; longer if you cut the lights and run only a powerhead and heater.
What should I prioritise?
Flow and oxygen (a powerhead) first, then heat. Reef lights can go off — corals handle dark better than stagnant, cold water.
Does it switch over automatically?
Yes with UPS pass-through (AC180) — critical, since a reef can crash fast if flow stops even briefly.
Related guides
- Best Power Station for a Fish Tank
- Best Power Station for a Reptile Tank
- Best Power Station for a Medication Fridge
- Best Portable Power Station for Apartment Blackout
Insurance for your reef
For a reef tank, UPS pass-through is non-negotiable. The Bluetti AC180 keeps life support running with an instant switchover; the DELTA 2 expands for long outages.