Best Portable Power Station for Well Pump (2026)

Why 13 of the 15 models are out

A well pump pushes water from the well up to the house. Most submersible pumps, the kind that sit under the water at the bottom of the well, run on 240 volts. Voltage is the push behind electricity, much like pressure in a water pipe. A normal wall outlet gives 120V. Large appliances such as a clothes dryer use 240V.

Only two of the 15 models here list 120/240V output: the EcoFlow Delta Pro 3 and the Anker Solix F3800. The other 13 list 120V only. However much energy they store, they cannot turn a 240V pump.

The 3,000W start

Our table uses a 1/2 horsepower pump that pulls about 1,000W while it runs. For the instant it starts, it needs about 3,000W. That burst is called startup surge. It is like a cyclist pulling away from a stop: the first few pedal strokes are the hardest.

Every power station has a surge rating, the most it can supply for a moment. The Delta Pro 3 lists 8,000W and the F3800 lists 9,000W, so both clear the start with room to spare. A larger pump draws more and starts harder.

Count days of water, not hours

A well pump does not run all day. It fills a pressure tank and stops. A pressure tank holds water under pressure, so the taps work for a short while with no pump running. When the pressure drops, the pump starts again.

Our numbers assume the pump runs about 2 hours a day in total. That is about 1,900 watt-hours a day at the pump. A watt-hour is a unit of energy: one watt used for one hour. On that basis the Delta Pro 3 lasts 1.8 days and the F3800 lasts 1.7.

Your household sets the real figure. Every flush, shower and load of laundry makes the pump run. If you halve your water use during an outage, the pump runs about 1 hour a day and the two figures roughly double, to about 3.6 and 3.4 days. Watering a garden does the opposite.

When the power first fails, the pressure tank still holds some water. Save it for drinking.

Check the nameplate before you buy

Our figures are typical, not your pump’s. The nameplate lists volts, amps and horsepower. A submersible pump is down the well where you cannot read it, so look at the control box near the pressure tank if your system has one, or at the installer’s paperwork. A well contractor can also tell you.

Some shallow-well pumps run on 120V. For those the sizing is different. The 240V rule no longer applies, and the watts and startup surge of that pump decide which models qualify. Do not use this page’s picks or runtimes for a 120V pump.

For a 240V pump, multiply amps by volts to get running watts. If yours pulls 1,500W and not 1,000W, the 1.8 days becomes about 1.2.

The hookup is an electrician’s job

A well pump is hardwired. That means it is wired straight into the house’s electrical system and has no plug. To run it from a power station you need a transfer switch. That is a switch that moves the pump’s circuit from grid power to backup power, so the two can never be connected at once. A licensed electrician has to install it.

Get the quote before you buy, and name the power station you plan to use. Never try to feed the house through a wall outlet with a homemade cord. It can kill.

Stretching the water

Both picks can grow. EcoFlow sells add-on batteries for the Delta Pro 3 and Anker sells expansion batteries for the F3800.

Both also take solar panels: up to 2,600W on the Delta Pro 3 and up to 2,400W on the F3800. A day of pumping takes about 2,260 watt-hours out of the battery after losses. So one hour of sun at full input would put back roughly a day of water. Panels rarely reach their full rating, so allow longer.

The cheapest step costs nothing. If a storm is forecast, fill jugs and a bathtub while the grid is still up.