Sump Pump Generator: How Many Watts to Keep It Running

What watts mean for a sump pump

A sump pump is a motor-driven appliance. Motors draw extra power for a moment when they start, then settle to a lower steady draw. Electricity is measured in watts, and the two moments appear as two figures on a generator listing: starting watts and running watts. The generator running versus starting watts article reads the difference in full.

Starting watts is often the first number in a generator title, with running watts second. For a pump motor, the starting figure is the one that decides whether the motor can kick on; the running figure is what the motor draws afterward. Both figures come from the listing, not from this site.

Power stations state the same idea with different words: a peak AC output for the starting moment and a continuous AC output for the steady load. The power station peak versus continuous watts article reads those terms.

Where a sump pump's figures come from

The only useful source of your pump's numbers is the pump itself. The nameplate or label on the unit, and the owner's manual, usually state the voltage, amperage, and wattage or horsepower. Read those stated figures rather than a rule of thumb, because the label is the maker's own statement.

This site does not publish wattage tables that size a home or a pump, and it does not promise that any stated wattage runs any specific pump. For the pump's demand, read the label and the maker's page; for the circuit that feeds the pump, a licensed electrician and the local permit office decide what is needed.

If you want a general method for reading watts and watt-hours as listing terms, the generator wattage calculator article explains the terms. It does not replace the label on your pump.

Generator figures that matter for a pump

On a generator listing, look for two stated figures: starting watts, sometimes called surge or peak, and running watts, sometimes called continuous. The seller states both in the title or the bullet list. This site compares generators on those stated details.

An open-frame generator and an inverter generator both state starting and running watts. The difference is in the machine, not in the meaning of the two figures; the inverter versus standard generator article reads the listing terms.

Sump pump sizing appears here as a reading question, not a promise. The sump pump sizing article explains how to compare the pump's label figures with a listing's stated watts.

• Starting watts: the surge figure a motor needs to kick on
• Running watts: the steady figure the motor draws afterward
• Watt-hours: the capacity figure on a power station, a different unit from watts

A power station for a sump pump

A portable power station states its capacity in watt-hours and its AC output in watts. The AC output has a peak value and a continuous value, which works the same way as a generator's starting and running watts. Whether a station can start your pump depends on the pump's stated starting draw and the station's stated peak output.

The watt-hour capacity is the figure for how long a station can keep a load running, but this site does not publish runtime estimates. Read the maker's spec sheet for the station and the pump's label figures, then compare the two stated numbers.

For a full list of stations that state these figures clearly, the portable power stations for hurricanes guide is the place to start.

Preparing before the Florida season

The Florida Division of Emergency Management asks every family and business to have a predefined emergency plan and a stocked supply kit, and notes that each Florida county has a designated emergency management program for locally specific information. The Plan & Prepare page and the Disaster Supply Kit Checklist page, both in the sources below, are the first stops.

The National Weather Service advises checking emergency equipment, including generators, before hurricane season begins. The 'What to Do Before the Tropical Storm or Hurricane' page in the sources has the full checklist.

For generator operation, follow the maker's manual and read the CPSC, CDC and Florida Division of Emergency Management safety pages in the sources; this article does not restate their guidance. The generator carbon monoxide safety article explains the listing terms only.

What this article does not promise

This article does not promise that any wattage runs a sump pump, does not give runtime or fuel use figures, and does not size a home to a pump. Every pump label and every listing differs, and the site compares only the stated details in the listings.

Connecting a generator to a home panel, a transfer switch, or an inlet is a wiring question for a licensed electrician, the maker, and the local permit office. This site gives no wiring steps.

Fuel storage, flood and water behavior, repairs, and battery chemistry are all questions for the maker's manual. The sources below point to the official pages; nothing in this article replaces them.

What to pick for your situation

Questions

What are starting watts on a generator?

Starting watts is the brief surge of power a generator can deliver when a motor, like a sump pump, first kicks on. Running watts is the steady power it can supply afterward. For a motor, the starting figure is the one that most often decides whether the motor can start.

How do I find my sump pump's wattage?

Read the nameplate or label on the pump and the owner's manual. They usually state voltage, amperage, and wattage or horsepower. This site cannot look up your pump's figures and does not publish wattage tables that size a pump.

Can a power station run a sump pump?

A power station states a peak AC output and a continuous AC output. Whether a station can start your pump depends on the pump's starting draw and the station's stated peak figure. Compare the two stated numbers rather than relying on a rule of thumb.

Which is better for a Florida home with a sump pump: a generator or a power station?

Both state the figures you need in different units. A generator states starting and running watts; a power station states peak and continuous AC output plus a capacity in watt-hours. Which fits your pump depends on the pump's label and the stated figures in the listings.

Does this site promise a specific wattage for a sump pump?

No. The site compares listings on stated details only and does not publish wattage tables, runtime estimates, or fuel use figures. Read the pump's label, the maker's spec sheet, and the county emergency management guidance in the sources.

What should I check before hurricane season?

The Florida Division of Emergency Management recommends making a plan and building a supply kit, and notes that each Florida county has its own emergency management program. The National Weather Service suggests checking emergency equipment such as generators before the season begins. The sources below point to those pages.