What Size Generator Do I Need For Sump Pump?

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What Size Generator Do I Need For Sump Pump

What Size Generator Do I Need For Sump Pump

At some point, you may have asked yourself, “What size generator do I need for sump pump?” This is an important question to consider, as power outages can happen unexpectedly, and it’s crucial to have backup power for your sump pump to keep your basement from flooding.

Requirement By Sump Pumps:

The sump pump requires an energy backup for emergency shortfalls. The power outage has led people to seek alternatives for power solutions in case of uncertain electricity failures which can have disastrous effects.

So, having a generator at hand when the power goes out is a necessity for a homeowner to run a sump pump. Here is the question one potential buyer might ask himself what size generator do I need for the sump pump?

The answer here provided a detailed overview and perfect suitability for your requirements of the generator. 

What Size Generator Do I Need For the Sump Pump?

A 2000-watt generator is an initially smaller size for powering a sump pump. However, the better option relies on the size of a 3500-watt generator which doesn’t stress out the generator while working and is able to power other things in the home as well.

Why is the Right Generator Size Important for Your Sump Pump?

Sump pumps are designed to keep your basement from flooding by removing water that has been collected in the sump basin. If the power goes out during a storm, your sump pump will be rendered useless, and your basement may flood. This is why having a backup generator is crucial for homeowners.

Calculating the Right Generator Size for Your Sump Pump

To determine the appropriate generator size for your sump pump, you will need to consider a few factors:


The wattage required by your sump pump can be found on the manufacturer’s label or in the user manual. This will typically range from 1,000 to 3,000 watts.

Starting Amps:

Sump pumps require a higher starting current than a running current. The starting current can vary depending on the model and type of pump, but it is typically 2 to 3 times the running current.

Run Time:

The length of time that you need the generator to run will depend on the frequency and duration of power outages in your area. Consider whether you only need the generator to run for a few hours or if you require it to operate for several days.

Fuel Type:

Generators can run on different types of fuel, such as gasoline, propane, or diesel. Each fuel type has its advantages and disadvantages, such as cost, availability, and storage requirements. Choose the fuel type that is most convenient and affordable for your needs.

Once you have considered these factors, you can determine the appropriate generator size for your sump pump. For example, if your sump pump requires 2,000 watts to operate and has a starting current of 4,000 watts, you will need a generator with a minimum capacity of 4,000 watts.

It is necessary for you to know!

Types Of Sump Pumps:

The size of the sump pump can either be 1/3 HP or ½ HP. ½ HP sump pump requires 600-800 watts for running and 1300-1600 watts as starting watts. The 1/3 size sump pump requires 800-1000 watts rated and 1500-2150 watts starting wattage for the unit. The startup wattage of any device is higher than its required running wattage as it regulates the operation in the first few seconds and drops out the wattage once run continuously.


For both sized sump pumps to power, the best suitable generator is the Champion 4375 portable generator that allows the working for 12 hours with 50 percent load on the tank while acquiring starting wattage of 4375 watts and rated wattage of 3500 watts.

This extends your option to power other devices as well. The decibel level of the generator is about 68 dba from 23 feet apart. The portability of the generator allows its safe storage with low maintenance quality which provides peace of mind.

FAQ’s What Size Generator Do I Need For Sump Pump?

Q 1.) How Many Watts Do You Need to Run a Sump Pump?

Ans: The wattage required to run a sump pump typically ranges from 1,000 to 3,000 watts.

Q 2.) What Generator Do I Need to Run a Sump Pump?

Ans: To run a sump pump, you will need a generator with a capacity that meets the pump’s starting current, which is typically 2-3 times the running current. The minimum generator capacity is usually 4,000 watts.

Q 3.) Do You Need A Generator If You Have a Sump Pump?

Ans: You necessarily need a generator if you have a sump pump. Because, having a generator provides backup power during power outages, ensuring that your sump pump remains operational and your home remains protected from flooding.

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