What Size Battery Do I Need For My Generac Generator?

Selecting the right battery size is crucial for ensuring reliable and efficient performance from your Generac generator.

With various factors to consider, including the generator model and desired runtime, it can be challenging to determine the appropriate battery size.

In this blog, we will provide a comprehensive guide to help you choose the right size battery for your Generac generator, ensuring you have the power you need when you need it.

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what size battery do I need for my general generator?

For most general generators, a 12-volt battery with a minimum of 35-amp hours (AH) is sufficient. If your generator has a higher power output, you may need a larger battery with a higher AH rating. The battery size for your general generator depends on the generator’s power output and the type.

General Generator Battery Size Chart:

Power Output (Watts)	Battery AH
Up to 1000	35
1000-2000	50
2000-3000	75
3000-5000	100
5000-7500	150
7500-10000	200

Basic Factors to Consider When Choosing a Battery for Your Generac Generator

Selecting the right battery for your Generac generator is crucial.

By considering the below factors, you can choose a battery that is compatible with your generator and meets your energy needs.

Battery Type

One of the first things to consider when choosing a battery for your Generac generator is the type of battery.

Generac generators typically require a lead-acid battery, which can be either a flooded cell or a sealed AGM battery.

AGM batteries are more expensive but require less maintenance and are less prone to spillage.

Battery Size

The size of the battery you choose is also an important consideration.

Generac generators require a specific battery size that is compatible with the generator model you own.

Ensure that you choose a battery that fits the dimensions and specifications of your generator.

Battery Capacity

The battery capacity is the amount of energy of the battery.

A higher capacity battery can provide longer run times, while a lower capacity battery requires more frequent recharging.

Consider the expected usage of your Generac generator to determine the battery capacity that will best suit your needs.

Battery Brand

Choosing a reputable battery brand is important for ensuring that you get a high-quality battery that will perform reliably.

Look for batteries from well-known brands with a good reputation in the market.

Battery Maintenance

Finally, consider the maintenance requirements of the battery you choose.

Some batteries require regular maintenance, such as adding water or checking the electrolyte levels.

Others are maintenance-free and require little to no attention. Choose a battery that suits your maintenance preferences and skill level.

How to Determine the Battery Size Required for Your Generac Generator

By following the below steps, you can determine the appropriate battery size for your Generac generator.

Check the Generator Manual

The first step in determining the battery size required for your Generac generator is to check the generator manually.

The manual will typically list the recommended battery size for your specific generator model.

Look at the Current Battery

If you already have a battery installed in your Generac generator, you can check the battery for information on its size and specifications.

The size of the battery may be printed on the battery case or in the owner’s manual.

Check the Battery Compartment

 If you don’t have the manual or the current battery isn’t labeled with its size, you can check the battery compartment for information.

The battery compartment may have a sticker or label indicating the recommended battery size.

Measure the Battery Compartment

If you are unable to find any information on the recommended battery size, you can measure the battery compartment to determine the size of the battery that will fit.

Measure the length, width, and height of the compartment and choose a battery that fits within those dimensions.

Consult a Professional

If you are unsure about the battery size required for your Generac generator, you can consult a professional for assistance.

A qualified electrician or Generac dealer can provide guidance on the appropriate battery size for your generator model.

Different Types of Batteries Compatible with Generac Generators

Here are some different types of batteries for Generac generators.

Flooded Lead-Acid Batteries

Flooded lead-acid batteries are a traditional battery type that is commonly used with Generac generators.

These batteries are affordable and widely available, but they require regular maintenance, including adding water and checking the electrolyte levels.

Sealed AGM Batteries

Sealed AGM (Absorbent Glass Mat) batteries are a newer type of battery that is also compatible with Generac generators.

These batteries are more expensive than flooded lead-acid batteries but require less maintenance and are less prone to spillage.

They are also more durable and can provide better performance in extreme temperatures.

Lithium-Ion Batteries

Lithium-ion batteries are becoming more popular for use with Generac generators due to their lightweight and high energy density.

These batteries provide longer run times and faster recharging times than lead-acid batteries, but they are also more expensive.

Gel Batteries

Gel batteries are another type of sealed battery that is compatible with Generac generators.

These batteries are similar to AGM batteries but use a gel electrolyte instead of a liquid, making them less prone to leakage and more durable.

Deep Cycle Batteries

Deep cycle batteries are designed to provide a steady and consistent flow of power over a longer period.

These batteries are ideal for use with Generac generators that require extended run times.

They can be either flooded or sealed and are available in a variety of sizes and capacities.

How to Choose the Right Battery Based on Your Specific Generator Model

 Choosing the right battery is important for ensuring reliable performance and extended use of your generator.

Check the Manual

The first step in choosing the right battery for your Generac generator is to check the generator manually.

The manual will typically list the recommended battery size and type for your specific generator model.

Consider the Environment

The environment in which your Generac generator will be used can also affect the choice of battery.

If your generator will be used in extreme temperatures, a lithium-ion or AGM battery may be a better choice than a flooded lead-acid battery.

Look for Compatibility

When choosing a battery for your Generac generator, make sure it is compatible with the generator’s charging system.

Some batteries may require a specific charger or charging system, so it’s important to check the specifications to ensure compatibility.

Consider Capacity

The capacity of the battery is another important factor to consider when choosing a battery for your Generac generator.

A battery with a higher capacity is able to provide power for a longer period before needing to be recharged or replaced.

Look at Reviews

Reading reviews from other Generac generator owners can also be helpful in choosing the right battery.

Look for reviews from owners of the same model as yours to see what type of battery they recommend and how well it performs in real-world conditions.

Maintaining Your Generac Generator’s Battery: Tips and Best Practices

By following some tips and best practices for maintaining your Generac generator’s battery, you can ensure reliable performance and extended use of your generator. 

Keep it Clean

Regularly cleaning your Generac generator’s battery can help prevent corrosion and extend its lifespan.

Use a wire brush or battery cleaner to remove any dirt or debris, and wipe down the battery with a clean cloth.

Check the Electrolyte Levels

If you have a flooded lead-acid battery, it’s important to regularly check the electrolyte levels and add distilled water if necessary.

This can help prevent damage to the battery and ensure reliable performance.

Keep it Charged

Keeping your Generac generator’s battery charged is crucial for maintaining its health and longevity.

Make sure to start your generator and run it for a few minutes at least once a month to keep the battery charged.

If you have a lithium-ion or AGM battery, make sure to follow the manufacturer’s recommendations for charging.

Test the Battery

Testing the battery regularly can help you identify any issues before they become more serious. Use a multimeter to check the voltage of the battery and compare it.

Replace When Necessary

Even with proper maintenance, batteries will eventually wear out and need to be replaced.

Keep an eye out for signs that your Generac generator’s battery may need to be replaced, such as slow starting or reduced run time.

FAQs

Final Words

Selecting the right size battery for your Generac generator is crucial for ensuring reliable performance and extended use.

Refer to the generator manual or contact the manufacturer for recommended battery size and type.

Using a battery that is too small or too large can cause damage to your generator and result in decreased performance.

By following the manufacturer’s recommendations and proper maintenance, you can ensure your Generac generator’s battery lasts as long as possible.