How Long Will a Deep Cycle Battery Power an Inverter

A deep cycle battery is a rechargeable battery that can discharge and charge more than 50 times. Most people are confused about how long will a deep cycle battery power an inverter, especially when they are looking for the answer online. The answer to how long a deep cycle battery will power an inverter depends on many factors.

How Long Will a Deep Cycle Battery Power an Inverter

The two most important factors when choosing a battery inverter are size and capacity. There are two types of inverters, modified sine wave and true sine wave. Modified sine wave inverters can only be used with batteries that have a rating equal to or higher than the inverter’s rating.

12 Factors on How Long Will a Deep Cycle Battery Power an Inverter:

1. Size and Capacity:

The size of the battery will determine how long it can power an inverter. The larger the battery, the longer it can run the inverter or appliances connected to it.

A deep cycle battery with a 20 amp hour rating can usually power an average home for 4 hours, while a 400 amp deep cycle battery can last for over 9 hours. The reason the larger battery will last longer is that it can store more power than a smaller one.

2. Battery Voltage:

The amount of time a deep cycle battery can power an inverter is determined by its voltage output. Most deep cycle batteries have a voltage output of 12 volts.

However, some come in 6 volt and 24-volt versions. The voltage rating of a battery must match the requirements of an inverter for it to work properly. 

3. Battery Amp Hours (AH):

The amp hour rating or Ah determines how fast you can discharge your battery’s power supply. The amp hour rating measures the amount of usable capacity that a battery can provide. For example, if you have a 100 Ah rated battery and use an appliance that draws 40 amps, it will take 2 hours to drain your battery completely.

Battery Amp Hours

4. Inverter Rating:

Inverters are devices that change 12-volt DC electricity into 110-volt AC. They are used to power appliances from a battery for extended periods when the main electricity supply isn’t available. Inverters have an input and an output, both of which must match that of the deep cycle battery you’re using, or it will severely damage your equipment’s power supply.

5. Quality of Inverter:

Although there are many inverters in the market today, not all of them are up to par with your deep cycle battery. You have to make sure that your inverter is producing a true sine wave and has steady output. Poor quality inverters can damage or overheat your batteries, causing them to lose power quickly.

6. Type of Appliance:

The type of appliance you’re using also affects the length of time a deep cycle battery can power it. For example, a standard 60-watt bulb shouldn’t take more than half an hour before your battery runs out, while a laptop or small refrigerator may last for a couple of hours. This is because the longer the appliance runs, the more power it draws from your battery.

7. Size of Appliance:

You also have to consider the size of the appliance you’re using. The larger the appliance, the more power it draws from your battery. For example, a large air-conditioning unit will drain your deep cycle battery much faster than an electric fan would. This is because appliances with larger motors usually need more power to work.

8. Length of Use:

The amount of time you’ll be using your appliances also determines how long a deep cycle battery can power them. If you’re only going to use the appliance or equipment briefly, it’s better to run the inverter and turn off the battery backup system. But if you need extended power or your appliances are not energy efficient, it’s best to use a battery backup system.

Use a Battery Backup System

9. Weather:

The weather is another factor that helps determine how long a deep cycle battery can power an inverter. In extreme heat and cold, batteries wear out much faster than during periods of.

Turn it on only when the DC power supply is out. This way, your battery can last longer, and you won’t have to recharge it as often as if you were using it continuously.

10. Charging Efficiency:

Your deep cycle batteries will not last long if they are being overcharged or undercharged. If you’re not sure how to charge your deep cycle batteries, then it’s best to talk with a dealer or manufacturer and ask for their recommendations. They will also determine if your charger is working properly or not based on its model number.

11. Running Time between Charges:

Since deep cycle batteries are designed to provide large amounts of power over extended periods, their life span is greatly reduced if they are continually charged and recharged.

This doesn’t mean that you shouldn’t recharge your batteries after use because doing so will help keep them in good condition. However, it’s best to recharge them only once the power has been restored to your area or if they have been drained completely.

12. Maintenance:

The length of time a deep cycle battery can power an inverter depends on how well you maintain it. If your batteries are not stored and used properly, they will have little or no power to use when fully charged.

This is because batteries that aren’t maintained well tend to discharge quickly and fail sooner than if they were well-maintained.

Things To Consider When Powering an Inverter with Deep Cycle Battery:

1. The amount of power an inverter draws from a battery depends on the voltage and the current required by the appliance connected to the inverter (amps).

2. A conventional deep cycle battery is designed to provide over 20 hours of discharging time at its rated amp-hour capacity when it is new.

3. Deep cycle batteries can be recharged using DC power from another source, such as an inverter.

Using Dc Power From Another Source

4. The amp-hour capacity of a deep cycle battery is reduced over time and usage – even when it is not being recharged.

5. Deep cycle batteries that are regularly recharged will lose their life span slowly but surely until they can no longer be recharged, even if they are not used for an extended time.

6. There is a limit to how much current the inverters can handle and the maximum amount of voltage required when powering appliances.

7. The level to which the battery charge has been depleted will also determine how long a deep cycle battery will last.

Difference Between Car Battery and Deep Cycle Battery:

Here are some of the differences between deep cycle and car batteries that you should know about.

Car Battery

Car batteries transmit power in short bursts, which makes them great for your vehicle’s ignition system. They can also produce large amounts of current when necessary to crank your engine and power your lights and accessories.

But they have a poor lifespan when used continuously or for long periods of time. They are also less resistant to vibration, shock, temperature changes, and deep discharge cycles than deep cycle batteries. Deep Cycle Batteries For Boats

Deep Cycle Battery

RVs typically use 12-volt deep cycle batteries that are perfect for off-grid power supply. These batteries have a longer lifespan compared to car batteries. Deep cycle RV batteries and solar panels offer several benefits over traditional lead-acid batteries.

It can be used in conjunction with an alternative energy source or in a standalone application, which would make it a great addition to your off-grid system. These batteries are also less expensive, which can save you a significant amount of money in the long run.

Is Deep Cycle Better Than Car Battery?  

The term deep cycle is used when a battery can be discharged by 50% or more before recharging, unlike car batteries made for recharging after a full discharge. Deep cycle batteries are used in golf carts, boats, and some larger vehicles or other applications that need to stay powered for long periods of time.

Used Discharged by 50% or More Before Recharging

If we are talking about something that will be used seldom and for short periods of time, such as a ham radio, where you don’t need to run it very long each time, or if you use it maybe once or twice a month, then a car battery can be used.


In conclusion, connecting the inverter directly to the batteries via a DC isolator is better than running an extension cord from the inverter to a wall outlet because both of these methods are efficient, but they may not be cost-effective.

As you can see, how long will a deep cycle battery power an inverter would depend on the size and type of your battery and how much power is being drawn from your inverter. We hope this was helpful, and more information about deep cycle batteries will be provided in a future blog post. So Stay tuned!

Jennifer Branett
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