How Long to Charge RV Battery With Generator

How Long to Charge RV Battery with Generator : 5 Factors

Last Updated on July 26, 2022

It’s difficult to give a definitive answer to the question of how long it will take to charge an RV battery with a generator. There are too many variables at play, including the capacity of the batteries, the output of the generator, how many appliances are running, and the number of batteries that are being charged. 

In general, it can take anywhere from two to ten hours to fully charge an RV battery. If your battery is low on power, it could take closer to 10 hours. If it’s almost full, it could take just 2 hours to reach full capacity. Ultimately, it depends on a variety of factors.

Throughout this piece, we’ll discuss some of the things that will affect the efficiency of charging an RV battery with a generator. We’ll also provide some tips on getting the most out of your generator while charging your batteries.

How Long to Charge RV Battery with Generator : Important Factors

Factors That Affect Charging Time

There are several factors that can affect the length of time it takes for a generator to charge an RV battery. These include:

The Capacity of The Batteries

It is one of the primary factors that determine how long it will take to charge. A higher-capacity battery will take longer to charge than a lower-capacity battery. The capacity of a battery is measured in amp-hours (Ah). The Ah rating is the number of amps that a battery can provide for an hour before it needs to be recharged.

For example, a 100 Ah RV battery will provide 1 amp for 100 hours, or 10 amps for 10 hours. The capacity of an RV battery is important because it determines how long the battery will last before needing to be recharged. A higher capacity battery will last longer than a lower capacity battery, and will therefore require less frequent charging.

Depth of Discharge (DOD)

When deciding how long to charge your RV battery, it’s important to consider the Depth of Discharge (DOD). It’s just a way to measure how much power you’ve lost.

A battery with a high DOD will take longer to charge than one with a low DOD. The reason for this is that a high DOD means that there is more work for the charger to do in order to bring the battery back up to full power.

If you have a high DOD battery, it’s important to be patient and allow it plenty of time to charge. On the other hand, if your lead acid battery has a low DOD, it will charge relatively quickly.

In general, it’s best to err on the side of caution and give your batteries sufficient recharge time, regardless of their DOD. By doing so, you’ll ensure that they’re always ready to go when you need them.

The Output of The Generator

Output from the generator is one of the key factors that determine battery charging time. While a higher output will obviously result in a faster charge, there are other factors to consider as well. For example, if the RV is equipped with a voltmeter, make sure to keep an eye on it during charging.

If the voltage begins to drop too low, it could indicate that the battery isn’t being charged properly and may need to be replaced. It’s also important to make sure that the generator is running at its rated speed, if it’s running too slow, it won’t produce enough power to properly charge the battery.

What Appliances are Running?

The time it takes to charge your RV battery will depend on the number of appliances you are running and the type of battery you have. If you are only running a few appliances, such as a fridge and a TV, then your battery will charge relatively quickly. 

Suppose you are running multiple appliances, such as lights, water pump, furnace, etc. Therefore, it will take longer to recharge your battery. Your battery type will also affect how quickly it charges. Lithium batteries tend to charge more quickly than lead-acid batteries, for example. Ultimately, the amount of charging time will vary depending on your specific circumstances.

Number of Batteries Being Charged

When it comes to recharging batteries, the quantity of batteries being recharged is an important factor to consider. If only one battery is being charged, it will obviously take less time than if multiple batteries are being charged simultaneously. This is because each battery bank must be individually charged in order to reach full capacity.

The type of charger being used can also affect charging time. For example, a standard charger will take longer to charge a lithium battery than a premium charger. Ultimately, the number of batteries being charged is a key determinant of how long it will take to recharge them. By taking this into account, individuals can ensure that their batteries are properly charged in a timely manner.

Tips for Charging RV Batteries With a Generator

Tips for Charging RV Batteries With a Generator

There are a few things you can do to make sure your RV battery charges efficiently with a generator. These tips include:

The Generator’s Power

The power of the generator is responsible for the time to charge the RV battery. A generator produces alternating current (AC), which is then converted to direct current (DC) by the RV’s converter. The DC voltage is then used to charge the RV battery.

The time it takes to charge an RV battery depends on the size of the battery, the type of battery, and the power of the generator. For example, a small 12-volt battery will take much less time to charge than a large 48-volt battery.

If you are using a generator over a solar panel with higher power output, it will take shorter times to charge your RV battery than with a lower power output generator. Therefore, it is important to consider the power of the RV generator when determining the time it will take to charge an RV battery.

Speed of The Generator

Generator speed is one of the determining factors in RV battery charging time. If the generator is running at its optimum speed, it can charge the battery in a shorter amount of time than if it is running at a slower speed. The reason for this is that the generator produces AC current, which is then converted to DC current by the charger.

The converter uses a rectifier to change the AC current into the DC current. The higher the speed of the generator, the higher the frequency of the AC current (shore power), and the more efficient the rectifier will be at converting it to DC current. As a result, running the generator at its optimum speed will help to ensure that the RV battery is charged in a timely manner.

Using a Battery Charger With Generator

When you use a battery charger to charge the batteries in your RV, you’ll notice that it charges the batteries much faster than if you were using the generator alone. This is because the charger provides a higher output of power than the generator, meaning that more power is going into the batteries.

As a result, they’ll charge up faster, giving you more time to enjoy your RV. Using a charger is more efficient this way, as it doesn’t waste any power. By using a battery charger, you can charge your RV batteries more quickly and efficiently, helping you to save time and money.

Cleaning The Batteries

This may seem like a small thing, but it can make a big difference in how long it takes to charge your RV battery. If the batteries are covered in dirt and grime, it will take longer for the charging process to work. When the batteries possess clean and free of debris, the charging process will be more efficient.

Making sure that the batteries are clean will help to extend their lifespan. Over time, dirt and grime can cause corrosion, which can damage the battery terminals and lead to premature failure. By taking the time to clean your batteries before each trip, you can help ensure that they will be ready to power your RV when you need them.

Maintaining the Generator

A generator is responsible for providing solar power to the RV battery, and if it is not well-maintained, the battery will not charge properly. luckily, there are a few easy steps that can be taken to keep the generator in good condition.

First, it is essential that the generator is always kept clean. Second, the oil should be changed regularly to ensure that the engine is running smoothly.

Finally, it is important to check the engine regularly for any signs of wear or tear. By taking these simple steps, you can help prolong the life of your generator and ensure that your RV battery always has a full charge.


These are some frequently asked questions that people have about the process of charging an RV battery with a generator.

Why is my generator not charging my RV battery?

This could be caused by a number of factors. First, make sure that the generator is turned on and that the circuit breaker is in the “on” position. If the generator is on but the circuit breaker is off, it won’t be able to charge the battery. Check to see whether the generator is properly grounded. If it’s not, it could be causing an electrical issue that’s preventing the battery from being charged.

Also, it’s possible that the battery itself is faulty and needs to be replaced. If you’ve checked all of these things and the generator still isn’t charging your RV battery, it’s best to consult with a certified RV technician. They’ll be able to diagnose the problem and get your generator up and running again.

Can you recharge an RV battery with an inverter generator?

Can you recharge an RV battery with an inverter generator

Yes, you can use an inverter generator to recharge RV batteries. In fact, this is a great way to keep your RV battery charged while you are on the road. An inverter generator converts AC power into DC power, which is what your RV battery needs to recharge. You can connect the inverter generator directly to the battery or use a charging station.

If you are using a charging station, be sure to read the instructions carefully so that you do not overcharge the battery. When charging the battery, it is important to monitor the voltage level and stop charging when the voltage reaches its peak. Overcharging can damage the battery and reduce its lifespan. Therefore, it is crucial to be careful when using an inverter generator to recharge an RV battery.

Will a 2000-watt generator charge RV batteries?

The answer depends on the size of your RV battery. A 2000-watt generator should be able to charge a 12-volt RV battery in about 10 hours. If you have a larger RV battery, you may need a higher-wattage generator. To be on the safe side, choose a generator with slightly more power than you think you need. 

That way, you’ll be sure to keep your batteries charged and avoid any potential problems down the road. For example, if you have a 24-volt RV battery, you will require a 3000-watt generator to charge it in 10 hours. Or, if you have two 12-volt batteries, a solar generator of 4000 watts will be needed to power them both in 10 hours. 

So, when choosing a generator for your RV, be sure to take into account the size of your batteries and choose accordingly. With a bit of planning, you can ensure that your RV batteries will always be charged and ready to operate.

How do I know if my generator is charging my battery?

It is possible to check whether your generator is charging your battery. First, check the manufacturer’s instructions to see if there is a recommended method for testing the charge. If not, you can use a voltmeter to measure the voltage of the battery while the generator is running.

If the voltage is below 12 volts, then the battery is not fully charged. You should also check the terminals of the battery to make sure they are clean and free of corrosion. If they are dirty or corroded, they may not be making good contact with the generator, which can result in an incomplete charge.

Last Words

The amount of time it takes to charge an RV battery with a generator can vary greatly. There are a number of factors that will affect the charging process, so it’s important to experiment to see what works best for your situation. With a little trial and error, you’ll be able to find the sweet spot for your RV battery charging needs.

Keep an eye on the battery during the charging process and to stop the generator if the battery begins to overheat. Ensure that the generator is properly ventilated during use. By following these guidelines, your RV battery will be charged properly and your generator will remain in good working condition.

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