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What Size Inverter Do I Need For My Camper

Camper inverters can range in size from a modest 100 watts all the way up to a whopping 5000 watts or even higher.

While a 1000 to 1500 watt inverter will meet the needs of many campers, determining the ideal size for your specific situation depends on several factors including the biggest power draw of your camper and your overall power requirements.

Assessing Your Power Needs

To determine the appropriate size of your power inverter, you must first take stock of the appliances you plan to use and their specific power needs.

Your RV will likely be outfitted with a variety of AC appliances such as laptops, TVs, hairdryers, induction hobs, power tools, air conditioners, cooling fans, and many other electronic devices.

And each of these will have its own power requirement.

For instance, while a laptop might only need a 250W inverter, a hairdryer could be required up to 1500 watts of power.

A. Estimating Total Power and Energy Requirement

The next step is to estimate the total energy consumption of the camper. For this, note the wattage of all your appliances, and add them up. To account for any additional power needs, add 20% to the total wattage.

This will give you an idea of how many watts your RV consumes and how much power your inverter will need to provide.

B. Importance of considering surge power and continuous power

When selecting an inverter, it’s crucial to consider both surge power and continuous or running power. Surge power refers to the maximum power output an inverter can handle for a short period, while continuous power is the inverter’s constant power output.

Ensure that the inverter you choose can handle both the surge and continuous power requirements of your RV appliances to avoid any potential issues.

C. AC power, DC power, and the role of inverters in RV power systems

RV power systems involve both AC (alternating current) and DC (direct current) power. Inverters play a vital role in RV power systems by converting DC power from your RV batteries into usable AC power for your appliances.

Understanding Camper and RV Inverter Sizes

In this section, we will explore the different size categories of camper and RV inverters, which are essential for powering appliances and electronic devices.

I. Small Inverters (100W to 300W)

Small inverters are suitable for powering devices such as laptops, smartphones, tablets, and small LED lights. Their compactness and cost-effectiveness make them an attractive option for campers with minimal power needs.

II. Medium-sized Inverters (300W to 1,000W)

Medium-sized inverters are capable of supporting a broader array of appliances, such as TVs, microwaves, blenders, and small power tools, and are suitable for campers with moderate power requirements. These inverters often come with added features like USB ports or built-in chargers.

III. Large Inverters (1,000W to 3,000W)

Large inverters are designed to meet higher power demands, supplying energy to appliances like air conditioners, refrigerators, and induction hobs. While these inverters are well-suited for campers with significant power needs, they are more expensive and require a more extensive battery bank.

IV. Extra-large Inverters (3,000W and up)

Extra-large inverters cater to heavy-duty applications in larger RVs or motorhomes with multiple high-power appliances, like multiple air conditioners or large residential refrigerators. These inverters require a significant battery bank and may necessitate additional electrical system upgrades.

Selecting and Sizing Your Camper Inverter

Before installing the selected inverter in your RV, choosing the right inverter type and inverter power for your camper or RV is essential. This mainly depends on your appliances and electronics and the size of your battery bank.

An inverter that meets your power needs will ensure a seamless RV experience without compromising the performance of your appliances. In this section, we will talk about two types of inverters you can use and provide you with a step-by-step method to size your RV inverter.

A. Pure Sine Wave Inverters vs. Modified Sine Wave Inverters

There are two main types of inverters for RVs: pure sine inverters and modified sine wave inverters.

Pure sine wave inverters provide a smooth, continuous output that closely resembles the power provided by wall outlets, making them the best choice for most devices, including newer electronics and sensitive equipment.

These inverters are ideal for medical equipment like CPAP machines and sensitive electronics that require clean and consistent power. They tend to be more efficient and provide better performance overall.

Modified sine wave inverters, on the other hand, generate a stepped output that is more suited for pumps, motors, and equipment with a DC brick power supply.

These inverters are better suited for older devices and appliances with heavy motor loads, such as power tools and certain kitchen appliances. They are usually less expensive but may only be compatible with some devices.

B. Camper Inverter Size Calculator: A Step-by-Step Guide

To calculate the appropriate size of inverter for your camper, follow these steps:

  1. Determine the peak power and continuous power of your appliances. The peak power is the maximum power required by an appliance during startup, while continuous power is the amount needed for regular operation.
  2. Choose an inverter with a peak power rating slightly higher than the highest peak power of your electrical devices to account for any unexpected surges.
  3. Add up the continuous power requirements of all your appliances. This will give you the total continuous power needed for your RV.
  4. Select an inverter that can handle the combined continuous power requirements of your appliances. It is recommended to choose an inverter with a capacity of 20% more than your calculated continuous power needs to ensure optimal performance and efficiency.
  5. Consider the type of inverter that suits your needs best, either a pure sine wave inverter or a modified sine wave inverter, based on the appliances you plan to use in your RV.


By following these steps, you can determine the right size of the inverter for your RV and ensure a smooth and enjoyable RV experience without any power-related issues.

Other Factors to Consider

Besides the size and type of inverter, various other factors can impact your choice of an inverter for your camper or RV. In this section, we’ll discuss a few of these factors to help you make a well-informed decision when choosing an inverter for your RV.

A. Battery Considerations for Your Power Inverter

Make sure that your battery system has enough power and capacity to meet the needs of your inverter.

As a general rule of thumb for how big your battery bank should be, you should have at least 100Ah of battery capacity for every 1,000 watts your inverter can handle.

Keep in mind that the type of battery you choose, like lead-acid or lithium batteries, will affect how well your power system works and how long it lasts.

B. Electrical System Compatibility

Ensure the inverter you select is compatible with your RV power system and the entire electrical system, as this will help preserve the integrity and efficiency of your setup.

C. Solar System and Generator Integration

If you plan to incorporate solar power into your RV power system, consider how the inverter will function with solar panels and any generator power you might employ.

Choose an inverter that supports multiple power inputs and can switch between battery banks, solar panels, and generators depending on the requirement. This will enable you to optimize your system efficiency.

D. Off-grid Lifestyle and its Impact on Inverter Size Requirements

It is important to ensure you’re well-prepared when spending time off grid. In such cases, your inverter size requirements may differ from those that primarily use shore power.

The off-grid RV lifestyle demands a more robust and reliable inverter, as it needs to handle a broader range of power requirements without access to external power sources.

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