RV Inverter Wiring Diagram

RV inverters are a crucial component in any recreational vehicle, allowing you to convert DC power from your RV’s battery into AC power that can run appliances and electronics. In order to properly install and wire an RV inverter, it’s important to have a clear understanding of the wiring diagram.

This article will walk you through a typical RV inverter wiring diagram and explain the various components and their functions. We will also provide tips and best practices for safely and effectively installing and wiring your RV inverter.

Whether a seasoned RV enthusiast or a first-time camper, this article will provide the knowledge and understanding you need to get your RV’s power system up and running smoothly.


Source Image

RV Inverter

An inverter is an electronic device that converts low-voltage DC electricity from a secondary battery, such as a 12V battery, into high-voltage AC electricity, typically 220V. This allows common household appliances and devices, such as laptops, to be powered using a standard plug. The inverter functions by altering the current’s waveform, allowing for the transformation of the voltage.

Two types of RV inverters are available in the market right now:

1.     Pure Sine Wave Inverter

A pure sine wave inverter generates an AC power output that closely resembles the waveform of the electricity supplied by the utility company. This type of inverter is particularly useful for powering devices with motors, such as refrigerators and air conditioners, as these devices require a consistent, stable power supply to function properly.

However, pure sine wave inverters are generally more expensive than other types due to their more advanced technology and higher performance.

2.     Rectified Wave Inverters

Rectified wave inverters are a type of inverter that produces a square wave output that is supposed to mimic the power output of a pure sine wave inverter. These inverters are typically used for powering simple devices such as televisions, computers, and other electronic devices that do not have motors.

They are generally less expensive than pure sine wave inverters, making them a more cost-effective option for some RV owners. However, the main disadvantage of rectified wave inverters is that they are not compatible with appliances that have motors or heating elements, such as hair dryers. This is because these devices require a stable power supply to function properly, and rectified wave inverters cannot provide this performance level.

Wiring Diagram

Things To Consider While Choosing An RV Inverter

1.     Power Usage

When selecting an inverter, it is important to consider both the nominal and peak power ratings. The nominal power is the power the inverter can provide during normal, continuous use. In contrast, peak power is the maximum amount of power the inverter can provide for a short time.

If an appliance requires more power than the inverter can supply, it can cause the fuses or the inverter to blow. It is important to consider the peak power requirements of the appliances you plan to connect to the inverter to ensure that the inverter can handle the load.

For example, if you plan to connect a computer to the inverter, the computer typically consumes 240 watts. Still, starting up may require 500 watts of peak power, so the inverter must be able to provide that amount of power.

2.     Battery Capacity

When choosing an inverter, it is important to consider the electricity demand of the devices you plan to connect to it and whether your batteries can supply that power. Failing to do so can result in the batteries running out of power quickly, not because of the inverter but because the stored electricity in the batteries is not enough to meet the demand of the device.

It is also important to avoid running the inverter at full capacity for an extended period, as this can cause the inverter to overheat and malfunction. To ensure optimal performance, the inverter is recommended to work at around 70% of its capacity.

If you plan to connect a device, such as a computer, that requires 240 watts of power, it would be best to purchase a 400-watt inverter instead of a 300-watt inverter. This way, you will have a sufficient margin to accommodate unexpected power demands.

3.     Size and Weight

When choosing an RV inverter, size and weight are important factors. The inverter’s size must fit into the limited space available in an RV and be portable enough to be taken on the go.

The size of the inverter will determine how much space it takes up in your RV. If you have limited space, you may consider a smaller inverter that can still meet your power needs. On the other hand, if you have more space, you may want to consider a larger inverter that can provide more power.

The weight of the inverter is also an important factor to consider, as it needs to be portable enough to take with you on the go. If you plan to move your RV frequently, you may want to choose a lighter inverter that is easy to transport. However, if you plan to keep your RV in one place, the weight of the inverter may not be as important.

4.     Safety Features

Safety is an essential aspect to consider when choosing an RV inverter. The inverter must have built-in safety features that protect the inverter and connected devices from damage, such as over-voltage protection, short-circuit protection, and over-temperature protection, which prevents the inverter from overheating and shutting down. Additionally, a ground fault circuit Interrupter is a great safety feature to have in the inverter.

Determining The Power Usage On Your RV

To determine how much power you need in your RV, you must calculate the total power consumption of all the devices you plan to run simultaneously. Here are the steps to determine your power needs:

  • Make a list of all the devices you plan to run in your RV, such as lights, appliances, and electronics.
  •  Look for the power rating of each device in watts (W). This can typically be found on the device or the product manual.
  • Add up the total power consumption of all the devices on your list. This will estimate the total power you will need to run all your devices simultaneously.
  • Consider additional power needs, such as running an air conditioner or charging your RV batteries.
  • Add a 20-30% margin to the total power calculation to account for any unexpected power needs or future additions to your RV setup.
  • Choose an inverter that can handle your calculated total power needs. It’s recommended to have a slightly higher power inverter than the total power needs, as it will ensure you have enough power to handle any unexpected situations.

Installing RV Inverter

Installing an RV inverter can be a complex process requiring electrical knowledge and the proper tools. An RV inverter is a device that converts the DC power from your RV’s battery into AC power, allowing you to use standard electrical devices while on the road. In this article, we will go over the general steps for installing an RV inverter.

Determine the location of the inverter in your RV. It should be placed in a dry and well-ventilated area, away from heat sources and flammable materials. This is important to ensure that the inverter does not overheat and cause damage to itself or your RV.

Ensure that the inverter has a battery disconnect switch and is in the OFF position. This switch is an important safety feature that helps to prevent the inverter from drawing power from the battery when not in use.

Run the power cables from the battery to the inverter, making sure to use the appropriate gauge wire for the power load. The wire’s size will depend on your inverter’s power load and the distance between the battery and the inverter. It’s important to use the right size wire to prevent voltage drop and ensure the electrical system’s safety.

Connect the positive cable to the positive terminal on the inverter and the negative cable to the negative terminal. Make sure that the connections are secure and free of any damage. Turn the battery disconnect switch to the ON position. This will allow power to flow from the battery to the inverter.

Turn on the inverter and test it by plugging in an electrical device, such as a lamp or a TV, to the inverter’s AC outlet. This will ensure that the inverter is working properly and that the output voltage is within the acceptable range.

Once you have confirmed that the inverter is working properly, you can mount it in its final location. Ensure that the inverter is securely mounted and has enough clearance for proper ventilation.

Tips For Safe Installation

  • Always include a fuse between the battery and power inverter as a safety measure. 
  • A fuse will protect the installation in case of a short circuit. 
  • It’s important to ensure that the inverter is installed in a well-ventilated area, especially if it will be used continuously, such as for powering a 220V refrigerator.
  • Proper ventilation will prevent the inverter from overheating and causing damage.

Final Words

Installing an RV inverter is a complex process that requires some electrical knowledge and the proper tools. It’s important to follow the manufacturer’s instructions and use the appropriate gauge wire for the power load. 

You should regularly check the wiring, connections, and battery disconnect switch to ensure the system is in good working condition. In this way, you can confirm that your RV inverter is installed safely and efficiently, allowing you to enjoy all the comforts of home while on the road.


Leave a Comment