A Campervan & motorhome inverter is a device that transfers the DC power from your motorhome’s battery to AC power that you can use to power your appliances and electronic devices. This is a good device to have if you plan to travel in your campervan, especially if you have to power any large electrical appliances, such as a refrigerator.
There are two main types of inverters that you can buy. There are pure sine wave inverters and modified sine wave inverters. Pure sine wave inverters are more expensive, but also more reliable than modified sine wave inverters. Modified sine wave inverters are cheaper but more prone to failure and can end up damaging your appliances.
What Does an Inverter Do in a campervan?
There are a lot of electric devices that need 120v of AC power in order to run. When a motorhome gets plugged in to shore power, you are using the cable to give your motorhome a source of 120v of AC power.
The problem is that the battery in your motorhome only provides 12v of DC power. This means that when you are relying on your motorhome’s batteries for power, you need to have an inverter to convert the 12v of DC power into 120v of AC power.
If you do not use an inverter in your campervan, you may have to run a generator outside in order to power your motorhome. This is fine and a lot of people choose to do it, especially if they have an older motorhome that does not have as much power as a larger one.
Running a generator might not be an option for you, however. You might be somebody who works from the road for example. You also might simply just not want to hear the drone of a generator running all night. If this is the case, you need to get a motorhome inverter.
What Is the Best Size Inverter for a campervan?
The size of inverter that will work best for your motorhome depends on your specific needs and the capabilities of your motorhome.
Do you know what appliances and electronic devices you plan on running? Do they need to be running at the same time? You should try to strategically plan your appliance use to avoid overwhelming your inverter.
This would include small things such as not making toast and coffee at the same time, to larger ones such as avoiding straightening your hair with hair straighteners while running the air conditioner unit.
How big is your battery bank? This is another important factor to consider. If you only have a single battery or a small house battery bank, you will not be able to use your inverter for very long. The smaller your physical battery bank, the smaller your inverter will have to be.
You also need to think about what your highest power draw is going to be. Some appliances and electronic devices tend to have a high surge in power when you first turn them on.
These are often three to five times the running wattage of the device in question, but you still have to account for this when you are thinking about how much power your inverter can handle.
Most likely, your inverter will be able to handle short surges in power. You should carefully read the instructions however to know exactly what your inverter can power and for how long.
Some manufacturers will list the inverter size as the maximum rating. It is only in small print that the inverter can only handle a much smaller amount of power for a long period of time.
The key to finding the best size of inverter that you need is to add up the wattage of all the devices you want to power, and the surge requirements for all of these devices. Once you have calculated this total, you should add another twenty percent to it to make up for any extra loads on the system.
How Long Will a 12v Battery Last with an Inverter?
How long your 12v battery will last with an inverter depends on the size of the battery, the inverter that you use, and how many devices that you are powering.
You also have to consider the fact that your inverter will draw some power from your battery automatically, even if you do not have any devices or appliances plugged into the inverter.
The math to calculate how long a 12v battery will last with a motorhome inverter is pretty simple. You just need to multiply the battery amp hours (Ah) by twelve to calculate the number of Watt hours.
Then you divide this by the number of load hours to find out the total number of hours that your 12v battery will last when you are using it with an inverter. You should then multiply this by 95% to adjust for any energy losses with the inverter.
Should You Leave Your Inverter Running All the Time?
This depends on what you need to power. For example, if you have something like a refrigerator that needs to be on all the time, you should probably try to keep your inverter running all the time so that your food does not spoil.
A lot of people who have residential refrigerators in their motorhomes prefer to leave their inverter on even when the motorhome is plugged in to shore power or a generator. This is because they want a backup and do not want to risk their food spoiling due to a power blackout or generator malfunction.
How Does a Motorhome Inverter Work?
The difference between Direct Current (DC power) and Alternating Current (AC power) is that DC is a constant stream of power while AC shifts up and down between +120V to -120V in a rhythm.
The power inverter on your mobile home changes 12V of DC current to 120V of AC current by increasing the voltage of the power and then adjusting it so that it alternates. In simpler terms, it amplifies the 12V of DC current energy into 120V of AC energy.
This is not the only thing that a motorhome inverter does though. They also have bypass circuitry, especially on more advanced inverters. This means that when your motorhome is plugged in to shore power, the inverter will stop draining power from the batteries. This lets power from your generator flow through the circuits so that your batteries can recharge.
There are even some advanced inverters that have a special feature that allows you to use a “Hybrid” mode, also sometimes called “Power assist”.
These inverters are special. If the generator (or other source of shore power) does not have the capacity to meet the energy needs of your motorhome, it will allow you to use some of the energy from your battery. This lets you meet your energy needs without overwhelming the generator or draining your battery.
There are other types of inverters that take a different route. They control the loads on the circuits that they are powering so that you do not need as much power from the shore generator or your motorhome’s battery.
They monitor the load being pulled by the devices that they power. When that passes over a particular threshold, the inverter returns to “invert” mode. This takes these loads out of the draw on the generator or other source of shore power.
No matter what type of inverter that you have, using one allows you to use a lot more power in your motorhome than you would be able to if you were relying entirely on generator power.
How to Use Inverter in Motorhome?
There are a lot of different levels of motorhome inverter that you can get. Whatever type you have though, you probably won’t be able to use it to power all of the electric devices that you have onboard your motorhome. It will depend on how your manufacturer wired your motorhome to know how much you can power with your inverter.
The simplest type of inverter is not built into the motorhome at all. This type of inverter is a portable unit that you can plug into your cigarette lighter.
These are usually low power units that give you anywhere from 200 to 400 Watts of electricity. You can access this electricity by using the one or two 120V AC outlets that comes with the inverter.
This is a good option if your motorhome did not come with a built in inverter, and if you only need enough power to charge a couple of small electric devices. These portable inverters have a small capacity and usually cannot power large devices.
It is also possible that you will have a motorhome that already comes with an inverter pre-installed when you get it from the factory. This pre-installed inverter is connected directly to the 12V battery bank, and it will have a control panel somewhere inside the motorhome that you can use to turn the inverter on or off.
The number and size of the electronics that you can power with these built in inverters depends on the size of the inverter. There are some built in inverters that still have small capacities and can only charge one or two relatively small devices such as a CPAP machine, laptop, TV, or DVD player.
It is also possible that your inverter will be specifically wired to an individual circuit breaker box that has designated circuits, such as one for your TV, one for your microwave, as well as any or all of the outlets in your motorhome.
These inverters usually are not connected to any large devices such as your water heater, laundry machines, refrigerator, or your air conditioner.
It is rather rare, but there are still some motorhome inverters that can be wired to give power to your entire motorhome. Even with these inverters, you still need to be careful to not overload the inverter by powering too many appliances with them all at the same time.
You should be especially careful about running too many large devices at once that need a lot of electricity. You also have to be careful about not draining too much of the motorhome’s battery by using it to power all of your gadgets at once.
Different Types of Motorhome Inverters
There are two main varieties of motorhome inverter. You can find pure sine wave and modified sine wave inverters. The primary difference between these two types has to do with their cost and their efficiency.
Pure sine wave inverters are more expensive but also more efficient than the modified sine wave inverters. Even though they are more expensive than modified sine wave inverters, their price has also been going down in recent years.
Pure sine wave inverters provide the exact same kind of power that you get from the 120v AC power in your home. This is the type of power that all electric appliances and devices are intended to use.
Modified sine wave inverters are cheaper than pure sine wave inverters, but they are less efficient. They do not provide the exact same duplicate of 120v AC power that you can get from a pure sine wave inverter. This can sometimes cause problems and even failure with your electric devices.
Modified sine wave inverters are cheaper than pure sine wave inverters, but they are less reliable, and they can even cause damage to your appliances and electronic devices if you continue to use them over time.
There are some types of electric appliance are more likely to suffer from failure than others. These include:
- Electric blankets
- Coffee makers
- Digital clocks
- Medical equipment
- Photocopiers and laser printers
- Stereo equipment
- Battery chargers
Another problem with modified sine wave inverters is that they can create problems for your power supplies. You might notice that they are buzzing, heating up, or suffering from other problems.
You generally do not have to worry if you bought a motorhome, and it came with a modified sine wave inverter. However, you should keep in mind that there is a good chance that it will fail at some point.
When this happens, you should seriously consider upgrading to a pure sine wave inverter to get the best value for your dollar.
What Are the Best Motorhome Inverters?
There are a lot of options that you can choose from when you are looking for the right inverter for your motorhome. These are some of the best ones to consider, however.
Xantrex Freedom XC 2000
Xantrex is one of the leading brands of 12v inverters for motorhomes. They have been around for years, and they have one of the best reputations of all the inverter companies in the motorhome industry.
These are quiet inverters that have a minimum draw on your battery resources. They handle continuing loads very well, but their surge ratings are lower than other brands. However, these are efficient inverters that will be reliable on all of your travels.
Xantrex inverters are more expensive than most motorhome inverter
Aims Power Inverter
Aims Power is a relatively new company, but they already have a solid reputation for their motorhome inverters. They are also one of the most affordable high end pure sine wave inverters that you are going to find.
These inverters are extremely efficient, and they are known for having a strong surge protection. This is why they have gained such a reputation for their quality so quickly. If you are looking for a good budget friendly alternative to buying a Xantrex, AIMS is going to be one of your best options.
Samlex Power Inverter
Samlex is another company that has been producing high quality motorhome inverters for a long time now. They have a great industry reputation, and you can never go wrong if you choose a motorhome inverter from them.
Samlex is definitely one of the more expensive companies that makes motorhome inverters, but you certainly get what you pay for with them. Samlex is virtually unmatched in terms of power, reliability, and durability.
If you plan to spend a lot of time travelling in your motorhome, you should consider getting a 12v inverter. This is a device that will transfer the DC power from your motorhome battery to the AC power that your electric appliances and devices need in order to run.
The size of the inverter that you need depends on the size of your motorhome battery. It also depends on how many devices you plan to power and how much power each of those devices needs.
If you get an inverter that is too small, it will not give you enough juice to meet your needs. If you get one that is too big, it will be inefficient and be too much of an energy drain on your battery.
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