Wednesday, February 28, 2024

Full Information to Motorhome Inverters


Contemplating an inverter to your motorhome or campervan? Undecided what dimension you want or which is finest? Don’t worry- right here’s all the pieces you have to learn about selecting the perfect motorhome inverter for you.

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Motorhome inverters- the fundamentals

I’ll be trustworthy, I don’t actually ‘get’ electrics. And I undoubtedly don’t get something which entails taking part in round with motorhome energy methods and batteries which might kill me if (when!) I get it flawed.

Nonetheless, ever since our very first motorhome, we’ve agreed an inverter is an important piece of equipment for the best way we use the van, so, when my final one broke (my fault!), I wanted to get a brand new one.

So, the primary query is: why?


Do you want an inverter?

Most individuals who use campsites often in all probability don’t must hassle about becoming an inverter of their motorhome or camper. In any case, the concept of it’s to vary 12v energy from the leisure battery into 230v energy which can be utilized to energy home equipment like laptops and hairdryers.

So, in case you already primarily use campsites and their energy provide, you possibly can already energy/ recharge these units.

Nevertheless, we LOVE motorhome wild tenting/ parkups. We like staying off-grid, or utilizing aires in France, or staying in forestry automotive parks.

None of those have energy obtainable, so we have to be self-sufficient. While the motorhome can survive for a number of days off-grid, units like my laptop computer (which this complete motorhome weblog was constructed on) or our drone, or our Ecoflow energy station, all want topping up to ensure that us to proceed to spend time off-grid.

We additionally tour with motorbikes, and sometimes use the inverter to recharge our helmet intercoms or our heated clothes battery packs.

For that cause, for us, it’s a van life important and permits us to be way more versatile quite than needing campsites on a regular basis. (See extra motorhoming necessities right here.)


What dimension inverter do you want in a motorhome or campervan?

Ahhhh, isn’t that the vital query!

Not like diesel engines, you don’t wish to work an inverter exhausting. You truly need there to be some wiggle room.

Nice, so simply purchase the largest one the market?

Nope- coz that’s a)- costly and b)- will drain your leisure battery tremendous quick. There must be a bit extra thought into what dimension inverter you have to match.

Inverters will not be 100% environment friendly. In actual fact, for many inverters, you possibly can count on about 80-85% effectivity. Due to this fact, to know the dimensions you want, take the biggest equipment you wish to energy from the inverter, see what it attracts (enter energy), then be sure you add at the very least 20%- that’s the dimensions inverter you want.

There are two varieties of energy you’ll see on an inverter- steady energy output and peak energy output.

Peak energy is short-duration, normally on start-up. Steady is… steady. That is the quantity you have to have a look at whenever you’re choosing one to buy.

My first inverter was 300w. As you possibly can see within the video, it wasn’t sufficiently big to do what I wanted it to do. The brand new one is 2000w!

That is the one we simply fitted:


Pure sine or modified sine?

Okay, in case you perceive electrics look away now, as a result of that is in all probability extra fundamental you then need it to be.

A pure sine wave offers a clean voltage curve, which is what most home equipment are designed to run on. A modified sine wave has ‘steps’ the place the ability will increase or decreases in jumps. These jumps in voltage could cause issues with delicate electrics, like laptops, TVs, espresso makers, energy stations and CPAP machines. It may additionally trigger overheating of transformers and chargers.

Nevertheless, they’re usually fantastic to energy issues like hairdryers, energy drills, battery packs and many others.

As a result of they’re not as refined, modified sine wave inverters are MUCH cheaper to purchase than pure sine.

NOTE: When you’re shopping for off Amazon or on-line, many abroad locations state their system is pure-sine when it’s not. Do your analysis fastidiously. You may see the one we obtained within the Youtube hyperlink above.


Becoming an inverter in a motorhome

Right here’s how we fitted our new inverter in our motorhome. It wasn’t too troublesome BUT, in case you’re in any method uncertain, please ask an expert to assist so that you don’t damage your self or injury your methods.

Ideas for becoming a motorhome inverter

Listed below are some suggestions that will help you:

  • Don’t let something contact the battery terminals collectively
  • Inverters are essentially the most current-heavy objects you possibly can connect to a 12V battery. Use numerous fuses as security breakers.
  • Fashionable battery cables have the continual present score marked on them – ensure your fuse by no means exceeds these score.
  • Ensure the wires/ leads are the proper gauge. Some inverters are equipped with cheaper leads which aren’t robust sufficient to do the job.
  • Some small inverters might be powered from a 12V cigarette socket. DON’T plug thes into the socket within the cab as that’s powered by your car battery and can drain it. Solely use it from sockets within the hab space that are powered out of your leisure battery.
  • Keep in mind that simply because it may be powered by a cigarette lighter, doesn’t imply the cigarette lighter in your van is robust sufficient to energy it; a 120W inverter can draw round 10A, which can seemingly blow a cigarette-lighter fuse at full energy.
  • Attempt to place the inverter as near the leisure battery as doable to maintain the cables quick (max 2m for any inverter over 2000w). This reduces the temperature and voltage drop within the cables.
  • If this isn’t doable, enhance the diameter of the cables.

Learn how to use a motorhome inverter

The best method to make use of a motorhome inverter is to plug your system or equipment straight into the 230v 3-pin plug socket truly on the inverter.

Alternatively, you need to use an extension result in make it simpler to entry, however don’t overload the inverter with an excessive amount of.

It’s actually sophisticated to get an inverter to run the prevailing 3-pin sockets within the habitation space of your motorhome, so attempt to keep away from pondering of it like that.

We ONLY use our inverter while we’re driving. This enables us to cost units prepared to be used after we cease AND stops us from by accident draining the leisure battery. We additionally by no means use it for longer than an hour and it’s not often operating at something near full energy.


How lengthy will an inverter run off a motorhome battery?

Like all the pieces else, this may depend upon the dimensions of the inverter, the dimensions of your motorhome leisure battery/ batteries and the dimensions of the system(s) you might be powering.

Nevertheless, to offer you an concept, a 2000w inverter (just like the one we put in), operating at FULL POWER (which is unlikely for a protracted interval), may flatten a 100A motorhome leisure battery in 36 minutes.

Right here’s the maths:

  • 2000w/ 12v= 166.6 amps/ hour
  • 100amp battery/ 166.6= 0.6 hours (36 minutes)

BUT- you don’t wish to flatten your battery, so in actuality you solely have about 18 minutes of full-power use earlier than you have to cease. That is one more reason we solely use the inverter while driving AND solely after we’ve been driving some time, so the battery has had time to get at the very least a bit of bit recharged.


In the best way WE use the motorhome, an inverter is crucial. But it surely’s not for everybody. Earlier than you lay out on one, be sure you suppose it’s one thing you’ll undoubtedly want.

Need extra suggestions for motorhome life?

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