12V INVERTER FOR CAMPER VANS- Inverter for the mobile home, which one should you buy? A 230V power supply can do no harm in a self-sufficient mobile home. Since I installed the lithium-ion RV battery, I have used even more 230V from the inverter. For years I have relied on reliable technology from Renogy Energy. The MultiPlus is a great inverter with an integrated charger and covers all my needs.

I have been using the Renogy Multiplus inverter with an integrated charger (12/2500/120) for a long time. It’s so old that it’s no longer built. But it still works perfectly. Since Renogy Energy is also constantly developing the inverters and integrating new functions into them inverters, I would like to be able to use them and, above all, gain experience with them. I was lucky and could convince my supplier of a deal and got the current Renogy MultiPlus 12/3000/120-50 in exchange for my old Multiplus inverter.

The Renogy Phoenix series is the Mercedes of inverters, with the small difference that the Renogy inverters do not break down as often as a Mercedes. In general, inverters are considered unbeatable. Even after 10 years and more, they still run without problems. My previous Phoenix inverter is already 15 years old and does its job without complaint.

What made the Phoenix inverter so unique? 12V INVERTER FOR CAMPER VANS

The following features speak for the inverters

  • Pure sine wave voltage: With the Renogy inverter, all devices can be connected without hesitation. There is no modified sinusoidal or trapezoidal voltage like some other devices in the low price range.

⦁ Integrated charger: Depending on the inverter’s power, the integrated charger has a charging capacity of 35-120A. The charging current and charging characteristic can be easily adjusted via software.

⦁ Capable of overloading and protective circuits: Overtemperature and overload do not bother the Multiples. It reliably switches itself off or reduces the power if the device gets too hot.

⦁ Energy-saving: An energy-saving mode allows the inverter to be left on at all times. If no load is switched on, it goes into search mode and briefly checks whether a consumer is connected every second. If there is no consumption, it switches itself off again. In this mode, the 3000w power inverter needs 0.3A per hour (4W). If the inverter is permanently switched on (without AES), the self-consumption is 2.5A (32W).

⦁ Easy to control: The inverter’s input current can be limited using the remote control, which should be purchased. So if you are connected to shore power, and the socket on the campsite only gives 4A, you can set the inverter to 4A. Up to 4A, the current from outside is now used. If you need more power in the mobile home, the inverter gets the missing power from the onboard batteries. This means that maximum power from the inverter is always available in the mobile home.

⦁ Available versions: The models are also available in 24V and 48V and up to 5000 watts, which is rarely found in motorhomes.

Installation of the inverter in my mobile home:12V INVERTER FOR CAMPER VANS

The old Multi 12/2500/120 is thrown out. As already written above, I want to gain more experience with the current devices. The software has changed significantly over the years, which can have different effects in practice. In addition, the new one comes with an energy-saving function, which I’m keen on. In some cases, it makes sense to leave the inverter overnight without draining my batteries with 40W. However, this function also has its pitfalls, which I will discuss below.

Since the new MultiPlus inverter/charger has a continuous output of 3KW, it was time to strengthen the cables again. I rarely need more than 1800W, and the battery management system of the LiFePo4 battery can only cope with a maximum of 2.5KW, but you never know. That’s why it’s better to do it right. In addition to the already lying 36mm², I have packed an additional 50mm².

After everything was connected and the first function test went without a cloud of smoke, I plugged in the laptop and set the battery charge characteristics. I also activated the energy-saving mode, and now the 3KW inverter only needs 0.3A at 13.5V on standby—the low power consumption results from a search mode. The inverter checks every 2 seconds whether a load greater than 37 W is required. If so, it stays on and only switches off again below a minimum load of 25W.

The thing about the power saving mode:

Great for coffee machines, spin dryers, fan heaters, etc., but unfortunately still not usable for my printer. It needs less than 25W to boot up. That’s why the closet finally got old-fashioned lighting, with a 40W 230V light bulb. With a switch, the printer and the lamp are switched on simultaneously, so the WR recognizes a sufficiently high load and stays on. The search mode can also be switched off, and the WR always provides full power, as usual.

For the short period in which printing is being carried out, the 40W of the lamp does not interfere. The printer itself is happy to use 1.5Kw when heating up.

Further possibilities with the inverter:

With the new Multiplus, the foundation for the VE. The bus system has now been laid. The VE. Bus BMS allows a full 5KW load with the small relays. This becomes interesting when you say you want to use the battery and the off-grid solar system of the vehicle for self-consumption in a house. Why should the Womo stand in front of the house with full batteries?


Or another idea: you have a small house, without electricity, in the middle of nowhere. If you are at the home with the camper, you plug the “the house” into the inverter in the camper and have electricity in the hut. If the sun is not shining, the Multi can automatically start a generator, which recharges the battery. You can, of course, set how much the battery is recharged.

So it will continue soon, but I have to clear out half the Womo and pull in a lot of new cables, and to be honest, I still need more desire and time.


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