RV Washer Shuts Off on Inverter Power? How an Isolation Transformer Could Help:
- Anthony Flammia
- 5 days ago
- 3 min read
If your RV washer runs fine on shore power and generator power, but suddenly shuts off mid-cycle when you're on inverter power, you're probably dealing with more than just a simple power issue.
We ran into this exact problem on a recent solar build at Big Beard Battery in Athens, Texas. The RV had a newer Splendide washer, and everything seemed normal at first. It would start up, begin the cycle, and then just shut off while running on inverter power. But when plugged into shore power, it worked fine.
That told us something important right away: the washer itself was not broken, and the system did have enough power to run it. Something else was going on.
What Was Causing It?
After working through the issue, we found the problem came down to the washer’s newer TRIAC motor design.
Without getting too deep into the weeds, these newer washers can send a strong electrical spike back into the line whenever the drum changes direction. On shore power or a generator, that feedback usually gets absorbed without much drama. But on inverter power, especially in a Victron-based system with an autoformer in the mix, it can behave differently.
Instead of that feedback being absorbed the way it normally would, the motor can see that response as a fault and shut itself down mid-cycle.
So the problem was not that the inverter could not run the washer. The problem was how the washer and the inverter system were interacting with each other.
The Fix: An Isolation Transformer
The solution was to install an isolation transformer on the washer’s individual circuit.
That transformer helps absorb the electrical feedback and separates the input and output electrically, which gives that washer a much more stable environment to run in. In this case, we used a 2000 VA isolation transformer, since the washer only needed about 1,500 watts, and it solved the problem.
Once that was installed and set up correctly for 120V in and 120V out, the washer ran like it should on inverter power.
Isolation Transformer vs Autoformer
An autoformer and an isolation transformer are not the same thing.
An autoformer is typically used to help manage voltage across a broader system. An isolation transformer, on the other hand, is used to protect and stabilize a specific circuit. In this case, it was exactly what the washer needed.
When This Might Apply to You
If your RV washer:
works on shore power
works on generator
but shuts off on inverter
and you know your system is sized correctly, there is a good chance you may be dealing with this kind of issue.
It is one of those problems that can be frustrating because everything looks like it should work. You have enough battery. You have inverter capacity. The appliance starts up. But then it fails anyway.
That is what makes this kind of issue tricky. It is not always about how much power you have. Sometimes it is about how that power behaves.
Final Thoughts
As RV appliances keep getting more advanced, we are seeing more situations like this where the issue is not obvious at first glance. Newer electronics, newer motor controls, and more complex inverter setups can create quirks that are easy to miss if you have not run into them before.
If your washer is shutting off on inverter power, an isolation transformer may be the missing piece.
And if you're planning an RV solar system or trying to troubleshoot one that is not behaving the way it should, we’d be glad to help.
Get a free custom solar design from Big Beard Battery here:https://www.bigbeardbattery.com/solar-design
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