If an RV washer works normally on shore power and generator power but shuts off during an inverter-powered cycle, the issue may not be a lack of inverter capacity.
What happened in this installation
During a recent Big Beard Battery build, a newer Splendide washer would start and then shut down mid-cycle on inverter power. It operated normally from shore power, confirming that the appliance could run and the system had enough capacity.
The interaction behind the shutdown
The washer used a TRIAC-controlled motor. When the drum changed direction, electrical feedback returned to the line. Shore power or generator power absorbed that behavior without a shutdown, but this inverter-based installation—also involving an autoformer—reacted differently. The washer interpreted the response as a fault.
This was an interaction between the appliance electronics and the power system, not proof that every washer or inverter installation will behave the same way.
The solution used
A 2,000 VA isolation transformer was installed on the washer's individual circuit. The washer required approximately 1,500 watts. Configured for 120V input and 120V output, the transformer electrically separated the circuit and helped absorb the feedback. The washer then completed its cycle on inverter power.
Isolation transformer versus autoformer
An autoformer and an isolation transformer serve different purposes. An autoformer is commonly used to manage voltage in a broader system. An isolation transformer provides galvanic separation between its input and output and, in this case, stabilized one appliance circuit.
When this may apply
Consider this possibility when the washer works on shore and generator power, shuts down only on inverter power, and the inverter and battery system are correctly sized. Diagnosis and transformer selection should be performed by a qualified technician; incorrect AC wiring can create shock, fire, or equipment hazards.
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