Solar system design: Inverter keep tripping problem
A pressure washer has a high crest factor for current meaning the current is not sinusoidal and pk/RMS is not 1.414 but could be &gt; 3:1 sustained and not just on startup.  i.e. &gt; 6kW peak power sustained but 2kW average.
(If so) This, in turn, causes I^2 *R  losses that exceed the peak power capacity and result in excessive self-heating slowly then inductor saturation which in turn causes thermal runaway and shutdown.