We've used pressure cookers for decades, but don't have one on the boat just now. Would be welcome, I just haven't addressed the storage issue yet.
In fact, our last old-style PC crapped out, and we've only very recently gotten a 6-qt electric Instant Pot as the replacement. Generally very pleased, although it comes with some size issues given the built-in heating element and given the shape/design of the lid. I reckon to take the 6-qt model to the boat for a storage test, and if there's any way, maybe we'll get the 5-qt model to keep onboard. There's only very little difference in height between the two, though.
Hadn't thought about being able to power the thing with the inverter... Might become a useful feature.
-Chris