Midnight took their time before releasing Rosie. You can be sure it is robust and performs well before they do. Midnight was running them in-house, inviting people in to test them, and I think sending to beta testers (but I haven't heard details from beta.)
Each type has their own advantages, high frequency inverters are smaller, lighter and more efficient generally but when driving hugely inductive loads such as a induction run deep well pump the start surge will stall a poorly designed high frequency inverter and what is not widely known is when...
diysolarforum.com
What I noted was that their demo of simultaneously starting 4x air compressors was that those were brush-type. They also power one deep-well pump in a bucket of water, but we need to know motor specs and it should be loaded with backpressure.
Ideally, they or somebody would sequence through a series of induction motors, reporting which start easily and which don't start.
Each type has their own advantages, high frequency inverters are smaller, lighter and more efficient generally but when driving hugely inductive loads such as a induction run deep well pump the start surge will stall a poorly designed high frequency inverter and what is not widely known is when...
diysolarforum.com
"Rosie pulled 467 Amps from the batteries at 43.56 volts. That's 20,342 watts on the DC side. She held that load for 10-15 seconds before shutting down! Wow!"