I find much of the run around to be rather self-inflicted due insufficient information other than he has a mix and match of cheap and overrated/overworked devices and what comes off as rather poor choices in the overall approach to the realistic problems at hand.
This is supposedly a near do or die situation yet it's been dragging on for weeks now plus several realistic and fairly easy to implement solutions to the pump driving situation have been given yet none have been shown any real interest.
Also things like his sine wave inverter burnt out and we have yet to get a single comment on what brand and model it was and what actually burned up,
or how the overall system is designed other than it has no battery bank which is an absolute must for highly fluctuating loads like overloaded induction motors cycling on and of at random, in the unit which to me if I had a working inverter that burned out that would be my #1 priority to determine what burned up and why and if possible repair and reconfigure the unit to work better.
My guess is simple overheating and long term overloading was the basis of the problem which if so is not that difficult problem to fix.
That and he has the system running directly off the solar panels with no battery stabilization (says so over his AAC thread) to keep the DC side supply voltages stable during fluctuations in the solar panels output and the pumps start-run cycles as they overheat and shut down then reset which to me strongly suggests the inverters were being regularly subjected to wide ranges of input voltage dips and spikes when the pump motors would cyle on and off which is a pretty effective way to kill their switching devices.
Lastly, he says he is running his 500 watt rated pumps at ~800 plus watt loads until they overheat and shut themselves off which to me say that they are likely units designed for deeper well higher lift applications than they are being used in and likely need some basic flow restriction to reduce their flow rates and related power draw down into their designed working range.
My take on this whole fiasco is that most of the major problems like the inverter burn down and the pump overloading could have been avoided had a pair of 12-volt 50+ Ah deep cycle batteries been in place on the 24 VDC supply and a simple valve to restrict the pumps flow rates down to where they are not running in an overloaded high flow state been used which could have been easily figured out had the inverters manual and the pumps specs sheets been read and taken into account at the initial setup of the system.
That's my thoughts on this.