My area doesn't have hard rubbish collection, but I still managed to get things this past month.
First thing I got was a Sunny Roo 5000, 5000w Solar Inverter.
Apparently dead, but so far I've not found faults. General thoughts are it's just got some minor design issues related to software/monitoring and throws errors/disconnects easily. Also smells of cheap crappy caps after my last test where I fed 375V DC into the solar PV inputs.
Being a grid interactive inverter, I really need a fake grid to connect it to, or a better output stage.
Then I got a second bigger inverter.
MGE Comet S31 20Kva UPS
Active power: 16Kw
Input: 3 phase 415V AC
Battery voltage: 288V DC nominal
Output: single phase 240V AC
Net weight without battery: 210 Kg
The solar inverter is 28Kg and wall mountable, the huge UPS is fridge sized and probably heavier than a dumpster.
Neither have anything more than a very basic block diagram, so I'm making my own. At a basic level both have a Boost Inverter and an output inverter, the only transformers are tiny ones confined to the LV supplies to the electronics.
UPS teardown, testing, etc is up to day 4 now.