This thread has become very much a resource for the PowerJack inverters and is so comprehensive that it's intriguing that no-one's added to it.
That photo of the 6kW PJ unit with the AS2 transformer is exactly what has been going wrong at PowerJack and possibly increasingly for a long time.
I've got a 5kW unit with the same transformer. :-) And that transformer is fit for only 2kW continuous with 3kW for intermittent use.
PJ developed what looked like a superb 15000 unit beyond their old unit with three transformers. The three transformer unit was good and delivered 6kW happily. The new 15000 unit had double sets of power boards and one big transformer. This could deliver the goods, probably 8kw at least.
I bought two, one to sell and one to keep and use myself.
The new units were heavy beasts and were inadequately packaged, so one was damaged in transit. Cher very kindly sent me replacements of the damaged connectors etc.
Through ebay someone bought one of the units and he came to collect it, to send to his house in Africa.
I demonstrated and tested the unit, and at 2kW the inverter failed with LEDs on the power boards starting flashing. We switched to the other unit which was fine. It went to Africa and served well. Until, that is, someone connected the output of a generator without a proper changeover switch so that the generator and inverter output were connected together. They bought new parts through Cher and fitted them and the inverter worked unreliably and did odd things.
Meanwhile Cher sent me replacement electronics to fit into my unit which had failed at 2kW. It was a lot of work to fit all the mosfet boards and some screws were impossibly tight. When finished, on test the inverter failed again at 2kW. I assume there's a dodgy winding insulation in the transformer.
Cher was highly embarrassed. PJ themselves were their usual selves for which they have earned a reputation, and after a couple of months Cher has left PJ.
Meanwhile on my own installation I have a 200m cable between the battery installation and the house. A junction box had become damaged allowing ingress of water, causing insulation to break down. I had intermittent brown outs which recovered and should have investigated but didn't. Eventually the cable end caught fire in the junction box (outside so not dangerous) and shorted, and this blew the electronics of my 8000LF to which I'd added an extra transformer. Luckily I had a spare set which I have nearly finished fitting.
However this caused me to enquire of another contact of PJ who told me that the 8000LF 24V version wasn't in production and they were only making "4000" units at the moment. I told them that this was regrettable and the lady said that they would be reconsidering restarting production of the 8000LF.
However, there is another company making inverters with sound ethics, that specifies their inverters correctly, Solinba. I have one of their 24V 3000W units on test at the moment and it's flawless. A lady by the name of Lily with the company is very helpful and I'm trying to encourage her to get the company to build a 6-7kW unit.
As a matter of interest she told me that her company uses copper transformers but PJ had turned to aluminium transformer windings. It's for this reason that although there is an Amazon stock remaining of the PJ 8000LF units, I'd wait until seeing what Solinba might come up with.
Best wishes
OTW