I manage to get these working in series and works fine.
Simply
1. Take bonnet away
2. release mains connector from case and unscrew GND.
3. separate internals (open corner screws)
4. put it to table as bottom up, connector strip towards you.
5. locate small 8 pin connector at left side (topside near fans)
6. solder jumper between pin1 (deep purple) and pin4 (tan) (these are pson / pskill so pins 31+34
7. solder jumper from pin5 (light brown) and +12V (left side long connector strip) (pin 30 to +12V)
To make 25V 2000W 82A (240V) system
Prepare another power supply to same stage.
Mark one to 12V and second 24V
Now we should have two 12V power supplies ready.
Take DC ground out from 24V power supply, by removing copper layer from power strip end both sides (from bottom left and right and top left and right)
verify that yo dont have connectivity to mains ground from power strip long middle strip. Be carefully when removing copper as PCB has copper in 3 layers.
If You managed to make 24V PS as DC isolated concratulations, time to put internals back to cases.
Now put 12V case to table as botton up and 24V case to top of 12V case as top up and line cases parallel. (power strips towards You.
Tape power supplies together with glass fiber reinforced tape.
Drill 3.5mm hole to long left top power strip so that it goes through lower long left power strip. (this is going to be the parallel bridge between power supplies)
I used leftover hexagon from HP DPS 600GB that is located in +12V and GND.
Then prepare power connectors from 4mm bullet tube to be soldered in 12V gnd side long power strip on the bottom right (prepare these bullet tubes by dremeling 1.5mm wide in middle of solder end) put these bullet tubes proper place and solder them.
Put heat shrink insulator over bullet tubes and shrink with heat gun.
Cover power strips with pvc heat shrink (120mm wide) 15mm long piece.
Cover whole PS case with pvc heat shrink (200mm wide) length of Power supply is 215mm, so cut 230mm long piece.
Pull cover over and position it so that both ends have same amount over the case.
Start heating from the ends, keep heat gun around 200mm away of pvc covering, as it's easy too screw it up by too high heat and keeping heat gun too close.
Now You have nice and neat 25V 2000w 82A power supply ready for feeding all Your charging needs
Only minor negative thing is that sourcing these power supplies can be pretty expensive in ebay or another places.