Summary

Printable parts for improving cooling system of hybrid inverter

Two lower fans are blowing fresh air into case, while upper-side ones - blowing heated air out.

1. Buy better fans,i used Arctic P8 PWM PST CO 80 mm Black (ACFAN00151A)
2. print all parts from this page
3. unscrew the front panel and remove installed fans, disconnect them from pcb
4. Solder everything needed, or replace pins in connectors cases
5. attach upper fans to their mounting frames (which you printed)
6. cut dust filter material to fit into printed parts (for lower fans)
7. attach lower fans onto inverter case, put screws through printed parts, screw them
8. connect and assemble everything as it shopuld be

Now your inverter runs much more silently)