Options to convert existing grounded system to use transformer-less inverter?

[MichKrom]

Hi,

My system is an older SunPower installation with positive-ground PV panels. One of the inverters (SPR-3300) failed and I need to replace it (the battle is described here). It seems that the inverters on the market are all transformer-less (TL) these days. What are my options?

This seems to suggest the conversion may be possible?

https://www.renvu.com/Learn/Upgrading-existing-grounded-inverter-systems

Any suggestions?

Regards,
Michal