Solar charge controllers with a dc lead grounded.

[evad]

Looking at the epever solar charge controllers some have the negative lead grounded. What is the reason for this and why does it seem to apply only to the smaller units.

 

[Roswell Bob]

Looking at the epever solar charge controllers some have the negative lead grounded. What is the reason for this and why does it seem to apply only to the smaller units.

Got a link to documentation?

 

[evad]

EPEVER an series

 

[PVorBust]

I've got a few of the AN series and the ground screw on the heatsink is isolated from the negative connections.
I assume it's for RFI