Ground Fault Detection Interrupter (GFDI)

[Ibis Designs]

Some inverters are provided with GFDI and some are not. Is this a regulatory thing dependent upon the country of use intended for the product?

 

[Gavin A]

transformerless inverters need it, galvanically isolated inverters don't because they're protected by virtue of the DC being galvanically isolated from earth.

 

[Ibis Designs]

Thank you Gavin. I had no idea transformer-less inverters existed. Not sure I would like to use one.

Brian

 

[Gavin A]

Thank you Gavin. I had no idea transformer-less inverters existed. Not sure I would like to use one.

Brian

most string inverters are transformerless now, they're more efficient

 

[meeb]

Hi Gavin

Do you have an example of such an inverter? I always thought that a GFDI must have a permanently grounded pole (Pos or neg) on the DC, where is Riso monitoring (like in SMA centrals) use a Bender relay, using PE as a reference point.

Thanks

Meeb

 

[Deleted member 26818]

ABB TRIO Solar inverters are transformerless.

 

[meeb]

Sorry was looking for an example of a string inverter which uses a GFDI. TL inverters are everywhere

 

[Gavin A]

galv isoltated inverters would be stuff like the old SMA sunnyboy SB series, but also NEDAP's power Router hybrid battery inverter is galv isolated.