Transformless inverter

[marky.fitz]

Hello please bear with me I'm not an Electrician but havea question which I hope someone can answer or point me in the right direction.

A friend has a PV system installed on their garage roof with a transformlessinverter located in the garage and fuse board in garage for PV system.

An Electrician who he's asked to look at the original installation (which wasinstalled by someone else) say's that he is measuring 177 DC volts going backfrom the inverter to AC sub-main when isolators are closed but not with isolatorswitched off (but still getting 177 DC volts from inverter to AC isolator). Isthis high reading normal for a transformless inverter? I know it doesn't havegalvanic isolation but figure seems high.

Is there any documentation anyone can suggest regarding transformlessinverters?

Thanks in advance of any help.

 

[SpitfireW'sale]

The value 177V DC on the AC side does not make sense. where did he measure this value 177V DC? phase to neutral? As long as it's a G83/G59 inverter type verified, the maximum DC injection into the AC side is up to 20mA.

Is there any RCD installed in the Consumer unit? if yes it would be tripped already.

Double check the tester as well. it may need calibration.