Solar inverter output protection breaker

Question

I have a solar inverter. Previously I would just assume the line and pull it through required single phase breakers in the distribution box.
But I have noticed that both lines have voltage to ground. I.E. even though the consumer doesn't work when you switch the breaker off the voltage from the "neutral" is still there.
I have tried switching the neutral and line but it has the same result. Should the inverter supplied consumers have breakers that cut both line and neutral?

Answer 1

If two things are electrically isolated from each other, the voltage between them is ???. Cheap DVMs are extremely high-impedance (hi-Z) and will report nonsense numbers between two disconnected things. This is not a concern, it's just "phantom voltage".

A Grid-Tie system should be isolated

First, if this is a grid tied system, the inverter should comply with UL 1741 aka IEC 62109 rules for grid following, and totally shut down and isolate when it is not connected to an electrical grid. This is mandatory and normal behavior.

As far as whether circuit breakers connecting solar disconnect the neutral, that varies among countries. Europe has been starting to require breakers disconnect neutral along with live. This makes sense, since they have "whole house" RCDs (weak GFCIs). A branch circuit with a neutral-earth fault would disable the entire house's electrical system, and if breakers only switched live, there'd be no way to isolate that circuit to get the power back on.