[RE-wrenches] How to find Ground fault on ungrounded system.

[Jerry Shafer]

Darrel
I have the same issue with the same inverter, my issue is intermittant and
it does appear to be in the array, l have done the test to earth, megger
tester, PVA-600, My issue may not appear for weeks and my thought is
modules leaking when it gets wet enough. I suggest testing with a wet
array, l have had sucess with megger testing and leaking connectors or
splices that way.
Jerry

On Fri, Aug 17, 2018, 10:41 PM Darryl Thayer <darylsolar1 at gmail.com> wrote:

> The system is Fronius Primo, trip on fault code meaning ground fault in
> the array.    I disconnect the arrays from the combiner it measures  400+
> corresponding to Voc
> @ temp.  My Fluke multimeter the same about 5 volts to ground off both
> ends of the disconnected array.  When I connect the inverter and set into
> operation I measure a difference of voltage to ground.   The tech support
> at Fronius says it can't be the inverter.  Is the problem in the array?  Or
> the inverter?
>
> If I meg the array, my procedure is to open circuit the array and connect
> my negative lead to ground and my positive lead of the Megger. to the
> negative lead of the array.  please comment on my megging practice.
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