New Installation - Australia, Regional NSW

[wattmatters]

@craigcurtin

@Watts - what happens when you go ongrid though - those 3 phase cables will be phase angle seperated then and all of your resulting measurements will be out of whack i think ?

That’s only a rare occurrence, e.g. if I need to take the off-grid system offline for maintenance or something like that.

In any case the RED and WHITE VTs will still be on their respective phase and be unaffected.

@craigcurtin

Also where is the phase control for the offgrid setup being generated ? Is it passed through the AC in port by the Offgrid inverter or is it generating its own phase timing (which is what i think it would be doing)

If so - wouldn’t that phase not naturally (unless very very lucky) be aligned with the actual real grid phase ?

It depends.

If the off-grid system is in grid-pass through (Utility First) mode, then the grid supplies the phase timing. The power is a straight pass through.

If the off-grid system is not operating in grid-pass through mode, then the off-grid system is supplying the phase timing.

Which is why the BLUE phase VT is supplied power from the output of the off-grid inverter - so that the phase timing it supplies is in alignment with whatever the source of the power is, be it a grid pass through or generated by the off-grid inverter.

This is why I went with individual VTs.

So if I did need to flip the transfer switch back to grid-only (e.g. for off-grid maintenance), then in that time, I can either simply change the VT settings for those circuits back to their original phase, or not be fussed with having incorrect data if the downtime is short.