how does a photovoltaic system that feeds back into the power grid get on the same phase angle? Or?

Question

should i say does it need to be the same as the poco's?

Answer 1

That's what the inverter takes care of. It synchronizes the phase directly with the mains phase.

Answer 2

PhotoV's generate DC. You need an inverter to convert that to AC and the inverter's phase is determined by the main you are putting to.

If you could generate AC 180D out of phase, you could put that right in front of your electric meter and get ALL your electricity for free.

Don't do that, by the way, or you will get arrested...