EcoRenovator - View Single Post - Off-the-grid with grid-tie inverter?

Xringer · 03-16-10, 11:10 PM

If you have a few Enphase GTI AC outputs tied together in parallel,
what keeps them from destroying each other?

I do see what you mean with the excessive PV power.
The GTI will want to dump that PV power to the grid (or your fake grid), in the largest quantity it can..

Just thinking about it, it seems you would need your load,
be large enough to use all the power from the PV array
and a little bit of power out of the battery..?.

I think the Enphase monitors the AC line in small time slices and then
puts it's own replica AC on the line during it's output cycle.
That cloned AC from the Enphase is slightly boosted in amplitude,
to push power onto the grid.

The nice thing about resistive loads and some motor loads is,
when the voltage does up, the load draws more current (uses more power).
I=E/R

I guess my oddball configuration working is going to be very dependent
on the functionality of the GTI.. Those cheap Chinese GTIs might not
would with this kinda of scheme.

03-16-10, 11:10 PM	#15
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	If you have a few Enphase GTI AC outputs tied together in parallel, what keeps them from destroying each other? I do see what you mean with the excessive PV power. The GTI will want to dump that PV power to the grid (or your fake grid), in the largest quantity it can.. Just thinking about it, it seems you would need your load, be large enough to use all the power from the PV array and a little bit of power out of the battery..?. I think the Enphase monitors the AC line in small time slices and then puts it's own replica AC on the line during it's output cycle. That cloned AC from the Enphase is slightly boosted in amplitude, to push power onto the grid. The nice thing about resistive loads and some motor loads is, when the voltage does up, the load draws more current (uses more power). I=E/R I guess my oddball configuration working is going to be very dependent on the functionality of the GTI.. Those cheap Chinese GTIs might not would with this kinda of scheme.