YASKAWA PVI 23 TL Installation And Operation Manual page 9

PVI 23TL, 28TL Installation and Operation Manual (Rev J)
Feeding power back to the grid involves the conversion of DC voltage from the PV array to grid
compatible AC voltage by inverting DC to AC. This unit feeds power into a standard, three-phase
commercial, industrial, institutional, or electrical utility facility's electrical system which is
connected to the electrical grid.
If the PV system and inverter are providing the same amount of electrical power that the facility
is using, then no power is taken from or fed into the utility grid. If the facility is using more power
than the PV system is providing, then the utility grid provides the balance of power. If the facility
is using less power than the PV system is generating, then the excess is fed into the utility grid.
Be sure to follow local regulations regarding net metering and interconnection in your local area.
Note that some utilities need to change their kWh meter for proper net metering measurement
and billing.
Photovoltaic
Array
DOCR-070365-J
Figure 1.1 – Grid-Tied Inverter Application
PVI 23TL
PVI 28TL
Inverter
Electrical
Grid
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