Also called Net Metering,
is a practical way to utilize residential Solar power without needing a battery.
A battery is nonessential but may be added to cover grid power failure during a no Sunshine period, such as for emergency.
Extra Solar power is sent TO the grid, and when no Sunshine, you get FROM that grid the power you need.
Power may travel and is metered in either direction, and usually at end of year, you are credited by their kWhr credit rate for any extra Solar power.
This has two kWhr rates, each depending upon your utility provider;
1) utility electric bill kWhr rate, and
2) Solar Credit kWhr rate
The Solar Credit
as shown is most often less per kWhr than your monthly bill kWhr.
Therefore both rates are required for calculating Solar payback period and its ROI.
This Credit usually does not include supplier expenses such as shipping, handling, maintenance, taxes, etc.
If the electric company does include those items, they must report such as their expense, which may be taxable to the resident.
They can often vary and may be delayed for months past a resident's need, often credited at end of year.
See Grid Tied
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