Also called Net Metering,
is the most practical way to utilize
residential Solar power. A battery is nonessential but may be added to cover grid power failure during a no Sunshine period.
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 power.
This comparison has two kWhr rates, the amount of both depend upon your utility provider;
1) utility electric bill kWhr rate, and
2) Solar credit kWhr rate
Solar Utility Credit is less per kWhr than your monthly bill kWhr.
Both rates are required for calculating Solar payback period and its ROI.
Crediting Solar with Retail is in debate today. Retail includes supplier expenses, taxes, shipping, and misc. fees beyond
Additionally, those retail line items will require the Solar energy supplier to eventually report such credit as 'business' income, e.g. services, taxes and fees, etc.
See Grid Tied diagram.
Click to Exit