Solar Energy Calculator for 'Grid Tied'
Billing & Crediting
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 diagram.

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Click for:   'Grid Tied' Overview
Grid Tied diagram    Net Metering 101    Straight Talk    Solar Zone Map
 8 key factors that guide your system  (Enter with Tab key, Enter key, or Touch)
Current billing Monthly: kWhr  @  $/kWhr =  $/Month
Hrs of Daily Sun in  × W panels.  Solar Credit @ $/kWhr
Panel Life Years   Net Metering App. fee $    Fed. Tax Credit: –%
Add in one-time costs here and discounts here  
  Select a system  
Without Battery 
With Battery 
System Cost: $         $ Profit after year payback
Simple ROI =            Annual ROI =
 Enter up to 5 systems for comparison  

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Visit Evergreen Solar ... National Council for Solar Growth
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