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Monday, 20 April 2018 08:88

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SA Power Outage in 2016

100KW Solar Farm Investment Time-frame.

There is a 100KW MAXIMUM limit to Claim STC Credits.


  1. Flat & Fixed Tilted Solar Panel Racking is the least efficient at Harvesting Energy.
  2. DAT & SAT Solar Tracking Racking is the BEST at Harvesting Energy.

Change the Panel Watts, Array Racking and Latitude Location for better accuracy of this calculator!

This calculator does not allow for inverter, transition or parasitic losses.

NB: Only the RED cells can be changed, currently set for a 100KW Solar Farm.

 :: Energy HARVESTING potential ::

Enter Solar Panel Quantity:


 Add additional panels to compensate, if you have Wind/Aqua generation installed.
Solar Panel Power:
 Solar Racking & Harvesting:

 For accurate calculation, solar modules effected by Shading from trees, buildings or terrain, reduce the hours of Harvesting! 

 Total Energy Harvested:

kWh DC energy Harvested per Day. 

 Solar Array Size 

per Hour/peak

 Energy Harvested 

per Day/peak

 Energy Harvested 

per Week/peak

 Energy Harvested 

per Month/peak

 Energy Harvested 

per Quarter/peak

 Energy Harvested 

per Year/peak

 Above Fields indicate approx. Energy production, other factors can change these results. 

 :: Australian Commercial RETAIL Energy Rate ::

 Enter your current Retail Energy Rate: 

$ per kWh 

NB: December 2019 commercial energy rates;

  • $0.24 kWh for Peak energy rate.
  • $0.28 kWh for Shoulder energy rate.
  • $0.15 kWh for Off-peak energy rate.

 Change the above Energy Price, to your local Energy rate.

 :: Small-scale Technology Certificates (STC) ::

 Calculate REC Credit using Green Bank REC ($) Calculator OR The Government STC Calculator  

 NB: STC are limited to maximum 100kWh system.

 Number of years REC's are Claimed: 

 Max 11 Years(set to end in 2030) 

*Small-scale Technology Certificates (STC): 

 STC Credits. 

  (1 STC = 1 REC)  

 *Renewal Energy Certificate (REC) Price: 

$ per REC.  

  TOTAL System REC's Refund/Credit: $

 Change the STC Credit Price above to the current offer Market rates.

 LGC Rate is set to reduce to $23.60MWh in 2020, and $14.25MWh for 2021.


 per Hour


per Day


per Week


per Month


per Year

$ $




 :: Micro Power Grid - Potential Payback time ::

 Enter TOTAL System Investment Cost: 

$ This can include Solar, Wind & Batteries etc.

Approx. Yearly Savings/Income: 

$ If consumption of all Solar energy at above Energy Rate.

*Approx. Yearly REC: 

$ 1 STC =1 REC at above rate (REC are commonly claimed by the solar Retailer).

Years to Break-Even Period: 

 Years  Based on figures entered above.

Solar Farm Capital Expense: 

$ per Watt  Based on Total system cost ÷ by system kWh.

 Change any of the above RED Fields to see the Investment Payback Time!


Important: Please note that all amounts and estimates shown above can be set to suit multiple configurations, and are used for symbolic estimation purpose only.  The actual figure depends on lots of issues including quantity of sun (cloud coverage), single or dual axis tracking, cabling (DC/AC), electrical connections and electronic losses etc.  These amounts and figures should be considered as example only, and under whatever circumstances, we do not make any guarantee, or cannot be held responsible about these estimates, if used as an actual return to investment!


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