STC calculator | 2021 Solar Rebates


Hello 2021! The start of a new year brings new beginnings, new opportunities, new Small Technology Certificate (STC) calculations and new solar rebate prices. Here’s all you need to know about what’s changing in solar in 2021.

Key items:

      • Rebates are reducing in 2021 – get quotes for tailored information on rebate eligibility for your property.
      • STC calculator | the STC deeming period is reducing to 10 in 2021.
      • Not sure what system size you require! Our solar quiz will let you know!
      • A 6.6kw system rebate now varies between $3960-$2893 depending on your zone.

Solar Rebate Frequently Asked Questions solar rebate

Rebates can be a tricky topic of conversation. Here are a few frequently asked questions about solar rebates.

1. By How Much Will The Solar Rebate Reduce By?

As previously explained in our blogs, every year on January 1st solar rebates are reduced. To calculate a solar rebate use the following formula: kW solar system size X deeming period in years x zone rating= the number of STC’s you’re eligible for.

Once you know how many STC’s you are eligible for, times the number of STC’s by $37 as this is the average rate of an STC (STC’s can range from $34 -$40).

Let’s say you are looking at installing a 6.6kw system in zone 1. In 2020 you would have received a rebate of roughly $4357. In 2021 you will receive a rebate of roughly $3960. This is a rebate reduction of $397.

solar home save money2. Is Solar Worth It Anymore?

Yes, because regardless of rebates or feed-in tariffs, solar panel systems allow you to self-generate electricity- meaning you do not have to buy energy from the grid during the day. Solar panel systems are an asset that has a short return on investment and keeps you saving for up to 25 years!

To find out what solar could do for you, head over to our solar calculator. It gives you information on system sizes, return on investment periods and what your new energy bill would look like if you invested in solar.

STC Calculator | Rebate Estimates 2021

Below is a table that estimates the STC’s and rebates available per system size and zone for 2021. These numbers are based on the average STC price of $37 dollars.

System Size in KW2021- Deeming PeriodZone RatingEstimated STC’sEstimated Rebate

How To Get Solar PanelsHow To Get The Best Possible Rebate

If you are thinking about installing solar the take-home message is to complete your installation sooner rather than later.

With each passing year, the rebate value will decrease leaving you with less financial support for your investment.

If you are after the best rebate possible, Solar Market offers complimentary solar quotes from three CEC accredited solar installers in your area, so that you can get the best information, recommendations and deals.

Ready to start saving? Let’s get you connected with quotes.

Request 3 Complimentary Solar Quotes


Take our Solar Quiz Compare Energy Providers and Save

Download Your FREE Ultimate Guide to Solar Power in Australia - 2021 Edition

Beginners Guide to Solar Power

If you’re considering solar for your property or just looking to maximise the savings for your solar system, download a FREE copy of our "Ultimate Guide to Solar Power in Australia - 2021 Edition".

Become an expert and better understand the ins and outs of solar power and solar PV systems for your property.

Includes detailed explanations and diagrams of the various types of solar systems and their parts, solar battery storage systems, Government incentives, expected ROI periods, finance, energy-saving tips and more!

Download Your Free Copy Now!

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Understanding Batteries

Off-Grid Systems

For some households a battery system can be of great benefit and minimise a home’s reliance on the grid. However, it’s important to understand for a battery to be useful your solar system needs to be generating excess energy for the battery to store, which you can then use at night or when the sun is not out.

When selecting a battery, you’ll want to invest in a system that is most suited to your home and can drive the best return on investment (ROI). Despite a larger upfront cost, a higher quality battery may significantly increase your ROI.

    Battery systems start from $6,000 and costs can vary greatly based on the following factors:

  1. Cycle Life-Time

    The number of times a battery can fully charge and discharge.

  2. Battery Power (kW)

    How fast it can be charged or discharged.

  3. Storage Capacity (kWh)

    The maximum amount of energy a battery system can store.

  4. Battery Management System (BMS)

    An electronic ‘smart’ system that gathers data and manages the battery ensuring it does not overload or operate outside of its safe functioning zone..

  5. Inverter

    Battery systems require their own inverter if your solar system does not have a hybrid inverter.

  6. 'All-In-One Unit’

    A system which includes the battery, BMS and an inverter all in one unit.

  7. Warranty

    Length of time or cycles the battery system is under guarantee.

  8. Blackout Protection/Backup

    It’s important to note this is not a common feature of a battery system and could cost thousands of dollars to include. Blackout protection not only requires additional components but also a specialised installation and rewiring. For grid-connected homes, the cost for blackout protection can outweigh the benefit.

Additionally, if your purpose for adding battery is to go Off-Grid and become completely independent from the grid you will need to ensure your solar system can generate enough energy to power your home and your battery system is large enough to store this energy. For homes in metro areas going Off-grid is not cost effective and is only recommended for those in remote areas with limited access to the grid. Off-grid solar systems with battery start at approximately $30,000.

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