Battery Storage For Solar – What You Need To Know


Solar Power DiagramThis year an expected 70,000 Australian households are predicted to install batteries according to Bloomberg NEF (BNEF) who specialise in research for clean energy. This will make Australia 30% of the global battery demand forecasted for 2019 with battery uptake to triple across the nation.

So why have batteries suddenly become the trend for Australia in 2019? Well, it’s the obvious next step for combating expensive power bills with Australia’s excessively high electricity rates which have already made 1 in 5 Aussie households turn to solar.
While the benefits of batteries are still secondary to the benefits of solar itself, for some households a battery system can be of great benefit and minimise a home’s reliance on the grid or allow you to become 100% independent from the grid as part of a standalone (off-grid) system. But is a battery for you? Here are some facts and information that may help you decide!

A Batteries Purpose

A Batteries Main Purpose Is To Store Excess Solar Energy From Your Solar PV System During The Day For Use At Night 

For a battery to be useful your solar system needs to be generating excess energy for the battery to store. This excess energy is there for you to run your household at night or when the sun is not out. If you have a solar system without battery your home will run off the grid during these times and any excess energy will be fed to the grid in return for the feed-in tariffs.

Home Battery Prices Are Dropping

In the past, the cost of batteries has outweighed the benefits, with the return on investment being impractical for the average household. Now as technology has advanced, and the market has expanded, batteries are continually decreasing in price, becoming a desirable and practical purchase for Australians wanting to maximise energy savings and further reduce their bills. Prices can range from around $2,000 to $20,000 + depending on the size, brand and functionality of the battery system.

Those with smaller solar systems that aren’t generating a large amount of excess power may find it more cost-effective to continue to receive feed-in tariffs for their excess power instead of purchasing a battery. Those with large solar systems and a substantial amount of excess power could benefit greatly from installing battery storage.  See Battery Prices Here

A Batteries Life Expectancy Is Dependent On Cycles

A batteries lifespan is based on the number of times it can be fully charged and discharged before the battery reaches the end of its functional life.  To put it in perspective if you were to do one cycle per day (charge then discharge) on a 10,000-cycle battery you’d be looking at roughly a 27 years lifespan. This is an important specification to look for when comparing battery prices.

You Can Retrofit A Battery To Your Existing Solar System

To retrofit a battery system to an existing solar system requires adding a battery inverter, a metering unit and the battery to your system. A battery inverter is different from a solar inverter which your system will already have. A solar inverter will only convert DC power from the panels into AC power for your home. Battery inverters can convert DC power into AC and vice versa, which allows the battery to be charged from the solar system and discharged to power your home when the sun is not out.

…Or Set Your System Up So It’s Battery Ready

A battery ready system has all the additional components installed and is ready for you to add batteries whenever you’re ready. This may mean you have opted for a hybrid inverter when installing your solar system with the anticipation you may add a battery in the future. A hybrid inverter is an all-in-one inverter (solar and battery).

Whilst hybrid inverters are pricier than the standard solar inverter, opting for a hybrid can save you money in the long run if you’re planning to add a battery.

Having Battery Storage Does Not Mean You Have Black-Out Protection

It’s important to note that having a battery does not mean you have protection from blackouts. Battery with backup for blackout protection requires additional components, a compatible inverter (not all are compatible) and a solar battery system large enough to generate and store energy through a blackout. The cost of these additions in most circumstances will outweigh the benefits. It’s also unlikely your battery will have enough energy stored to power your entire house through a blackout. Meaning when installing backup you will need to have in mind what appliances will be a priority to keep running should a blackout occur. This will give the installer guidance when re-wiring and installing your battery with backup.

Having A Battery Does Not Mean You Are Off-Grid

If your purpose for adding battery is to go completely Off-Grid it will come at a price. Off-grid solar systems with battery backup start at approximately $30,000 due to the solar and battery system needing to be large enough to have no reliance on the grid. 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.

Is Adding Battery For You?

  • Do you have a solar system with a substantial amount of excess energy being fed into the grid? Or
  • Planning to install a solar system large enough to run your home through the day with excess power at night?
  • Are you fed up with low feed-in tariff rates and being charged high rates when using the grid?
  • Do you want more energy independence?

If you’ve answered yes to most of the above then it’s time to consider batteries!


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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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