January2017

Despite the hype, batteries aren’t the cheapest way to store energy on the grid

The Australian government is reviewing our electricity market to make sure it can provide secure and reliable power in a rapidly changing world. Faced with the rise of renewable energy and limits on carbon pollution, The Conversation has asked experts what kind of future awaits the grid. Storage is the word of the moment in […]

Solar Impulse’s biggest legacy will be in your home – not in the skies

After 12 years of planning and testing, Solar Impulse has finally completed its epic voyage around the world. The solar-powered plane first set off from Abu Dhabi 16 months ago, and it has since travelled some 25,000 miles (40,000km) over 17 gruelling legs – all without using a single drop of fuel. Solar Impulse is […]

The plug and play city: how shipping containers are changing infrastructure

We often take for granted our access to vast quantities of inexpensive goods manufactured overseas. And we often overlook the unassuming innovation that has made this global industrial revolution possible: the shipping container. While the shipping container was conceived in the 1950s by American businessman Malcom McLean, it was only widely adopted after the US […]

Will the latest electricity review bring climate and energy policy together at last?

The Australian government is reviewing our electricity market to make sure it can provide secure and reliable power in a rapidly changing world. Faced with the rise of renewable energy and limits on carbon pollution, The Conversation has asked experts what kind of future awaits the grid. Australia’s National Electricity Market (NEM) is under review […]

Oslo’s ambitious ‘climate budget’ sets the bar for other cities

Oslo’s city government has issued an ambitious “climate budget” with the intent of halving its carbon emissions from 1990 levels by 2020, and becoming completely carbon neutral by 2030. To achieve this goal, the city plans to limit access for cars with new tolls and fewer parking spaces, power the bus fleet with renewable energy, […]

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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.