July2017

Low-energy homes don’t just save money, they improve lives

Household energy use is a significant contributor to global carbon emissions. International policy is firmly moving towards technology-rich, low- and near-zero-energy homes. That is, buildings designed to reduce the need for additional heating, cooling and lighting. They use efficient or renewable energy technology to reduce the remaining energy use. But what about the experiences of […]

The electricity sector needs to cut carbon by 45% by 2030 to keep Australia on track

Our new ClimateWorks Australia report, released today, shows that the electricity sector needs to deliver a much greater cut than the 28% emissions reduction modelled in the Finkel Review if Australia is to meet its overall climate target for 2030. When Australia’s energy ministers meet this Friday to discuss (among other things) the Finkel Review released last month, they will […]

Climate and the G20 summit: some progress in greening economies, but more needs to be done

On July 7, G20 leaders will gather in Hamburg for their annual meeting. One likely outcome: another clash over climate change between the host government, Germany, and United States president Donald Trump. As the Chinese did last year, German Prime Minister Angela Merkel has prioritised climate on the G20 agenda, just when the US administration is rolling […]

The government’s new energy plans will leave investors less confident than ever

Australians should be deeply concerned about the signals coming from the Turnbull government since this month’s release of Chief Scientist Alan Finkel’s report on the future of Australia’s electricity system. On Tuesday the government announced a new package of policies for the electricity sector. This includes asking the Australian Energy Market Operator (AEMO) to look at “how to ensure […]

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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.