Solar Battery Storage

Solar panel and a battery

If you are considering adding batteries to a new or existing solar power system, but don't know where to start, you've come to the right place.

Batteries are becoming more cost-effective over time, and in 2018 energy storage can make financial sense for some solar owners in rare cases.

As energy storage is a big investment, ensure you understand the basics before parting with your cash.

At the end of this page are links to everything I think you need to know about batteries.

But first, an introduction to solar batteries in Australia:

Solar battery storage has been around for decades, but it has always been very expensive.

All that changed in May 2015, when Tesla announced it was taking reservations for its new Powerwall energy storage system (and its successor, the Powerwall 2, was announced in late 2016).

The lower price point and 10 year warranty had many people excited at the prospect of affordable batteries for their grid connected solar system.

Soon after the Powerwall was announced, many other battery manufacturers (LG, Samsung, etc) announced they would start selling solar batteries with a similar price, performance and warranty, and the Aussie battery revolution began.

With Australian households paying high rates to buy electricity (25 – 54c per kWh), but getting a pittance for exporting electricity (0-18c per kWh), this new generation of battery packs can save money by allowing you to use your solar-generated energy 24 hours a day.

Tesla PowerwallJust to be clear, the Powerwall 2 and competing 'next generation' battery systems have not suddenly made going off-grid in the suburbs economically viable.  That's because, for the average Aussie home, going fully off grid will require lots of Powerwalls, an expensive off-grid inverter, a backup generator and substantial rewiring. Expect no change from $30,000 to go off grid, and expect to replace your batteries every 10 years or sooner.

The Powerwall and its competitors are designed for hybrid solar systems. That is, solar power systems with batteries that are still connected to the grid. For a new 5kW hybrid solar energy system with a single Powerwall 2, expect to pay about $18,000. Or to add a Powerwall 2 to an existing solar power system, expect to pay around $11,000.

But before you run off and buy a fancy new battery pack for your home – there are a number of things you need to understand to ensure you get a storage system that will reduce your bills as much as possible while providing the features you expect.

Here's everything I think you should know about solar battery storage before jumping in:
 

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