Battery Storage: Is It Worth It?

Home batteries are the most asked-about topic in solar. Here's an honest assessment.

How home batteries work

A battery stores excess solar energy generated during the day for use at night or during peak pricing periods. Without a battery, your excess solar is exported to the grid at a feed-in tariff rate (typically 4–8¢/kWh) — with a battery, you use it yourself instead of buying from the grid at 25–35¢/kWh.

The main brands in Australia

Tesla Powerwall — The most recognised brand. 13.5kWh capacity, sleek design, good app. Typically $12,000–$16,000 installed. Long track record in Australian conditions.

Sungrow — Growing rapidly in Australia. Competitive pricing, good integration with Sungrow inverters. Typically $9,000–$13,000 installed.

Alpha ESS — Popular in Australia with good local support. SMILE series offers modular capacity. Typically $10,000–$14,000 installed.

BYD — Major Chinese manufacturer. Battery Blade technology offers good safety and longevity. Often paired with Fronius or SMA inverters.

The payback question

Here's where most sales pitches fall short. A typical 10kWh battery costs $10,000–$14,000. If it saves you $3–$4/day on electricity (a realistic estimate for many households), that's $1,100–$1,460/year — meaning a payback period of 7–12 years. Most battery warranties are 10 years.

When batteries make more sense: - You have high evening electricity usage - Your electricity rate is above 30¢/kWh - Your feed-in tariff is below 5¢/kWh - You want blackout protection - You can participate in a Virtual Power Plant (VPP) program for extra credits

When they may not make sense yet: - Your feed-in tariff is above 8¢/kWh - You're rarely home in the evenings - Budget is a concern (solar alone pays back much faster)

Virtual Power Plants (VPPs)

Some retailers and networks offer VPP programs where your battery participates in grid stabilisation. You receive credits or payments for allowing your battery to be charged/discharged during peak demand. This can improve the economics significantly — some VPP participants earn $500–$1,000/year.