Should You Add a Battery to Your Existing Solar System?
Already installed solar panels but wondering if a battery is worth the investment? In this guide, we break down the pros, cons, and key benefits of pairing a home battery with your current solar system—so you can make an informed decision.
⚡ How Solar Batteries Work with Existing Solar Panels
Solar batteries store the excess energy your panels produce during the day, so you can use it later—like at night or during a blackout. Without a battery, any extra power goes back to the grid, often at a lower rate than you pay to buy electricity.
💰 When a Battery Is Worth It
Adding a battery makes sense if:
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Your feed-in tariff is low
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You want energy independence
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You’re in an area prone to blackouts
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You want to join a Virtual Power Plant (VPP) to earn credits or income
If your daytime usage is high and your export value is low, a battery can significantly boost your savings. Find out more on our battery buying guide
📊 Pros and Cons of Adding a Battery
| ✅ Pros | ⚠️ Cons |
|---|---|
| Use more of your solar | High upfront cost |
| Backup during outages | ROI depends on usage |
| Reduce grid reliance | May be unnecessary with high FIT |
| Access VPP or time-of-use optimisation | Limited lifespan (typically 10-15 years) |
🧠 Real-World Example
Let’s say your solar exports 10 kWh/day and your FIT is 6c per kWh. That’s just $0.60 a day. If you instead store that power and avoid buying it at 30c per kWh, you save $3.00/day—over $1,000/year. That could go toward repaying the cost of a battery and protecting you during blackouts.
🔋 Battery Benefits Beyond Savings
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Energy Security: Stay powered during grid outages.
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Tariff Arbitrage: Charge when rates are low, use when they’re high.
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Virtual Power Plants (VPPs): Get paid to participate in grid services.
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Sustainable Living: Reduce your carbon footprint even further.
🧭 Who Shouldn’t Add a Battery (Yet)?
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Households with a high feed-in tariff
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Low solar excess (most energy used during the day)
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Tight budgets or shorter-term plans in the home
📌 Conclusion: Is a Battery Right for You?
If you’re focused on maximising savings, avoiding blackouts, or future-proofing your home energy, adding a battery can be a smart next step. But it’s not one-size-fits-all.
Have our installers figure all this out for you here by entering your details