Avoid These Common Mistakes Before Claiming the Battery Rebate
With the new Federal Home Battery Rebate creating a surge of interest in energy storage, millions of Australians with existing solar systems are now asking: Can I finally afford a battery? The answer isn’t as straightforward as many think. Before you rush to claim the rebate, it’s critical to ask: Is your current solar setup actually compatible with a battery?
At Your Energy Answers, we’ve spoken to thousands of homeowners, and the #1 mistake we see is assuming any solar system can simply “add a battery.” The reality is far more nuanced. Here’s what you need to know before making the leap.
1. Size Matters: Why Small Solar Systems Might Not Cut It
Australia has over 4 million rooftop solar systems, but many are simply too small for battery integration. Systems installed between 2006 and 2015 often range from 1.5 kW to 4 kW. That’s like trying to power a double-decker bus with a Shetland pony—it won’t work.
The Federal Battery Rebate requires at least a 5 kWh battery. To charge a battery of that size effectively, your solar system should be at least 6.6 kW. If your solar is below this threshold, you’ll likely need a new, larger solar system to benefit from the battery rebate.
2. Hidden Problems with Your Existing Solar System
Even if your system is technically large enough, other issues may hold you back. Before adding a battery, a full solar health check is essential.
Faulty panels or wiring: A non-functioning string of panels can go unnoticed for years, especially if your monitoring app is outdated or missing.
Pigeon nests and shading: Nesting birds can damage cables and reduce output. Installing a pigeon guard may be necessary.
Non-compliant switchboards: Older or overloaded switchboards may need to be upgraded before they can handle battery flow safely.
Tip: If your installer isn’t willing to inspect your home in person before recommending a battery, that’s a major red flag.
3. Inverter Compatibility: Hybrid vs Non-Hybrid Systems
Most legacy systems use standard (non-hybrid) inverters, which aren’t compatible with DC-coupled batteries—the kind that connects directly to the solar system.
If your current inverter is in good condition, consider an AC-coupled battery like the Tesla Powerwall 2 or the Franklin WH. These connect on the other side of your switchboard, allowing you to keep your existing inverter and panels.
Some batteries, like the Sigenergy SigenStor, offer the flexibility to operate as either AC or DC-coupled, making them a strong option for future-proofing.
4. Should You Add To Your Solar or Start Fresh?
You have two main choices:
A. Add a second solar system
If your roof space allows, you could bolt on an additional 6.6–10 kW system separately, keeping your old one intact and pairing everything with an AC battery. This can be cost-effective, especially as panel prices continue to fall.
B. Replace the whole system
If your current solar is poorly positioned, old, or underperforming, a complete upgrade may make more sense. Inverters have become cheaper and more powerful, and newer panels are more efficient. A single large system with a new inverter and battery often delivers better long-term value.
5. Battery Installation Is Not Plug-and-Play
Even if you’ve picked the perfect battery, installation location matters—a lot.
Avoid installing near windows, habitable rooms, or flammable materials.
Western and northern walls are often too hot. Batteries hate heat.
Southern or shaded eastern walls are usually ideal.
If installing in a garage, bollards are often required to protect the battery from vehicle impact.
Finding a suitable spot can be harder than it seems. A proper site inspection is non-negotiable.
6. Don’t Forget Monitoring—It’s Crucial
Good monitoring gives you control. Without it, your system could silently fail, costing you hundreds in lost savings.
Ask your installer:
Will the monitoring app be set up on all family devices?
Will you show me how to use it?
What happens if Wi-Fi disconnects—how do I reconnect?
With proper monitoring, you can:
Run air conditioning guilt-free during peak solar hours
Time your washing, cooking, and EV charging to align with solar output
Track real-time battery usage to maximise savings
7. How Much Will a Battery Save You?
Solar alone often cuts your bill by 50–60%. A well-sized battery can shave off another 30%, especially when combined with smart charging strategies and Virtual Power Plant (VPP) participation.
While a battery won’t always bring your bill to zero, it can get you very close, with better energy independence and resilience along the way.
Final Thoughts: Don’t Get Burnt by a Remote-Only Battery Quote
If a company offers you a battery without physically inspecting your property, walk away. Every home is different—roof layout, switchboard, inverter, and lifestyle habits all affect what’s possible.
Get your solar health checked. Choose a battery type that fits your setup. Monitor everything. And only trust local, reputable installers who show up in person.
