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Adding a solar battery to your home is a smart step toward energy independence—but it’s also a significant investment. With so many products, installers, and technical terms involved, comparing quotes can feel daunting. This guide is here to help you cut through the confusion, focus on what matters, and confidently choose a reliable supplier who offers the best value for your needs.
How to Compare Solar Battery Quotes and Choose the Right Installer
The cheapest quote isn’t always the best deal. When comparing solar battery systems, focus on key factors like usable capacity, power output, round-trip efficiency, and warranty terms. Check that the installer is SAA-accredited and that the retailer is a NETCC Approved Seller. Look for transparent, itemised quotes that include installation, monitoring, and any required switchboard upgrades. A reputable local supplier with solid reviews and Australian-based support can make all the difference.
What should a solar battery quote include?
A quality quote should clearly explain what you’re paying for—and what you’re getting. Watch for the following:
Battery performance specs
- Usable capacity (kWh): This is the real storage value, not just the battery’s total capacity.
- Power output (kW): Tells you how many appliances the battery can run at once.
- Depth of discharge (DoD): Higher is better; most lithium batteries offer 90–100%.
- Round-trip efficiency: Good systems exceed 90%, meaning you retain more of your stored energy.
- Battery chemistry: LFP (Lithium Ferro Phosphate) batteries are safer and more durable than older types.
Warranty details
Look beyond just the number of years. A good warranty will also specify:
- Minimum retained capacity at the end of the term (e.g., 70–80%)
- Number of cycles covered
- Total energy throughput (e.g., 30 MWh over 10 years)
Inverter and system design
If you’re retrofitting a battery, the quote should outline whether your current inverter is compatible. Some systems may require:
- A hybrid inverter (for DC-coupled batteries)
- A separate battery inverter (for AC-coupled setups like Tesla Powerwall). Quotes should also clarify if the system provides blackout backup and which circuits it will support.
Understanding installation and total cost
Every quote should provide an itemised breakdown of:
- Installation labour and materials
- Switchboard or meter upgrades (if required)
- Monitoring hardware and software access
- GST and any rebates (e.g., STCs or state battery incentives)
Be wary of vague or bundled pricing. Ask for transparency, especially if your property has difficult access or non-compliant wiring that may increase costs.
Some suppliers include estimated payback periods—just make sure to question the assumptions used, such as electricity prices or your daily usage profile.
How to compare quotes fairly
Once you’ve gathered a few detailed quotes, here’s how to make an apples-to-apples comparison:
- Price per usable kWh: Divide the total cost by usable capacity to compare system value— but don’t stop there.
- Performance and efficiency: Higher DoD and round-trip efficiency mean better long-term returns.
- Warranty strength: Compare not just years, but throughput and performance guarantees.
- Inverter compatibility: Retrofitting? AC-coupled systems like Tesla or Sungrow are simpler. New build? DC-coupled systems can be slightly more efficient.
- Installation inclusions: Ensure quotes cover all potential extras, like switchboard upgrades or backup configuration.
- Monitoring options: Make sure you can track energy usage and battery health via a user-friendly app or portal.
Choosing a reputable supplier
Your installer’s credentials matter as much as the product itself. Always check that:
- Installers are SAA-accredited for battery systems (ask for their accreditation number).
- The retailer is a NETCC Approved Seller, meaning they follow best-practice consumer protections.
- The company has a strong local presence, with good reviews and verifiable customer references.
- The battery brand has Australian-based support in case of warranty claims or issues.
A good supplier will also conduct a site assessment—either in person or virtually—to ensure the system is properly sized and designed for your home.
Smart questions to ask before you commit
Before signing a contract, get clear answers to these:
- Will this battery work with my existing solar setup?
- Does the system provide backup power, and for which circuits?
- What are the exact warranty terms (years, cycles, and throughput)?
- Who handles warranty claims—you or the manufacturer?
- Are there any additional costs beyond what’s listed in the quote?
- How long have you been installing batteries?
- What’s your policy on battery recycling or disposal at the end of life?
Final thoughts: Value is more than just numbers
The best solar battery quote isn’t necessarily the cheapest—it’s the one that balances quality, performance, transparency, and long-term support. A well-installed battery system will help you store more of your own solar energy, reduce reliance on the grid, and better withstand blackouts.
If you’re ready to take the next step, Your Energy Answers can connect you with local, accredited installers who can offer honest advice and obligation-free quotes tailored to your home.
