2 min read
20 Smart Questions to Ask Before Signing Your Solar and Battery Contract
Gemma Cullan
May 15, 2025
Investing in a solar and battery system for your home is a significant decision. To ensure you're making the right choice and getting exactly what you need, it's crucial to ask the right questions before you sign any contract. At Reposit, we believe in empowering homeowners with information. Here's a list of key questions to ask your solar and battery salesperson:
About the System and Performance:
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What is the total size (in kW) of the solar panel system being quoted? Ensure it aligns with your energy needs and roof space.
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What is the make and model of the solar panels being used, and what are their efficiency and warranty? Understand the quality and lifespan of the panels.
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What is the size (in kWh) and type (e.g., lithium-ion) of the battery being quoted, and what is its usable capacity, depth of discharge, and warranty (including cycles and capacity retention)? Understand the battery's capabilities and lifespan.
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What is the make and model of the inverter (and is it hybrid if a battery is included), and what is its efficiency and warranty? The inverter is the brains of the system.
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What is the estimated annual energy production of the solar system based on my location and roof orientation? Get realistic expectations of energy generation.
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What is the estimated self-consumption rate I can expect with this system, and how will this be optimised? Understand how much of your generated energy you'll actually use.
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What is the expected payback period for this system based on my current electricity usage and potential savings? Understand the financial return on investment.
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Does the system include monitoring, and what information will I be able to access (e.g., energy production, consumption, battery status)? Understand how you can track your system's performance.
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What are the system's capabilities during a power outage? Will it provide automatic backup power, and what appliances can it run and for how long? Understand whether the system is capable of operating and powering your home in a blackout.
About Installation and Logistics
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Who will be installing the system (e.g., direct employees or subcontractors), and are they Clean Energy Council (CEC) accredited? Ensure the system will be installed by qualified and reputable installers.
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What is the estimated timeframe for the installation process, from contract signing to system activation? Understand how long it will be before your system is fully operational.
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What is included in the installation cost? Are there any potential additional fees? Get a clear breakdown of costs.
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What permits and approvals are required, and who is responsible for obtaining them? Understand the regulatory process and if you are required to assist with or do anything.
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How will the solar panels be mounted on my roof, and what measures will be taken to ensure no damage or leaks? Address potential roof concerns. You may want to consider the age of your roof, or type of roof you have; is it a tin or tiled roof, and whether you have any spare tiles.
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What are the maintenance requirements for the system, and do you offer any ongoing support or maintenance packages? Understand the long-term care requirements for the system and who is responsible for them.
About the Contract and Company
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What is the total cost of the system, including GST and any applicable fees excluding any available rebates or subsidies? Understand the final price and how much you will be out of pocket.
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What are the payment terms and schedule? Understand when payments are due, if finance is being provided and the process to obtain finance.
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What are the warranty terms for the entire system, including workmanship? Ensure comprehensive coverage.
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What is the company's history and reputation? Can you provide references from previous customers in my area? Check the credibility of the company and ensure they complete a high standard of work.
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What is the process for contacting Customer Support if I have any questions or issues after installation? Understand their after-sales service and ensure you have somebody to contact if you have any questions or a problem with your system.
By asking these questions, you'll be well-equipped to make an informed decision and choose a solar and battery system that meets your needs and provides long-term value for your home. Don't hesitate to seek clarification on any points you don't fully understand before signing on the dotted line.