The Complete Solar Installation Checklist:

What to Consider Before Installing Solar

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Installing solar is a significant investment. The right system should do more than fit on your roof. It should suit your household’s electricity usage, future plans, budget and long-term energy goals.

Before accepting a quote, work through this checklist to ensure you’re comparing systems properly and choosing an installation that will deliver value for years to come.

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1. Understand Your Electricity Usage

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Before discussing panels or inverter brands, look closely at how your household currently uses electricity.

• Review at least 12 months of electricity bills
•  Calculate your average daily electricity consumption
• Check whether your usage changes significantly between summer and winter
• Identify when you use the most power: morning, daytime or evening
• Consider whether someone is regularly home during the day
• Check whether you are on a flat-rate or time-of-use electricity tariff

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Your consumption pattern matters as much as the total electricity you use. Solar is most valuable when electricity is used as it is generated rather than exported to the grid for a lower feed-in tariff. Before looking at future energy needs, think about how those changes could affect your household’s solar demand.

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A solar system should be designed for where your household is heading, not only how it operates today.

• Are you planning to buy an electric vehicle?
• Will you install a home battery in the future?
• Are you adding air conditioning, a pool or a spa?
• Could more people be living in the home?
• Are you planning an extension, a granny flat, or a home office?
• Will gas appliances eventually be replaced with electric alternatives?

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A system that suits your current bill may become undersized if your energy consumption increases over the next few years.

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3. Check Whether Your Roof Is Suitable

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Not every roof offers the same solar potential. Its condition, direction, available space, and surrounding shade influence the final design.

• Confirm the roof is structurally sound
• Check whether repairs or restoration will be required soon
• Identify the roof material and pitch
• Measure how much usable roof space is available
• Check for shade from trees, neighbouring buildings, antennas and roof features
• Consider how shade patterns may change throughout the year
• Identify vents, skylights and other obstructions
•  Consider whether planned extensions could affect the panel layout

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If your roof needs replacing soon, it is better to complete that work before installing solar. Removing and reinstalling panels later adds unnecessary expense.

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4. Choose the Right System Size

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The largest system is not automatically the best. The right size depends on your consumption, roof capacity, local network rules, budget, and plans for future electrification.

• Compare the proposed system size with your daily electricity use
• Ask how much energy the system is expected to generate annually
• Check how much solar you are likely to use directly
• Ask how much electricity may be exported
• Confirm whether local export limits apply
• Consider leaving capacity for future electricity needs
• Ask whether a larger system would produce worthwhile additional savings

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Be cautious if a salesperson recommends a system size without asking for your electricity bills or discussing how your household uses power.

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5. Decide Whether You Need a Battery

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A battery can help you use more solar energy at night, but it must be correctly sized and financially suitable for your household. Calculate how much excess solar the system is likely to generate

• Review how much electricity you use after sunset
• Decide whether backup power is important
• Ask which appliances will operate during a blackout
• Confirm whether backup requires additional equipment
• Compare the battery’s usable capacity, not only its advertised capacity
• Review its expected cycle life and warranty
•  Ask whether the battery can participate in a Virtual Power Plant
• Compare the expected savings with the total installed cost

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The decision should be based on consumption data rather than a general promise it will eliminate your electricity bill. Solar panels can look similar from the ground, but product quality, performance, and warranty support vary considerably.

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•  Ask for the exact panel brand and model number
• Review the product warranty
• Check the performance warranty
• Compare panel efficiency
• Review temperature performance
• Confirm the manufacturer has an established Australian presence
• Ask how warranty claims are managed
• Check whether replacement panels are likely to be available later
• Confirm the panels are approved for installation in Australia

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Terms like “premium panels” and “tier-one panels” are not substitutes for an actual brand, model number, and warranty document.

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7. Compare Inverter Options

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The inverter converts electricity from your panels into usable household power. It also plays an important role in system monitoring and future battery compatibility.

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• Ask for the exact inverter brand and model
• Confirm whether it is a string, hybrid or microinverter system
• Check its efficiency rating
• Review the product warranty
• Confirm monitoring is included
• Ask whether monitoring access is free or subscription-based
• Check whether the inverter is compatible with future batteries
• Confirm whether the inverter is appropriately sized for the panel array
•  Ask where the inverter will be installed
• Check that the proposed location is protected from excessive heat and weather

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A cheaper inverter may lower the upfront cost, but poor reliability or limited local support can lead to much higher costs later.

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8. Check Your Switchboard and Electrical System

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Some homes need electrical upgrades before solar can be safely connected.

• Ask whether your switchboard is suitable
•  Check whether safety switches or circuit protection need upgrading
• Confirm whether the property has single-phase or three-phase power
•  Ask whether the meter needs to be replaced or reconfigured
• Identify any asbestos-containing switchboard materials
• Confirm whether additional costs are included in the quote
• Ask whether switchboard work could affect the installation timeline

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A reputable installer should identify upgrade requirements before installation, not surprise you with major additional costs on the day.

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9. Understand the Proposed System Design

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A solar quote should include more than just system size and total price.

• Request a clear panel layout
• Check the proposed panel orientation
• Review the expected impact of shade
• Ask whether panels will be installed across multiple roof directions
• Confirm the location of the inverter and battery
• Ask how cables and conduits will be installed
•  Check whether visible conduit will be neatly positioned
• Confirm appropriate access and clearance around equipment
• Ask whether panel-level optimisation is necessary
• Check the estimated annual generation

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The cheapest layout may not produce the best long-term result. Panel positioning should balance energy production, roof limitations, safety, and property appearance.

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10. Research the Installer

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The quality of installation is as important as the equipment installed.

• Confirm who will perform the installation
• Check the installer holds the required licences and accreditation
• Ask whether the company uses employees or subcontractors
• Confirm the business has appropriate insurance
•  Check how long the company has been operating
•  Read recent independent customer reviews
• Look for examples of completed installations
• Ask who handles faults and warranty claims
• Confirm the company services your area after installation
• Check that you will receive compliance documentation

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A strong equipment warranty offers limited protection if the original installer is unavailable or unwilling to help when issues arise.

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11. Compare Quotes Properly

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Two quotes with the same system size can still include very different equipment, workmanship, and after-sales support.

• Compare exact panel and inverter models
• Compare battery capacity and functionality
• Review the proposed layout
•  Check whether switchboard or meter upgrades are included
•  Confirm installation and labour costs
• Check whether monitoring setup is included
• Compare product and workmanship warranties
• Review estimated annual generation
•  Identify any allowances or potential additional charges
• Confirm the final price after incentives
•  Ask whether difficult access or roof conditions could increase the cost

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Avoid deciding based on price alone. A cheap quote may exclude important work, use lower-quality components, or offer limited support after installation.

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12. Understand Rebates and Incentives

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Solar and battery incentives can reduce upfront costs, but availability and eligibility may change.

• Ask which federal incentives have been included
•  Check whether the incentive is already deducted from the quote
• Confirm who will claim any certificates or rebates
• Research available state or territory programs
• Check whether finance or interest-free loan programs are available
• Review eligibility requirements carefully
• Confirm whether a battery must meet specific technical requirements
• Do not rely solely on a salesperson’s description of an incentive

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Always verify current programs through official government sources before signing a contract.

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13. Review Finance Carefully

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A low weekly repayment does not always mean the system offers good value.

• Compare the cash price with the financed price
• Check the interest rate
• Review establishment, account and early repayment fees
• Calculate the total amount repayable
• Confirm the length of the finance agreement
•  Ask whether finance changes the system price
• Compare repayments with realistic electricity savings
•  Check whether the debt is secured against the property
• Read the cancellation and cooling-off conditions
• Confirm whether any deposit is required
• Ask when repayments begin
• Check whether payment frequency can change
• Confirm whether finance is provided directly or through a third party
• Ask what happens if you miss a payment
• Review any other charges or conditions

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Solar finance should be transparent. If the financed price is much higher than the cash price, ask for a clear explanation.

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14. Check Your Electricity Retail Plan

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Your solar system and electricity plan must work together.

• Compare feed-in tariff rates
• Check daily supply charges
• Review peak, shoulder and off-peak import rates
• Ask whether your current plan will change after installing solar
• Check whether special solar plans include higher usage charges
• Consider whether time-of-use pricing suits your household
• Review your electricity plan regularly after installation

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The retailer offering the highest feed-in tariff is not always the cheapest overall. Compare the whole plan, not just one advertised rate.

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15. Review Every Warranty

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A solar system may include several separate warranties, each with different conditions.

•  Panel product warranty
• Panel performance warranty
• Inverter warranty
•  Battery product warranty
• Battery performance or throughput warranty
• Mounting system warranty
• Installer workmanship warranty
• Roof penetration warranty
• Monitoring equipment warranty
• Installer-backed service support

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Ask who to contact if something fails, whether labour is covered, and if there are call-out or transport charges. A long warranty can sound impressive but still exclude many costs of replacing faulty equipment.

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16. Ask What Happens After Installation

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Installation day should not end the relationship.

• Confirm who organises grid connection and meter changes
• Ask when the system can be switched on
• Confirm monitoring will be configured for you
• Request instructions for using the monitoring platform
• Ask what documentation you will receive
• Confirm how faults should be reported
• Ask how quickly service requests are usually handled
•  Keep copies of invoices, warranties and compliance certificates
• Schedule regular checks of system performance

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Monitoring your system helps identify faults, unexpected drops in production, or changes in household consumption before they significantly affect your savings.

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Warning Signs to Watch For

Be cautious if a solar company:

• Refuses to provide exact equipment model numbers
• Recommends a system without reviewing your bills
• Promises you will never receive another electricity bill
• Pressures you to sign immediately
• Claims an incentive is ending without providing evidence
• Cannot explain the proposed panel layout
• Avoids questions about subcontractors or after-sales service
• Provides savings estimates that appear unrealistic
• Offers a quote with major costs left as “to be confirmed”
• Has no clear process for handling warranty claims

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Your Final Pre-Installation Check

Before signing the contract, make sure you can confidently answer yes to these:

• The system has been designed around my electricity usage
• My future energy needs have been considered
• My roof and switchboard have been properly assessed
• I know the exact brands and models being installed
• I understand the proposed panel layout
• I have reviewed the total price and any finance costs
• I understand the available incentives
• I have checked the installer’s credentials and reputation
• I understand every warranty
• I know who will support the system after installation
• All promised inclusions are written into the contract
  

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Final Thoughts

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A well-designed solar system can reduce electricity costs and prepare your home for batteries, electric vehicles, and future electrification. Achieving these results depends on choosing the right equipment, system size, and installer.

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Take time to review your energy use, compare detailed quotes, and ask questions before committing. A trustworthy installer should explain every recommendation clearly, show how figures were calculated, and give you enough information to decide without pressure. Choose carefully to get the best long-term result.

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