BrightGridComparing solar installers should involve more than comparing the headline price. A cheaper quotation can contain a smaller system, different equipment, fewer services or different assumptions about generation and savings.
Questions about the system
- What exact panel model are you proposing?
- What is the total system capacity in kWp?
- How many panels will be installed?
- What inverter will be used?
- Is the system battery-ready?
- What battery would you recommend and why?
- How has shading been assessed?
Questions about savings
- What annual generation have you modelled?
- What electricity consumption have you assumed?
- What percentage of solar is expected to be self-consumed?
- What export income has been assumed?
- What electricity price assumptions have been used?
- How is payback calculated?
Questions about installation
- Who will carry out the installation?
- What electrical certification will be provided?
- How will the roof be protected?
- How will cables be routed?
- What happens if unexpected roof work is required?
Questions about warranties
- Panel product warranty
- Panel performance warranty
- Inverter warranty
- Battery warranty
- Installation workmanship warranty
Ask for the assumptions behind the savings
A credible quote should allow you to understand how the installer arrived at the projected generation, savings and payback.
Get a transparent solar proposal
Compare system design, equipment, generation assumptions and installation scope before making a decision.
Check Your SavingsFrequently asked questions
What should I ask a solar installer?
Ask about the exact equipment, system size, generation assumptions, shading, warranties, installation process, certification and projected savings.
Should I get multiple solar quotes?
Comparing multiple proposals can help you identify differences in system design, equipment and assumptions.
What should a solar quote include?
It should clearly describe the equipment, system size, installation scope, assumptions, warranties and relevant additional work.
Is the cheapest solar quote best?
Not necessarily. Compare the complete system, installation quality, warranties and expected generation rather than price alone.
Sarah Kimani
Systems Designer at BrightGrid Energy
