A solar quote is more than a total price. Two proposals can describe different system sizes, equipment, expected energy production, and installation work, so the lowest number may not represent the best fit for your home. Review each quote using the same checklist, and ask the installer to explain anything that is missing or unclear. A careful comparison helps you understand what you are buying, what work is included, and which assumptions could affect the final result.
Compare System Size and Production
Check the proposed system’s capacity, usually shown in kilowatts (kW), and the estimated annual electricity production, usually shown in kilowatt-hours (kWh). These figures are related but not interchangeable. A larger system does not automatically mean a better fit; its expected output depends on roof orientation, shading, panel placement, and other site conditions.
Ask what information the installer used to estimate production, including your electricity use, roof measurements, shading analysis, and local weather assumptions. Compare proposals that use the same recent utility bills and clearly state their assumptions. If one estimate is much higher, ask for the reason and whether it accounts for seasonal production and potential obstructions.
Review the Equipment List
Look for the panel manufacturer and model, the number of panels, and each panel’s rated output. Check the inverter type and model too. A quote may use string inverters, microinverters, or optimizers; each has different design and monitoring characteristics. Confirm that the listed components match the system layout and that any required electrical equipment is identified.
Ask whether monitoring is included and what it lets you see, such as system production or individual panel performance. Check the product warranties for panels, inverters, and other major components, and note who handles warranty claims. Compare the exact models rather than relying only on broad labels such as “premium” or “high efficiency.”
Check Installation Scope and Exclusions
Read the work description line by line. It should explain the planned panel layout, mounting approach, electrical connections, monitoring setup, and any work needed to connect the system to your home. Confirm whether the installer will arrange permits, inspections, utility coordination, and system commissioning, and ask who is responsible for each step.
Look for exclusions that could change the project or cost, such as electrical panel upgrades, roof repairs, tree trimming, or unexpected structural work. Ask how the installer handles discoveries made after work begins and whether you must approve added work before it proceeds. In Toronto, also confirm that the quote identifies any local approvals or utility steps relevant to your property.
Compare Price, Warranties, and Terms
Compare the total project price and the same cost categories across proposals. Check whether taxes, permits, installation, monitoring equipment, and any electrical upgrades are included. If a quote offers financing or incentives, separate those terms from the system price and verify eligibility and conditions directly; do not assume a projected credit or savings amount is guaranteed.
Review workmanship and roof-penetration warranties alongside the equipment warranties. Note how long each lasts, what it covers, and how to request service. Before signing, confirm the payment schedule, estimated timeline, cancellation terms, and process for handling delays or changes. Ask each installer to revise the quote if important details are missing, so you can compare proposals on equal terms.
The strongest solar quote is the one you can understand and compare—not simply the one with the lowest total. Use a checklist for system size, equipment, estimated production, included work, exclusions, warranties, and contract terms. Ask for written answers to open questions before committing. When you are ready, contact Toronto Solar Works to discuss your home and review a proposal.