What a complete quote should include
A thorough quote should give you more than a single bottom-line price. Expect an itemized breakdown with system size (kW), estimated annual production (kWh), and the exact equipment being proposed: panel model, inverter type, and racking. The price section should separate equipment, labor, permits, interconnection fees, and any removal or roof work. Look for assumptions used in the production estimate—roof tilt, orientation, shading, and expected degradation rate. The quote should state who handles permits and utility interconnection, show a clear timeline from permit to commissioning, and spell out manufacturer and installer warranties (name the manufacturers). Finally, ask for monitoring details and a service plan so you know how performance and maintenance are handled.
How to compare quotes apples to apples
Ask each installer to use the same basic assumptions so you’re comparing like with like. That means the same system size or the same target annual production, the same utility rate or escalation assumption, and the same roof constraints. Compare price on a per-watt basis and on expected dollars per annual kWh produced—not just the sticker price. Check the exact panel and inverter models; two panels with similar wattage can have different efficiency, degradation expectations, and warranties. Note inverter type: string inverters, microinverters, and power optimizers have different failure modes and replacement costs. If you see big differences in estimated production, ask for the shading analysis and the modeling inputs. Sample installers you might see in your area include Sunrun, Freedom Forever, or ION Solar—their proposals can vary, so treat brand names as one data point among many.
Tradeoffs and red flags to watch for
Lowest price often means tradeoffs somewhere: cheaper equipment, shorter installer warranty, or a less experienced crew. Important tradeoffs include equipment quality versus upfront cost, and a fast installation versus careful roof work or routing. Red flags: vague production numbers without supporting assumptions, no itemized cost breakdown, unclear warranty ownership (manufacturer vs installer), and pressure to sign quickly. Also be cautious if a quote omits who is responsible for permit delays, utility fees, or any future roof repairs around penetrations. Get references and look for local reviews—an installer’s track record matters as much as the hardware.
Next steps before signing
Use a short checklist before you commit: get at least two or three itemized quotes and confirm they use the same assumptions; verify licensure, insurance, and local permits; ask for recent local references and examples of completed projects; confirm how roof penetrations are sealed and who is responsible for future roof work; review both manufacturer and installer warranty language and who services the system if problems arise; and clarify payment structure and who handles the utility interconnection paperwork. If financing is involved, ask for the total cost under each financing choice and compare those scenarios side by side. Finally, get the installation timeline in writing so you know when work will start and when the system will be energized.