What to compare on every quote
Focus on the details that change real costs and outcomes. Key items to compare: system size (estimated kilowatts), price per watt and total cost, modeled annual production and the assumptions behind it, the specific panel and inverter models, itemized labor and permit fees, expected timeline from permit to activation, and any maintenance or monitoring included. Also check exclusions: roof repairs, tree work, or upgrades to your electrical panel can add costs. Remember that price alone doesn’t tell you how much energy you’ll get or how long the installation will last — location, roof condition, shading, and installer skill matter.
Common tradeoffs installers make
Lower bids may use lower-cost panels, smaller inverters, or a leaner warranty and service package. Higher bids can reflect better equipment, more experienced crews, or a more thorough site prep — but they aren’t automatically the best value. National brands like Sunrun, Blue Raven Solar, or Freedom Forever can offer standardized processes and financing, while local installers may provide more hands-on workmanship and quicker responses. Warranties matter, but read the fine print: who backs the warranty, what it covers, and how claims are handled are as important as the length of the warranty.
How to standardize quotes so you can compare them
Ask each installer to base their proposal on the same assumptions: the same system size or a clear explanation if sizes differ, the same production estimate period and modeling method, and the same handling of permit and interconnection fees. Request itemized quotes with equipment make and model, design drawings or layout, and the expected production estimate with shading analysis. If one quote lists a generic inverter or 'equivalent' panel, ask for specifics. Get estimated start and completion dates, and a clear payment schedule. When you have comparable paperwork, differences in price and service become much easier to evaluate.
Steps to take before you request quotes
Gather a recent utility bill (12 months if possible), take a few roof photos from the ground, note roof age and any planned repairs, and check easements or HOA rules. Make a short list of priorities: lowest upfront cost, longest equipment warranty, or the best production estimate. Plan to get at least three written proposals and ask each installer for references and photos of recent local installs. During site visits, watch how they assess shading, roof condition, and attachment points — that inspection reveals as much about quality as the final price.