Why Solar Quotes Are So Hard to Compare

If you have asked three solar companies to look at your Boston home, you probably have three proposals that barely resemble each other. One quotes a bigger system, one quotes different panels, and one leads with a monthly payment instead of a price. None of them are necessarily wrong. They are just answering different questions. Before you sign anything, it helps to put every proposal on the same footing so you can see what you are actually buying.

This guide walks through the parts of a solar quote that matter most for a Boston house, and the questions that separate a careful installer from a fast-talking one.

Start With System Size and Production, Not Price

Every proposal should state the system size in kilowatts and an estimate of how much electricity it will produce in a year, in kilowatt hours. Those two numbers are the foundation of everything else. A lower price on a smaller system is not a better deal, and a bigger system is not automatically the right one for your usage.

Pull a year of your electric bills and note your annual usage. Then check each proposal against it. Ask every installer the same question: what share of my annual usage will this system cover, and what assumptions are behind that estimate? Production estimates depend on your roof's direction, pitch, and shading, so two honest installers can reach different numbers for the same house. What you want to see is that the installer measured your roof and modeled your shading rather than guessing from an aerial photo alone.

Boston Roofs Come With Their Own Questions

Boston's housing stock is old by American standards. Triple deckers, gambrel roofs, flat rubber roofs, and slate all show up in the same neighborhood, and each one changes how a solar installation works. A flat roof may need a ballasted racking system. Slate requires a specialist and many installers will decline it. A steep, shaded street of mature trees can cut production more than homeowners expect.

Ask each installer two things about the roof itself. First, how old is the roof surface, and does it make sense to replace it before panels go on? Removing and reinstalling panels later to reroof adds real cost, so a roof near the end of its life is usually worth addressing first. Second, how will they flash and seal every penetration? A clear answer about waterproofing details is a good sign. A shrug is not.

Equipment and Warranties: Read Past the Brand Names

Proposals often lean on brand names, but the useful comparison is in the warranty terms. Look for three separate warranties and write them down side by side for each quote:

• The panel product warranty, which covers defects in the panels themselves.
• The performance warranty, which promises the panels will still produce a stated share of their original output after a set number of years.
• The workmanship warranty, which covers the installation, including roof penetrations and wiring.

The workmanship warranty is the one homeowners overlook and the one they most often need. It is only as good as the company behind it, so ask how long the installer has operated under its current name and who services warranty claims if they stop doing business locally.

Also note the inverter type. String inverters, microinverters, and power optimizers handle shade and monitoring differently, and they carry different warranty lengths. On a shaded Boston lot, the inverter choice can matter more than the panel choice.

Cash, Loan, or Lease: Know Which Deal You Are Reading

Some proposals quote a purchase price. Others quote a monthly payment for a loan, a lease, or a power purchase agreement. These are different products, and comparing a purchase price against a lease payment tells you very little.

If you are buying, with cash or a loan, you own the system, you claim any incentives yourself, and the panels are yours when the loan ends. If you are leasing or signing a power purchase agreement, the company owns the equipment, and you are buying the electricity or renting the hardware. Leases can make sense in some situations, but they complicate selling the house, because the buyer must accept the agreement. Ask every installer to state plainly which structure they are proposing, what happens at the end of the term, and what happens if you sell the home.

Incentives Change, So Verify Before You Count Them

Massachusetts has a history of supporting residential solar through state programs, and federal incentives have existed in various forms for years. The details change, and proposals are sometimes built on assumptions that are out of date by the time you sign. Do not accept a net price that quietly assumes incentives you have not confirmed. Ask each installer to show the gross price and then list each incentive separately, with its current status. If a claimed incentive matters to your decision, verify it with the program itself or with your utility before you rely on it.

Questions That Sort the Strong Bids From the Weak Ones

When you have proposals lined up, put the same short list of questions to every company:

1. Who pulls the permits and handles the utility interconnection paperwork, and how long is the current wait for approval to turn the system on?
2. Is the installation done by your own crew or subcontracted, and who do I call if there is a problem in year five?
3. What does the production monitoring look like, and will anyone besides me be watching it?
4. What happens if production falls short of the estimate?
5. Can you give me addresses of local installations similar to my roof?

Clear, specific answers are the pattern to look for. Any company that discourages you from comparing bids, pushes you to sign the same day, or will not put a claim in writing has answered a different question for you.

Take the Time the Decision Deserves

A solar array will sit on your roof for decades, through Boston winters, nor'easters, and summer heat. The gap between a careful installation and a sloppy one shows up slowly, in leaks, underproduction, and warranty fights. An extra week spent comparing quotes properly costs you almost nothing against that timeline.

If you are weighing solar for your home, get in touch with us. We will walk your roof, explain our numbers line by line, and give you a proposal you can compare with confidence.