Should I get everything the installer promises verbally in writing?

Yes, always. Verbal promises about equipment, pricing, timelines, or performance aren't enforceable if a dispute arises later — anything that matters to your decision should appear in the written contract itself, not just in conversation.

Is it normal for a solar contract to be long and detailed?

Yes, solar contracts are often lengthy because they cover equipment specifications, financing terms, warranty details, and installation logistics. Length isn't itself a red flag — vagueness or evasiveness about specific terms within that length is the actual concern.

Can I negotiate terms in a solar contract?

Often yes, particularly around pricing, equipment upgrades, and timeline. It doesn't hurt to ask, especially if you have competing quotes to reference, though some standardized terms (like manufacturer warranty language) may not be negotiable since they come from the equipment maker, not the installer.

Questions to Ask Before Signing a Solar Contract

A solar contract is a significant, long-term commitment — asking the right questions before signing helps you avoid unpleasant surprises later. Here’s a practical checklist to work through with any installer.

Questions about equipment

What specific panel and inverter brands and models are included, not just general categories?
What is the system’s total rated capacity in kW, and how was that number calculated for my usage (see our sizing guide)?
Is this a string inverter or microinverter setup, and why was that choice made for my roof specifically?

Questions about pricing

What is the price per watt, and how does that compare to typical cost factors for a system like mine?
Is the 30% federal tax credit already reflected in this price, or is it separate — and am I actually eligible to claim it?
Are there any additional fees not included in this quote — permitting, inspection, utility interconnection application fees?
What happens if the actual installation costs more than quoted — is this a fixed price or an estimate?

Questions about financing

If I’m financing, what is the full amortized cost including interest, not just the monthly payment (see our financing comparison)?
If this is a lease or PPA, what happens if I sell my home before the term ends?
Are there any escalator clauses in a lease or PPA that increase payments over time, and by how much?

Questions about warranties

What are the specific performance, product, and workmanship warranty terms, in writing (see our warranties guide)?
Is the workmanship warranty transferable if I sell my home?
What voids any of these warranties — are there maintenance requirements I need to follow?

Questions about timeline and process

What is the realistic timeline from signing to permission to operate, including permitting and utility interconnection?
Who handles the permitting and utility interconnection paperwork — the installer, or am I responsible for any of it?
What happens if there are delays — is there any protection for me if the project takes significantly longer than estimated?

Questions about cancellation

What is the cancellation window after signing, and what does it require on my part?
Are there cancellation fees if I need to cancel after that window for a legitimate reason?

A note on red flags during this conversation

Watch for vague, evasive, or deflecting answers to any of these direct questions — a legitimate installer should be able to answer clearly and in writing. See our guide on solar sales scams and red flags for more on the specific patterns to watch for.

Bottom line

Working through this list with any installer before signing takes an hour of your time and can save you from years of frustration over a poorly understood contract. If an installer can’t or won’t answer these questions clearly, treat that as meaningful information about how the rest of the relationship might go, and don’t hesitate to walk away and compare against other quotes.