Every solar quote looks different — and most of them are hard to compare on purpose. This guide breaks down what should be in a solar proposal, what the numbers actually mean, and how to tell whether a quote reflects your home or just a sales target.
Solar Energy Guide
Understanding Solar Energy Quotes
Snapshot
Best for
Cost clairty
Reading time
8 min
Focus
Solar Quotes
Overview
At minimum, a quote should clearly list:
- Panel manufacturer and wattage
- Inverter type and quantity
- Total system size in kW (both DC and AC ratings)
- Estimated first-year production in kWh
- Installed cost before and after any applicable incentives
- Financing terms, if applicable, shown separately from system cost
- Net cost — what you actually pay out of pocket
If any of these are missing or bundled together in a way that's hard to parse, that's worth asking about before signing anything.
Key points
Cash Price vs. Financed Price
Always ask for the cash price first, even if you plan to finance. This is the baseline. Financing adds cost — sometimes a little, sometimes thousands — and some proposals bury those fees inside the system price so the markup isn't obvious.
When financing is presented, it should be broken out clearly: system cost, loan fees, interest rate, monthly payment, and total cost over the life of the loan. If a quote only shows a monthly number without the full picture, the math probably isn't in your favor.
The Two Cost Metrics That Matter
Cost per watt ($/W) is the most common metric you'll see. It divides total system cost by the system's DC capacity. It's useful for a rough comparison, but it doesn't account for differences in panel quality, degradation, or how much energy the system will actually produce on your specific roof.
Cost per kWh ($/kWh) is the better number. It factors in real-world production over time — not just capacity on paper. Two systems with the same wattage can produce very different amounts of energy depending on panel efficiency, inverter type, roof orientation, and shading. Cost per kWh reflects what you're actually paying for each unit of energy the system generates over its lifetime.
Equipment: What to Look For
1
Panels
Panel specs that matter most for Texas homes:
- Wattage — higher wattage panels mean fewer panels for the same output, which matters if roof space is limited
- Degradation rate — this is how much production drops each year. A panel rated at 0.25% annual degradation will still produce over 93% of its original output after 25 years. Cheaper panels degrade faster.
- Warranty — look for a 25-year power output guarantee and a manufacturer product warranty. Some manufacturers cover labor for replacements; budget brands typically don't.
2
Inverters
The two main options are string inverters and microinverters.
- Microinverters (one per panel) optimize each panel independently. If one panel is shaded or underperforming, the rest aren't dragged down. They also make it easier to monitor panel-level production and expand the system later.
- String inverters connect panels in series and are less expensive upfront. They work well on roofs with consistent sun exposure and no shading issues.
For most Texas installations, microinverters are the stronger long-term choice — especially on homes with complex roof lines, trees, or partial shading at different times of day.
3
Racking and Mounting
This is where some installers cut corners. Look for racking systems with long warranties and waterproof roof penetrations. Black-finished racking looks cleaner on most roofs than silver. Hidden end clamps give a more streamlined appearance.
If the quote doesn't specify the racking brand and model, ask. Some installers leave this vague so they can swap in cheaper hardware at install time.
Production Estimates
A production estimate should be based on your actual roof — not a regional average. That means accounting for roof pitch, orientation, shading from trees or neighboring structures, and local weather patterns.
Strong proposals include a first-year production guarantee. If the system underperforms that number, there should be a clear path to resolution. Be cautious of estimates that seem unusually high compared to other quotes — inflated projections are one of the most common issues in solar proposals.
Warranties and Installation Timeline
1
Panel manufacturer warranty
Covers defects and power output degradation
2
Inverter warranty
Typically runs 12–25 years depending on the brand
3
Installer workmanship warranty
Covers the installation itself — roof penetrations, wiring, mounting
How to Compare Quotes Side by Side
When you have two or three proposals in front of you, line these up:
- Total system size (DC and AC)
- Cash price and financed price shown separately
- Cost per watt and cost per kWh
- First-year production estimate — ideally guaranteed
- Panel brand, wattage, and degradation rate
- Inverter type and warranty length
- Racking brand and mounting details
- Warranty coverage — manufacturer, inverter, and workmanship
- Installation timeline after permit approval
- Add-on pricing broken out individually
Calculate your baseline consumption data
At its most basic level, there are three key numbers to know when evaluating how much of your electric usage can be covered by solar:
- your annual electric consumption (kWh)
- the estimated annual production of the proposed system (kWh)
- what percentage of your usage which will be covered by the proposed system
Jul 2024 - Jul 2025
A system with better panels, lower degradation, and stronger warranties will produce moreenergyand cost less to maintain over 25 years.
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