Start by separating the roof covering, electricity generation and energy storage. A proposal can combine them, but it should explain the scope, performance assumptions and service responsibilities of each.
Conventional rooftop panels
A conventional solar array uses generating modules mounted above a separate roof covering. It lets the roofing and electrical systems remain distinct, although their installation and maintenance still need coordination.
Evaluate the proposed roof layout, mounting details and generation estimate. Ask what access or roof work will be needed later, how visible equipment is positioned, and which costs are included beyond the modules themselves.
Start here if: your roof appears to have substantial life left and you want to understand whether solar can be added without a full roof replacement. Confirm that condition through an assessment.
Solar shingles and tiles
Integrated solar roofing uses generating components as part of the building’s roof system. Product designs vary, so terms such as “tile,” “shingle” and “solar roof” should lead to a specification sheet rather than assumptions about appearance or performance.
Ask how much of the roof is active, what covers the remaining area, and which components can be replaced separately. Establish who is responsible for weatherproofing and who services the electrical system.
Start here if: you are already evaluating major roof work and want to compare a combined roof-and-generation project with a new conventional roof plus panels.
Cool roofing is a different function
A cool roof manages heat through its surface properties, including how much sunlight it reflects and how readily it releases absorbed heat. That is different from generating electricity with photovoltaic cells.
These functions can be considered in the same roofing project, but the word “cool” does not establish solar output or a particular energy saving. Climate, building design and material selection affect the result. The Department of Energy’s 2021 consumer guide explains the physical principles; use current local requirements for code questions.
Historical Redwood material discussed solar and reflective roofing together. Evaluate any current proposal using its actual product specifications, rather than carrying forward the old site’s performance claims.
Inverters and controls
Photovoltaic cells produce direct-current electricity. An inverter provides the conversion needed for typical household alternating-current use. It is part of a system whose compatibility, placement and service arrangements matter as much as the headline module choice.
Ask which inverter architecture is proposed, what monitoring is included and how faults are diagnosed. If future storage is a goal, request written compatibility details instead of relying on the phrase “battery ready.”
We do not rank inverter brands here. Their suitability depends on the actual layout, product combination and operating requirements.
Battery storage
A battery stores energy for later use. It can be part of a strategy for shifting energy use, supporting selected loads during outages, or both. Those functions have different design requirements and should be priced clearly.
Compare usable energy, continuous and starting output, backup configuration, operating reserve and service coverage. A capacity number alone does not establish what the home can run.
A comparison that stays useful
Use a common checklist for every proposal: roof condition, included work, production estimate, utility assumptions, backup scope, cash and financed prices, and repair responsibilities. Note unknowns as questions rather than filling them with a generic statewide average.
Redwood does not sell the technologies on this page or claim to have tested individual products. These are category explanations to help you evaluate proposals.
Looking for the original Redwood products?
This address previously described the former Redwood Renewables company’s solar roofing concepts. The present page is an educational technology guide and does not advertise those historical products as available.
The original archived presentation (16-page PDF) is retained for reference. Its historical product specifications, contacts, warranties and incentive claims are not current offers from this publication.
Sources & scope
Product performance, site conditions and individual eligibility require their own verification.
- U.S. Department of Energy: From rooftops to building integration
- U.S. Department of Energy: Homeowner’s Guide to Solar
- U.S. Department of Energy: Solar and Resilience Basics
- U.S. Department of Energy: Consumer Guide to Cool Roofs (2021 PDF; physical principles only)
Solar roof or solar panels?
Start with the roof you have. Then compare the roof you need, the electricity you expect to produce, and who will service the system.