About WrapCalc Solar

Who this site is for

WrapCalc Solar is built for people buying or installing rooftop solar: homeowners comparing quotes, installers checking a design before it goes out, and contractors who need the assumptions behind a number to be visible.

Why it exists

Solar quotes run on numbers that are easy to get slightly wrong: how many panels a roof actually takes, what the system produces in year one, what it costs after the federal credit, how long payback takes, and what exported energy is really worth under your tariff. Small errors compound into oversized systems, weak payback, or savings that never arrive. This site exists to make those numbers checkable in minutes, with every assumption visible on the page.

What you will find here

• Calculators with visible math: every input, formula, and output is shown, so a result can be verified by hand or against code tables.
• Reference charts and rate baselines: national averages and typical values, always dated, always labeled as starting points rather than local facts.
• Practical guides: worked examples that pair a parameter table with a hand calculation you can reproduce, written so a first-time buyer can follow and a professional can skim.
• A private Workspace: save assumptions and reports for jobs, quotes, and comparisons without exposing client data.

How content is produced and reviewed

Each calculator ships with machine-checked test cases: fixed inputs must reproduce fixed outputs before the tool is published. Rate baselines carry a data year and are reviewed annually against U.S. Energy Information Administration figures. Guides cite their sources and show the full arithmetic of every worked example. When a reader reports an error through Contact, the page is corrected and the correction is noted.

What this site is not

WrapCalc Solar is a planning and reference tool. It is not a substitute for the National Electrical Code, the authority having jurisdiction, manufacturer instructions, or the judgment of a licensed solar designer or structural engineer on site. A calculator output is not an approval, a permit, a quote, or a guarantee of performance. Read the Disclosure before relying on any result.

Continue

Read the methodology · Read the disclosure · Contact the site