SolarTI83 — Free Solar Tools & Calculators

solarTI-83

Free solar tools

Tools

Real-time solar azimuth & elevation, 3D sky dome, sunpath diagrams, and shadow analysis for any location on Earth.

Residential Solar

Estimate residential rooftop solar production using satellite imagery, real weather data, and panel layout tools.

Which seats and which parts of the field get sun for a game, on a 3D model of the stadium.

Tide times and heights for 3,400+ US stations. Click a station, get today's tide table and curve. That's it.

Guides

How much energy will my solar panels actually make?Where the kWh number on your solar quote comes from — sun position, irradiance, roof orientation, shade, panel temperature, and inverter clipping — and how to tell whether it’s real.18 min readRead the guide →Is solar a good investment? What it costs and what the power is worthWhat home solar costs at $3.36 a watt, what its power is worth under each state’s export rules, and how long it takes to pay back in ten states.12 min readRead the guide →Should you get a battery for your solar installation?A home battery saves money when evening power costs far more than midday exports earn. Modeled savings for 40 Bay Area homes under four export rules.15 min readRead the guide →Why west-facing solar panels fall further behind east-facing ones in north Florida than near PhoenixIn north Florida a west-facing roof plane gets about 5% less sunlight a year than an east-facing one and 11% less in summer; near Phoenix the gap is about 1%.8 min readRead the guide →When homes use electricity: hourly load by heating fuel and climateHow heating fuel, floor area and climate shape a home’s hourly electricity use, and why solar sized to a year’s use supplies only 33% to 50% of it directly.9 min readRead the guide →Why solar noon is rarely at 12:00, and which clock your solar data usesSolar noon in Boston, Detroit and Amarillo falls between 11:28 a.m. and 1:58 p.m. on the clock, and solar, load and rate data each follow their own clock.8 min readRead the guide →How tide predictions workA NOAA tide prediction is a sum of up to 37 cosine waves timed by the moon and sun and fitted to years of gauge data; five of them carry most of the tide.8 min readRead the guide →Which stadium seats get sun and which get shadeSeats go into shade when the sun is at their backs, so the direction a field points and the sun’s position at game time decide who sits in sun.9 min readRead the guide →