Solar
Most solar calculators exist to collect your phone number. These model the actual physics — sun position, atmosphere, the angle light strikes the glass, how hot the panels get — and publish how far they deviate from an independent reference.
Live now, and every figure on them comes from the same physics engine.
What a given array actually generates across a year, from sun geometry and atmospheric physics rather than a datasheet number multiplied by daylight hours.
Every tilt and bearing combination at once, as a yield surface, so the cost of the roof you actually have is visible rather than inferred one guess at a time.
What a system returns under real tariff and export terms, with the inverter replacement budgeted and exported energy valued separately from what you use yourself.
Hour-by-hour dispatch across a full year: what a battery actually saves, and why the returns flatten so sharply once it can absorb a typical sunny afternoon.
Cash, loan and lease reduced to one measure over one horizon — including who owns the panels at the end, which is the term leases are quietest about.
The full physics chain, every assumption, and how far the model deviates from PVGIS for each class of site — including the cases where it performs worst.
Market-neutral hardware questions. No tariffs, no incentives — physics and arithmetic that hold anywhere.
What DC:AC ratio is worth buying where you are — because the "1.2" everyone repeats is a sunny-climate rule, and a cloudy site wants a considerably smaller inverter.
What an inverter smaller than its array actually costs, month by month, and whether a bigger one would ever repay the difference.
What the rear face collects once you account for what is standing behind it — which on a flush pitched roof is very close to nothing.
Single-axis and dual-axis against a well-aimed fixed frame. The gain is mostly a question of latitude, and at some latitudes it is negative.
Whether cleaning pays for itself: dirt weighted by the generation it actually costs, against what a cleaner charges — and how often rain has already done the job.
Array, battery bank and controller sized on the worst month rather than the annual average, which is the mistake that leaves an off-grid site dark in December.
What a tree, a chimney or a ridgeline actually costs — direction by direction and month by month, rather than as the single annual percentage that hides when the shade falls.
What the unit means, the figure for your own plane rather than a horizontal table, and the watt, watt-hour and amp-hour conversions built on it.
Specified and validated, not yet built.
On the roadmap. Listed so the shape of the section is clear, not to imply they exist. Nothing sits here at present: everything specified has been built, and everything unbuilt is unbuilt for a stated reason rather than for want of time.