We ran all five on one house. Here is exactly what came back.

Three strings on this roof. All three drop out of MPPT range at some point in the year — and no fixed-condition calculator would have said so.

A string calculator evaluates one assumed worst-case moment. This evaluates the year: every hour, every month, on this roof's own shade and cell temperature.

Fire setbacks cost this roof 26 modules — about a third of everything that would otherwise fit.

Each plane's own pitch selects the rule. This roof has seven planes and they are not all the same, so a whole-roof assumption gets it wrong.

Seismic Design Category B. A prescriptive attachment schedule is fine here — and the tool says so rather than sending you to an engineer by default.

Design values come from the USGS ASCE 7 service for this exact coordinate, then bind to the array actually drawn: its weight, its coverage, and the steepest plane it sits on.

What it will not do: ASCE wind speeds and ground snow loads sit behind an account we do not hold, so LoadBind reports them as unavailable and tells you to look them up. A structural figure that is guessed is worse than one that is missing, because a missing one gets checked.

The imagery under this roof's shade study is 35 months old, and the roof is 31% obstructed. Both together mean: re-run it.

Age alone is not risk. An unobstructed roof carries an old basis safely, because nothing near it would change. An obstructed one is where a small change moves the answer.

This one is built and not yet switched on — and it says so instead of naming the biggest utility in the state and hoping.

Territories interleave. A municipal utility can serve three streets inside an investor-owned utility's county, and the interconnection limit moves with it. Resolving that needs a territory source we do not currently hold a key for.