23.43 kW PV · 2 × SPI-12K-UPRO · 48 kWh LiFePO4 · zero export · 50 Hz
Three pages. The roof is where the power is made and where the strings and the earthing get decided. The wall is where it is turned into something the house can use. The buy list is what still has to be paid for.
Everything opens offline — no server, no build step, no internet beyond the web font, which falls back to a system font if it does not load.
Step one · on the roof
33 modules, four strings, five rail groups, and every cable on the roof.
Step two · in the plant room
Both inverters, the combiner, three battery cabinets, the switchgear and 35 cable runs, drawn to scale.
Step three · money
Every line, with what is paid for, what is sitting in the basket, and what is waiting on an answer.
CART.md, so it cannot driftOne 1¼″ cast-in chase, nine conductors. On the roof plan it leaves the junction box at the head of the access gap; on the wall plan it arrives at the DC SPD box, which is mounted directly under it so the surge path to the arresters is as short as it can be.
| In the chase | Roof plan calls it | Wall plan calls it |
|---|---|---|
| 8 × 4 mm² PV | four strings, two cores each, leaving the junction box | 4 STRINGS FROM ROOF → DC SPD box → four 2P-25 A breakers → four MPPTs |
| 1 × 16 mm² green/yellow | the whole bonding network, collapsed to one downlead | ARRAY BOND DOWN THE CHASE → main earth bar |
⚠ The chase position is still unconfirmed. It is drawn on the roof plan at the junction box because that is where it should be. If the plant room turns out to be somewhere else, every home-run length on the roof plan changes.