Fill the power budget with argued type-values (flagged as estimates
pending nameplate readings): about 5.5 kWh on a typical workshop day,
peaks under the MultiPlus 4 kW continuous with a no-laser-plus-CNC
usage rule, 2.3 days of battery autonomy without sun, winter covered
when the deck is deployed. The system bought before the bus turns out
coherent with the workshop it will power. Blog post tells the day the
label, the datasheets and the beam equations made the decisions.
First structural study of the awning mode, using section properties
measured on the actual C-beam STEP (I = 6.11e5 mm4 by numerical
integration). Verdict: a free cantilever fails at 80 km/h wind
(SF 0.89) while tip props turn four plain C-beams into a structure
that rides out 100 km/h at SF 2.6 — props are structural, not
optional. Baseline for the FEM stage: four C-beam crossmembers plus
two props; deployment procedure and wind fold-in rule recorded.
Comparative survey next to the V-SLOT lead so the trade-off survives
until the FEM stage: industrial T-slot and TIG-welded aluminium for
the frame, heavy-duty telescopic slides or gate-hardware steel
rollers for the motion, and the salvage lead of a truck sliding-roof
mechanism; precision linear guides ruled out for dust and water.
The owner proposes building the roof structure in V-SLOT extrusion,
which fits the house ecosystem and makes the V-groove itself the
sliding rail. Record it as the retained lead with its three guard
rails: vibration-proofed joints, weather-protected rolling interface,
and C-beam/4080 main beams sized by FreeCAD FEM for the deployed
cantilever. Positive mechanical travel lock stays independent.
Official manufacturer figures for the whole energy chain: US3000C
32.0 kg (bank 128), MultiPlus 30.0, MPPT 4.5, Fronius Primo 21.5
(the one estimate that was off, +5.5 kg), Cerbo ~0.4 (reseller value,
absent from Victron docs), LONGi panel 19.5 confirmed. Weight
tracker, architecture, roof concept and the decision entry all
updated; Fronius MPP window corrected to 80-800 V.
The LONGi label photo yields the exact model (LR4-60HPH-370M) and its
electrical figures. The voltages nearly settle the DC/AC split on
their own: ten panels in series reach 409 V, beyond the 250 V MPPT
ceiling but inside the Fronius MPP window, while the MPPT tops out at
five-panel strings. Fixed deck to MPPT as 2x5, sliding deck to
Fronius as 1x10, one conductor pair through the flexible link.
First numbered estimate for the solar roof: 20 LONGi 370 panels at
about 19.5 kg each plus fixed rails, the self-supporting sliding
frame (aluminium mandatory, steel would double it) and cabling land
around 650-700 kg. Recorded in the weight tracker and the roof
concept doc with the structural and centre-of-gravity implications.
Deep regulatory research (15+ official sources, RTI 03.8.3 sheet read
in full): the TCP-to-VASP procedure is nailed down (13-item dossier,
seat reduction handled inside it, 86.90 EUR), but two blocking
uncertainties surfaced. First-registration date may forbid the
conversion or require a ministerial derogation, and no firm text
covers the sliding solar deck. Both flagged as blocking questions in
parcours-vasp.md and solaire-toit.md: DREAL first, fabrication later.
Block-diagram the validated architecture as movable shapes and texts:
PV decks feeding MPPT (DC) and Fronius (AC-coupled), MultiPlus and
Pylontech bank on a highlighted 48V DC bus, P17 shore input, AC and
DC boards, Cerbo GX. Gives the electrical folios a reviewable
starting point instead of a blank page.
QElectroTech 0.100.1 is now installed locally, so the qet/ folder
gets its actual project file: five pre-named folios matching the
documented plan (synoptic, 48V DC, 230V AC, rooftop PV including the
sliding deck, monitoring/interlocks) with house title-block fields.
README updated from install instructions to open instructions.
Split the schematic tooling by audience: QElectroTech (IEC 60617,
versionable XML) for the 48V/230V/PV installation folios that
electricians and inspectors read, KiCad kept for in-house boards
(monitoring, solar-deck interlock). Seed qet/ with the folio plan
and conventions; record the decision.
L'électron rare