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.
L'électron rare