Khalim Conn-Kowlessar 5344bc8920 Slice S0380.44: SAP 10.2 Appendix M1 §3-4 PV β-factor calculator (no wiring) ... Pure-function module + 13 unit tests for the photovoltaic onsite/export split. No cascade wiring yet — Slices S0380.45..47 will wire β into the PE / CO2 / cost cascades respectively (which currently all over-credit the exported PV portion at the IMPORT factor). Module: `domain/sap10_calculator/worksheet/photovoltaic.py` - `PhotovoltaicSplit` frozen dataclass — monthly β + (E_PV,dw,m, E_PV,ex,m) with annual-sum properties matching worksheet line refs (233a) and (233b). - `pv_beta_coefficients(Cbat)` — three coefficients keyed on battery capacity (kWh), capped at 15 per §3c: CPV1 = 1.610 - 0.0973 × Cbat CPV2 = 0.415 - 0.00776 × Cbat CPV3 = 0.511 + 0.0866 × Cbat - `pv_split_monthly(epv, dpv, battery_kwh)` — per §3d-4: R_PV,m = E_PV,m / D_PV,m β_m = min(exp(-CPV1 × (R_PV,m × CPV2)^CPV3), D_PV,m / E_PV,m) E_PV,dw,m = E_PV,m × β_m; E_PV,ex,m = E_PV,m × (1 - β_m) Edge cases (not in spec but implied by physics): - E_PV,m = 0 → β = 0; both onsite and exported = 0 - D_PV,m = 0 → cap forces β = 0; all PV exports Unit-test coverage (13 tests, AAA convention, `abs(diff) <= tol`): - β coefficient constants at Cbat=0, 5 (ASHP cohort), 15 (cap) - Cbat>15 clamps to 15; Cbat<0 clamps to 0 (defensive) - Hand-computed β worked example (no battery): β≈0.4864 at E_PV=100, D_PV=200 — pinned at 1e-7 against precomputed value AND at 1e-9 against the live formula recomputation (load-bearing math pin) - Edge cases: E_PV=0 → no split; D_PV=0 → full export - Battery monotonicity: β increases with Cbat for fixed (E_PV, D_PV) - Energy conservation: E_PV,dw + E_PV,ex = E_PV per month + annually - Tuple length validation (raises on != 12 months) - Return shape pinned to `PhotovoltaicSplit` dataclass contract Test suite: 750 → 763 pass + 0 fail. Pyright net-zero on new files. Spec citation: SAP 10.2 specification Appendix M1 §3-4 (p.93-94). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-28 18:11:56 +00:00
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addresses	get rid of comments	2026-05-20 13:21:11 +00:00
sap10_calculator	Slice S0380.44: SAP 10.2 Appendix M1 §3-4 PV β-factor calculator (no wiring)	2026-05-28 18:11:56 +00:00
sap10_ml	Slice S0380.26: RdSAP10 §5.8 dry-lining adjustment on alt walls — closes cert 7700 -0.44 → +5e-5	2026-05-28 10:56:11 +00:00
tasks	added postcode splitter rewrite to ddd	2026-05-19 16:35:09 +00:00
postcode.py	get rid of comments	2026-05-20 13:21:11 +00:00