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46bca47365
Slice 7 of the Solar PV Recommendation Generator (ADR-0026). Adds the composite per-dwelling Solar PV cost on the Products collection (ADR-0025 pattern): pv_system(kWp band, nearest of the ECOPV06-13 EA bands 1.0→4.5 kWp, floor/cap at the ends) + scaffolding(£900 first elevation + £450 each additional, default 2) + enabling base (EICR £150 + DNO £50 + 2-way consumer unit £330) + [diverter £980 if cylinder] + [battery if the with-battery variant] → Cost(total, contingency_rate 0.15). Rates are data in the committed solar_rates.json (Southern Housing "SOLAR PV & BATTERY" EA column), loaded via SolarRates.from_json/.default and injectable. The £2,000 / 5 kWh battery is NOT on the rate sheet — a flagged estimate (battery_estimate=true), confirmed with the user to stand in until a DB rate. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
"""Per-Measure-Type contingency rates.
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The one cost component carried separately from a Product's fully-loaded total
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(CONTEXT.md). Mirrors the legacy `recommendations/Costs.py::Costs.CONTINGENCIES`;
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extended as each measure type lands.
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"""
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_CONTINGENCY_RATES: dict[str, float] = {
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"cavity_wall_insulation": 0.10,
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"loft_insulation": 0.10,
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"sloping_ceiling_insulation": 0.10,
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"flat_roof_insulation": 0.10,
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"suspended_floor_insulation": 0.20,
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"solid_floor_insulation": 0.26,
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"mechanical_ventilation": 0.26,
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"external_wall_insulation": 0.26,
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"internal_wall_insulation": 0.26,
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"double_glazing": 0.15,
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"secondary_glazing": 0.15,
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"low_energy_lighting": 0.26,
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"high_heat_retention_storage_heaters": 0.10,
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"air_source_heat_pump": 0.25,
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"solar_pv": 0.15,
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}
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def contingency_rate(measure_type: str) -> float:
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"""Return the contingency rate for a Measure Type, raising if unknown
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(strict — do not silently default, per the repo's strict-raise convention)."""
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try:
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return _CONTINGENCY_RATES[measure_type]
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except KeyError as exc:
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raise ValueError(
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f"no contingency rate configured for measure type {measure_type!r}"
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) from exc
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