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SAP 10.2 Table 12a Grid 1 (PDF p.191): secondary heating is a direct- acting electric room heater (RdSAP 10 §A.2.2 default), on the "Other systems including direct-acting electric" row — 7-hour high-rate fraction 1.00, 10-hour 0.50. A room heater runs on demand, mostly at the high rate; it does NOT earn the 100%-low-rate of overnight storage charging. `_secondary_fuel_cost_gbp_per_kwh` previously returned the flat off-peak LOW rate (5.50 p, £0.0550) for every off-peak electric secondary, under- charging by 9.79 p/kWh. New `_secondary_off_peak_rate_gbp_per_kwh` mirrors `_space_heating_fuel_cost_gbp_per_kwh`: it blends the Table 12a high-rate fraction (OTHER_DIRECT_ACTING_ELECTRIC) against the Table 32 high/low rates, with the 18-/24-hour fallback to the low rate. Simulated case 19 (electric storage main + electric secondary, Dual/7-hour meter) is the worksheet case (242): "Space heating - secondary (1.00*15.29 + 0.00*5.50)" → 15.29 p/kWh = £0.1529. This was the primary cat-7-cluster cost driver: total cost 1485.68 → 1835.53 (worksheet 1816.58), SAP cont 60.11 → 50.67 (worksheet ~51.22). Remaining +19 cost is HW/space-heating kWh (next slices). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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