Requirements

What the library holds itself to. The code and the other pages cite them by number (R-7).

• R-1: Per slot. Values are given per time slot over a forward horizon, slot by slot, so a scheduler can compare the slots of the next two days (The marginal price).
• R-2: Values by source. For every slot, what one more kWh costs, and what a PV kWh and a battery kWh are worth to a flexible load. A PV kWh is worth what it would have done without the load: exported, stored in the battery with headroom, or spilled (The marginal price).
• R-3: Each value says why. A PV kWh's value carries the routing it assumed; a battery kWh's carries what it is bought back with (What a stored kWh is worth, The make-up rule).
• R-4: A value now. Between valuations, the current slot's values follow the meters (The live value).
• R-5: Marginal, not average. Values are for one more kWh. The supply stack says how large a load can be before the price it pays changes (The marginal price).
• R-6: A pessimistic case. Beside the expected case, values for a dull day (the PV forecast's p10), whose surplus is never above the expected one (PV scenarios and certainty).
• R-7: Degrade conservatively. A missing or stale input moves values toward the import price and is named in degraded; a stale value is never reused (Missing and stale inputs).
• R-8: Prices are an input. Import and export prices per interval come in as a series, from any source (Scope).
• R-9: The load forecast is an input. The house's load as forecast comes in as a series, from any source, every load in it (Scope).