Can the facility run on solar — and when does it fail?
An 8,760-hour dispatch of the Module-02 load against a candidate PV array and battery, using Module-01 weather. The same engine sweeps the full PV × storage design space to find the zero-shortfall point.
Monthly failure profile
Worst week — hourly energy flows
Mean daily energy curve
Hourly shortfall heatmap
Design space — when does shortfall reach zero?
Methodology
pvlib PVWatts at 30° south-facing tilt, 14% system losses, hourly POA irradiance & cell temperature from the Module-01 TMYx file. No tracking; mono-Si modules at 200 W/m².
LFP chemistry, 92% round-trip efficiency, 90% depth-of-discharge, 150 kW power cap (independent of energy). Self-discharge negligible at hourly resolution.
Greedy hourly priority: PV serves load first; surplus charges the battery; deficit draws from the battery; residual is recorded as shortfall. No grid export, no curtailment penalty.
240–960 kWp × 300–3,600 kWh battery — 80 combinations, full 8,760 h re-run each. The zero-shortfall contour line is overlaid on the heatmap.
Outputs handed downstream
| Output | Goes to | How it is used |
|---|---|---|
| Sized PV (kWp) + battery (kWh) | Module 04 — Environmental Impact | Capital-goods stage: PV module + inverter + battery bill of materials |
| Grid import / export (MWh/yr) | Module 04 — Environmental Impact | Operational energy stage (PEFCR §5.3) — grid mix EF |
| Hourly dispatch baseline | Operate | Real-time deviation against measured PV + battery output |