Diseño y factibilidad financiera de una electrolinera residencial fotovoltaica con almacenamiento para respaldo doméstico en Metrópolis II.

Abstract

This study develops a residential photovoltaic EV charging and backup system for Metrópolis II using 9,135 kWh of annual household consumption, a daily driving distance of 65 km and a three-hour backup requirement. The design includes twenty-one 580 Wp modules, a 12.18 kWp PV array, a 10 kW class hybrid inverter, 10.24 kWh of LFP storage and a 32 A single-phase EVSE operating at 220 V. Roof occupation is checked against 62.47 m² with a 1.10 maintenance area factor. An hourly Python and pvlib model combines NASA POWER data with a design household load profile calibrated to monthly consumption. The normalized reference year yields 14,065.15 kWh while retaining physical grid imports and exports. Battery reserve is sized to supply up to 1.50 kW for three hours without solar production at 80% retained capacity. The reference project budget is USD 13,942.50 and the incremental investment relative to grid-based EV charging is USD 13,092.50. Over twenty years at an 8% real discount rate, NPV is −USD 1,618.72, IRR is 6.16% and simple payback is 12.90 years. Discounted payback is not achieved within the study horizon. Financial viability therefore requires lower investment or a lower opportunity rate and approval of the applicable SGDA energy-credit scheme.