Utilization of Rooftop Solar Units to Generate Electricity and Hydrogen: A Technoeconomic Analysis

Table 1

Technical and economic specifications of the components.

Component	Size/number	Lifetime (yr)	Capital cost	Replacement cost	O & M cost	Other characteristics
RSUs	8.2 (kW)	25	1,560 ($/kW)	1,530 ($/kW)	10 ($/kW.yr)	Electrical bus: AC; Derating factor: 96%; Temperature coefficient: -0.41 (%); Operating temperature: 45 (); Efficiency: 17.3%; Ground reflectance: 20%; Tracking system: no tracking
Converter	1 (kW)	15	600 ($/kW)	600 ($/kW)	10 ($/kW.yr)	Rectifier efficiency: 90%; Inverter efficiency: 95%; Rectifier relative capacity: 100%
Storage	1(#)	10	3,200 ($/#)	3,000 ($/#)	20 ($/#.yr)	Throughput: 80,000 (kWh); Nominal voltage: 240 (V); Nominal capacity: 8 (kWh); Nominal capacity: 33.3 (ah); Roundtrip efficiency: 86%; Maximum charge current: 15 (A); Maximum discharge current: 15 (A); Initial state of charge: 100%
Electrolyzer	1 (kW)	15	1,450 ($/kW)	1,450 ($/kW)	60 ($/kW.yr)	Electrical bus: DC; Efficiency: 85%; Minimum load ratio: 55%
Hydrogen tank	20 (kg)	25	120 ($/kg)	120 ($/kg)	5 ($/kg.yr)	Initial tank level: 0