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3. Sizing of Hybrid PV/Batteries Bank/Diesel Generator System 267

Table 8.3 Number of Each Part Used per Room in the Investigated House
Living Guest
Part Bedroom Room Room Bathroom Kitchen Basement
Light bulbs 4 8 4 2 6 6
A/C 1 1 1 0 0 0
Mobile 1 0 2 0 0 0
TV 0 1 0 0 0 0
Fan 0 0 0 1 1 1
PC 1 1 0 0 0 0
Printer 0 1 0 0 0 0
Receiver 0 1 0 0 0 0
PS3 0 1 0 0 0 0
Chandeliers 0 0 2 0 0 0
Shaver 0 0 0 1 0 0
Water 0 0 0 1 0 0
heater
Refrigerator 0 0 0 0 1 0
Microwave 0 0 0 0 1 0
oven
Dish 0 0 0 0 1 0
washer
Blinder 0 0 0 0 1 0
Coffee 0 0 0 0 1 0
Maker
Washing 0 0 0 0 0 1
machine
Dryer 0 0 0 0 0 1
Vacuum 1 1 1 0 0 1
cleaner

in the renewable energy system taking into account the parts’ cost, maintenance
requirement of each part including replacement, lifetime of each component, and
the pollution produced by the DG. Thus, it is necessary to conduct an optimization
process to achieve the best system size for all parts used. The sizing problem in-
cludes finding the number of PV panels, the number of batteries, the DG output po-
wer, and the time of operating the DG.

3.2.1 Optimization Objective Functions
The objective function used in the optimization process is given by:
(8.16)
min c ¼ cost PV þ cost battery þ cost DG
The overall cost of the hybrid renewable energy system is composed of initial cost of
the system, replacement costs of PV panels and batteries during the system lifetime