In the regions which are located far from the distribution
networks, using standalone microgrid to supply the power
demand with minimum cost and best reliability is essential.
Optimal sizing of Distributed Energy Resources (DERs) in
a typical microgrid is a complex multi-objective problem.
In this paper a multi-objective modelling for designing a
standalone microgrid with the best reliability and minimum
cost for supplying the load demand is investigated and
modelled. The proposed method is based on consumers
demand and their consumption patterns.Specification index
of proposed method is preventing from oversizing of
microgrid components.