3.1 Optimization Result:
HOMER did a total of 143,352 simulations and among them 126,288 were feasible. Among them the most feasible and cost effective five simulation results have been summarized in Table 10 . Here in this table the system optimization results have been shown that has been simulated by homer and has been ranked on the basis of COE and NPC.
From the result in Table 10 , it is seen that on the first choice wind turbine is not included. So it can be determined that for the location for the considered amount of load wind turbine is not economical.
The most feasible, optimized and economical combination for the site from the simulation is found to be a solar PV-battery-diesel generator hybrid system that has a NPC of USD 6,191 and a COE of 0.125 $/ kWh. Here the percentage of renewable energy to the overall generation is 82.5%. In this combination the total amount of diesel used by the generator in a year will be approx. 220 Liters. Here the solar PV supplies 3 kW and generator has 0.670 kW supply. We have 12 batteries in this system.
The second combination on the result table has wind-PV-battery-diesel generator all the three sources present. Here wind turbine is included so the NPC has become higher from the previous one. But this model has reduced amount of fuel used. This combination has a NPC of USD 10,696 and a COE of 0.216 $/ kWh. Here the percentage of renewable energy to the overall generation is 88.7%. In this combination the total amount of diesel used by the generator in a year will be reduced to approx. 143 Liters.
We have got higher NPC for diesel only system that is USD 19,038 and a huge amount of fuel usage of 1,235 L/year. The COE is also higher here and is about $.386/ kWh. Here renewable energy fraction is 0%.
Then the next model has only generator-battery based system. It has a NPC of USD 19,238. Here COE is $0.390/ kWh. The renewable energy fraction here is 0.0345%. The last combination we got is wind-generator-battery system has a total NPC of USD 19,997. Here COE is higher and is $.405 /kWh. The fraction for renewable energy here is 26.2%.