Abstract:
This research presents a simulation and modeling analysis of a hybrid energy-based microgrid
system in Raya brewery factory, which integrates solar photovoltaic panels, biogas generators,
batteries, and converters. The system can meet full load of the company annual electricity demand,
with PV panels contributing 75% and biogas generator 25%. The study examines the performance
of a solar energy model in the Raya Brewery factory found in Mychew town of Ethiopia, using data
from sites like Raya Beer. The model estimated solar radiation values, with an average monthly
global radiation of 6.4 kWh/m2. From the total 1.12 MWh/day 75% (0.84MWh/day) is covered by
solar energy resources and the rest 25% (0.28MWh/day) is covered by the biomass sources of
power. The NMSA data reveals variations in solar radiation and energy measurements at the
Mychew station, indicating suitability for solar energy applications. The Raya Bear site's Total AH
needed per day requirements are 17,500 AH/day, with detailed calculations for an efficient and
sustainable system.
The numerical analysis of the stand-alone PV system design at Raya Bear site reveals a total daily
energy requirement of 840,000 WH/day which is 75% of the total energy demand, with a total
ampere-hour requirement of 26,250 AH/day. The system requires 312 PV panels and 156 modules
in parallel, with a battery capacity of 103,618.421 AH/day. The solar charge controller size is
4,036.032A, and the inverter capacity is 290.15001 KW. The economic analysis shows a simple
payback period of 13.8 years and an equity payback duration of 15.5 years, with the capital cost
being the largest expenditure. The financial analysis demonstrates a positive net present value
(NPV) and a reduction in CO2 emissions, contributing to environmental benefits. The biomass
hybrid system uses a 280-kW generator with a capital cost of $140,000. The proposed scenario
results in a significant reduction in greenhouse gas emissions from 9.7 tCO2/year to 1.8 tCO2/year.
