Usulan Peramalan Permintaan & Pengendalian Persediaan Bahan Baku Pada Produk Alternator di PT.XYZ

Abstract

PT. XYZ is engaged in manufacturing automotive products has products such as altenator and 
motor starter for automobile vehicles. The problem that exists in the company is experiencing a
shortage of products to sell or not being able to meet the demand for the number of products 
requested. The purpose of this study is to determine optimal production planning and raw 
material inventory control in order the company can minimize stock outages. The methods used 
in this study are moving average, weight moving average, and exponential smoothing for 
forecasting. As for raw material inventory control, it uses the economic order quantity, safety
stock, and reorder pointmethods. The results of this study obtained is weight moving average 
method n = 3, because it has the smallest error rate, namely with MAD of 5,364, MSE of 
39,447,784, and MAPE of 10.66%%. Meanwhile, raw material inventory control for 2022 
obtained by using economic order quantity method, achived by directly order 11,243units per 
year, with the number of orders every 55 times, then the total inventory cost is IDR 673,725,000. 
In the safety stock method for 2022, it is 3,564 units with a reorder point of 7,128.