Abstract
Rosella is a flower with red and purple hue, having antioxidant pigments called anthocyanins, which is promising for health improvement. It actually could be potentially developed as a health-promoting food in the form of rosella jam. As the market for rosella jam in Indonesia is not established yet, and in the advent on the development of renewable energies in the 21st century, it is a fascinating idea to design a rosella jam factory employing solar energy as one of the renewable energies in the future that might lead the sustainable food business in Indonesia. The rosella jam factory is designed to produce 40000 bottles of rosella jam (weight: 250 g) per month, sold for Rp. 25000, rendering income of Rp. 1 billion per month. It needs a one-off capital cost of Rp. 2.56 billion for production equipments and machines (not including solar panels), with monthly manufacturing cost of 624 million (included 20 kW electricity) that will reach break-even point (BEP) at 13th month. Solar panels (mainly consists of 840 solar panels, 200 Wp working for 4 hours) worth of 2.64 billion is recommended to be installed on the 19th month to avoid negative cumulative net present value (CNPV).
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