COMPARING PROFITS OF INVESTING IN GRID-CONNECTED ROOFTOP PV SYSTEM AND DEPOSIT MONEY IN BANK USING DUAL INTEREST RATE

Abstract

This paper presents the effectiveness of investment between building a
rooftop solar power system and depositing money in the bank with a dual
interest rate system. The financial comparison is based on the actual design of a
rooftop solar power system, including batteries, to estimate the cost using PV
system software. With the amount of 302,935,000VND deposited to the bank
using dual interest rate, 1,822,819,513VND can be received after 25 years.
Meanwhile, investing in mentioned PV system could receive 3,149,210,058VND
during this period. The research introduces a very convenient calculation tool
that can be applied to any household by alternating its specific load data into the
available formula to calculate. The paper furthermore reports a numerical
example calculating on the house in District 9, Ho Chi Minh City, a tropical city in
an equatorial region with much potential for solar energy.