This study evaluates the technical and economic strategies of a hybrid photovoltaic generation
system with a battery bank, operating under the grid-zero strategy, for a house with an energy
consumption of 49.89 kWh/d located in Manaus. This system aims to eliminate the injection of
excess energy into the electrical grid, complying with current legislation and mitigating
problems associated with the inversion of power flow, which occurs more frequently in larger
systems or with excessive penetration of photovoltaic solar generation. Using the HOMER Pro
software, simulations were performed to size the system components, evaluate its energy
efficiency and estimate financial indicators, such as Net Present Cost (NPC), Return on
Investment (ROI) and Payback. The results highlight the limited economic proposal of the
hybrid system due to the high initial costs of components such as hybrid inverters and batteries.
The system connected exclusively to the electrical grid presented the lowest NPC, of
R$183,461.00, and the lowest Levelized Cost of Energy (COE), of R$0.870/kWh, being the
most economical option. The inclusion of photovoltaic panels, with or without batteries, was
tested at higher NPCs, although it provided greater energy sustainability and a significant
renewable fraction, of up to 56.7%. The technical performance of the photovoltaic panels was
developed, with an annual production of 18,365 kWh and a levelized cost of R$0.138/kWh,
evidencing its efficiency in reducing dependence on the electrical grid. The battery bank,
configured with 7 units, demonstrated high energy efficiency, and the average cost of
R$0.451/kWh for stored energy, compromising its economic forecasts. It is concluded that,
although the hybrid system offers greater energy independence and environmental benefits, its
high initial cost and financial return limited its adoption in plans where economy is the
determining factor. It is recommended that public policies and financial incentives be
implemented to make hybrid technologies viable, aligning them with sustainability and energy
transition goals in Brazil.
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