He present work aims to present and analyze the economic viability of a photovoltaic system connected to the grid with backup of lithium iron phosphate batteries, comparing with a photovoltaic system connected to the network without backup. It is noticed that there is a great disagreement on the part of the end consumers of low voltage towards the concessionaire, caused by problems in the poor energy quality provided to its customers, causing routine oscillations and voltage drop. In addition, it is mandatory that the photovoltaic generator connected to the grid disconnect seconds after any event that causes the grid to shut down, ie the anti-illusion is mandatory. In view of the above, a photovoltaic system connected to the grid with backup of lithium iron phosphate battery, of which the latter has 6,000 life cycles and a 10-year warranty, has a high performance and production when compared to stationary batteries. Therefore, the work simulated computationally by the software System Advisor model, cases and situations of which are possible to the implementation of a generator system with backup, analyzing the economic feasibility, with parameters of investment price, simple payback, discounted payback and net present value . The results obtained were economically viable, with low financial payback times, between 4 and 6 years, but with a high initial cost of investment when compared to the system connected to the network without backup, it was also verified that a generator with backup is more than twice the final value of a single system without backup, but when compared to the time of return on investment and energy security post system, such technology becomes attractive and a prospect for the near future.
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