摘要： This article describes a solar energy system, operating off-grid, having either a single photovoltaic panel - PV, or a group of multiple PVs, grouped in a simple solar battery-SB, directly supplying an electric battery-EB, or a group of EBs, having no DC-DC adapter (a buck, a boost or a combination of them, a classic solution available on the market). That SB must be adjusted to the voltage of the EB, in order to supply the same amount of electric energy as when the system functions at its mathematically detected maximum power operating point, on a MPP command strategy. This newly discussed technical solution could be less expensive, compared to the actual one which involves a SB, a DC-DC converter and the EB. It is a cost reduction because that DC-DC converter is no longer used at all. It requires a computer aided model for implementing the current-voltage characteristics. The results of this model will be compared with the classic DC-DC converter solution results, in order to prove validity.