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Highlights • A state of art of DC bus voltage for residential DC microgrid is addressed. • A survey of DC home appliances available on the market is performed as well as electrical safety in LVDC is addressed. • A performance comparison of some DC bus voltage level chosen for a small house case study is performed, followed by a financial analysis. Abstract This paper outlines a survey of DC bus voltage levels for standalone residential DC nanogrid. The DC bus, located between distributed generators and loads in DC nanogrid application, is generally chosen from existing experience and practices. A disparity of voltage levels is found in the literature due to lack of standardization, although some organizations actually deal with developing these standards. From this standpoint, this work proposes to present the elements to be taken into account in order to reach an adequate voltage level choice for a given application. User safety, efficiency and cost saving have to be ensured by this choice. Therefore, criteria based on power consumption, area of application deployment, cable size, line transmission losses are considered. The approach is applied to a small scale laboratory system with low power consumption and led to the choice of 48 V DC bus. [ABSTRACT FROM AUTHOR]