Abstract: In order to resovel the management problems of batteries and electrical appliances existing in the use of RV(Recreational Vehicle) . A kind of power management system of RV with raspberry PI 3B + as the main controller is designed. We design two parts of vehicle battery monitoring module and electrical appliance monitoring module. The battery monitoring module uses the battery-specific monitoring chip DS2438 to detect and manage the battery temperature, voltage and other on-board battery information, and to complete the status display and fault alarm prompt of single battery. The electrical monitoring module uses RN8209 chip to detect the electrical power of the electric appliance for the RV and to carry out intelligent management of the electric appliance through the main controller in time. The test results show that the system can accurately measure the relevant information of batteries and electrical appliances, and has certain practicability. And in view of the difficulty of traditional SOC ( State Of Charge) prediction, a modified AH
integration method is proposed, which fully considers the problem of battery capacity difference in actual use. The Matlab simulation results show that the method has high estimation precision and can be used for SOC estimation strategy.

Key words: recreational vehicle (RV) battery, battery monitoring, state of charge (SOC), electrical power