Light storage and standby shared battery power supply method and system

The invention relates to an optical storage and charging shared battery power supply method and system. The method comprises the following steps: acquiring a current power utilization load of power utilization equipment; if it is judged that grid-connected power supply is needed based on the current electrical load, current time information is obtained; judging whether the photovoltaic power generation module is allowed to merge generated electric energy into external commercial power based on the current time information; if yes, a first output switch of the photovoltaic power generation module is closed, so that the power generation electric energy of the photovoltaic power generation module is merged into external commercial power through a power supply bus, and the power supply bus is connected with electric equipment; and if not, closing a second output switch of the energy storage module, so that the stored electric energy of the energy storage module is merged into the external mains supply through the