Throughout the entire lifecycle of electric vehicles, carbon emissions are generated from their manufacturing, usage, and disposal processes. To effectively harness the energy-saving and emission-reducing benefits of electric vehicles, this article focuses on the usage phase and proposes a charging guidance method that takes into account green electricity consumption. By integrating green electricity subsidies with time-of-use electricity pricing, users are guided to charge during the green electricity output period, maximizing the consumption of green electricity. Initially, we formulate green electricity subsidy prices for each time period based on photovoltaic output characteristics, encouraging users to switch from non-green to green electricity periods for charging through these subsidies. Subsequently, during the green electricity period, considering the total photovoltaic output constraints at different times, we provide charging guidance to users who need to charge. By optimizing the price at which green electricity operators sell green electricity to users through time-of-use pricing, we ensure the revenue of green electricity operators. The calculation results demonstrate that the proposed charging guidance method can effectively enhance the green electricity consumption capacity of electric vehicles and improve their carbon reduction effect during usage.