The transition to the electrification of construction vehicles represents a pivotal shift toward greater sustainability in industrial practices. However, it introduces significant challenges to the electrical power grid and local distribution networks, as electrifying these vehicles induces high charging demand. This study assesses the impact of the grid integration of electric construction vehicles in the presence of renewable energy sources (RES), such as solar photovoltaics and wind power. The comparison is made between opportunistic charging and smart charging strategies with optimized local renewable utilization as the objective. The case studies are based on conditions of a city in central Sweden. Multiple seasonal operational scenarios are analyzed. The study evaluates key parameters for system performance, including peak load variations and renewable load matching, quantified by self-consumption and self-sufficiency ratios, as well as their balance. The results show that smart charging strategies can significantly reduce peak load. In the winter week case study, the average net peak load is reduced from 500 kW under opportunistic charging to 85 kW with smart charging. The performance of load matching improves from around 55% with opportunistic charging to around 95% with smart charging. The findings offer practical insights for construction site operators, distribution system operators, and transmission system operators, aiming to support electrification efforts while improving grid stability and sustainability.