A system comprising: at least one processor; and at least one non-transitory processor-readable storage medium communicatively coupled to the at least one processor, the at least one non-transitory processor-readable storage medium storing processor-executable instructions which when executed by the at least one processor, cause the at least one processor to: determine, for a first subset of vehicles, a first electrical characterization; and characterised by causing the at least one processor to: determine, for a second subset of vehicles different from the first subset of vehicles, a second electrical characterization; determine a difference between the first electrical characterization and the second electrical characterization; select a select subset of vehicles, wherein: the select subset of vehicles includes the first subset of vehicles; the select subset of vehicles includes the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is within a characterization threshold; and the select subset of vehicles does not include the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is not within the characterization threshold; and generate, based on electrical data representing vehicles of the select subset of vehicles, an electrical system metric which is indicative of electrical system performance of vehicles which correspond to vehicles in the select subset of vehicles. at least one processor; and at least one non-transitory processor-readable storage medium communicatively coupled to the at least one processor, the at least one non-transitory processor-readable storage medium storing processor-executable instructions which when executed by the at least one processor, cause the at least one processor to: determine, for a first subset of vehicles, a first electrical characterization; and characterised by causing the at least one processor to: determine, for a second subset of vehicles different from the first subset of vehicles, a second electrical characterization; determine a difference between the first electrical characterization and the second electrical characterization; select a select subset of vehicles, wherein: the select subset of vehicles includes the first subset of vehicles; the select subset of vehicles includes the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is within a characterization threshold; and the select subset of vehicles does not include the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is not within the characterization threshold; and determine, for a second subset of vehicles different from the first subset of vehicles, a second electrical characterization; determine a difference between the first electrical characterization and the second electrical characterization; select a select subset of vehicles, wherein: the select subset of vehicles includes the first subset of vehicles; the select subset of vehicles includes the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is within a characterization threshold; and the select subset of vehicles does not include the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is not within the characterization threshold; and the select subset of vehicles includes the first subset of vehicles; the select subset of vehicles includes the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is within a characterization threshold; and the select subset of vehicles does not include the second subset of vehicles if the difference between the first electrical characterization and the second electrical characterization is not within the characterization threshold; and generate, based on electrical data representing vehicles of the select subset of vehicles, an electrical system metric which is indicative of electrical system performance of vehicles which correspond to vehicles in the select subset of vehicles.