Auxiliary power units.
S.C. Code Ann. § 56-35-30
in effect(A) For the purposes of this chapter, operating an auxiliary power unit, generator set, or another mobile idling reduction technology as a means to heat, air condition, or provide electrical power, as an alternative to idling the main engine, does not constitute idling an engine. (B) For a vehicle equipped with an auxiliary power unit designed for idling reduction, the gross vehicle weight or axle weight used to determine the fine for a violation of commercial vehicle weight restrictions is the actual gross vehicle weight or axle weight reduced by five hundred fifty pounds.
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://www.scstatehouse.gov/code/t56c035.phpFetched: 10/17/2026