VIDEO: Fire investigators say the cause of the brush fire near Kapa’a Bypass Road was accidental. Investigators say that the fire was sparked by a photovoltaic panel being charged by a car battery. Officials say the fire burned 10 acres of grass. No injuries were reported, and no structures were threatened. The fire came just a day after another brush fire scorched 1,000 acres in West Kauai. That blaze was 100% contained.