Three appeals court judges on Wednesday grilled lawyers on both sides of a controversial California Public Utilities Commission decision issued last year that affects the 1.6 million customers who have installed rooftop solar on their homes and businesses across the state. “We have a lot of questions for you,” Presiding Justice of the California Court of Appeal Alison Tucher said at the start of the proceeding that lasted 1 hour and 15 minutes in the First Appellate District in San Francisco. At issue is a 5-0 vote the utilities commission, known as the CPUC for short, made that overhauled the…