About a decade ago, Troy Van Beek used to lug around a solar panel to explain to potential customers that the technology, which still was relatively new at the time, can’t “steal sunlight.”“We seriously did that for a number of years,” recalled Van Beek, CEO of Fairfield-based Ideal Energy, “because there was just a complete misunderstanding or just a lack of education on it.”Now 11 years after the company’s founding, Ideal Energy is trying to sell another novel piece of renewable energy technology — green hydrogen.Green hydrogen, unlike the more common gray or blue hydrogen, is generated from renewable resources such as wind energy or solar energy.