Bosun Lighting has been focusing on innovation for over 16 years in solar street light industrial. Thanks for all the effort from Bosun's R&D team member, today we are glad to inform you that we have updated our advanced technology in patent solar charge controller Double MPPT to Pro-Double MPPT at the beginning of 2021! The charging efficiency of our product now is 40-50% higher than the normal PWM solar charge controller in the market. Welcome to inquiry and order!