A battery with a 48V 200Ah capacity is required to be charged for approximately 9,600 hours. It would take a solar panel that produces 310 watts per hour to provide that much power in 5 hours. A solar panel must produce 9600 watts to get full charge at 0% SOC. However, you should not use a single solar panel at 0% SOC as this can be very damaging for the battery.