The UFO X junction box accepts 9V to 28V (we rate the maximum at 27V allowing 1V for maximum range). The junction box provides 12V upto the UFO X so the amplifier in the UFO X is powered by 12V DC. So as long as your 24V charging system does not exceed 28V then it will work. If it does exceed 28V the junction box will simply turn OFF - the green light will go out and no power goes up to the Antenna. Once the voltage drops below 28V the junction box will power up again and send 12V upto the UFO X and it will work normally.