I have a APC Back-UPS-ES 350 device that charges a back up battery with 13.6 volts going to the battery. Problem is that when the battery is fully charged and the unit switches to battery the system goes into error because the input voltage is to high. For some reason the device doesn't want any more than 12.8 volts to function properly on battery. I mounted a limiting bulb to bleed off the over charge but have to leave it on all the time. I have thought about a diode in line with the source voltage that would limit the voltage from the battery back to the system. From old school and believe that a diode will act like a low resistance path in one direction but will limit the voltage in the reverse direction.
Am I wrong on this? Maybe its is an old mind dreaming of a simple fix? Any thoughts out there? Thanks
Am I wrong on this? Maybe its is an old mind dreaming of a simple fix? Any thoughts out there? Thanks