Hello
I am building a 12v system to power a cart full of audio gear that also has ups backup to lead acid. I am using a samlex 1235 power supply to create 14v which feeds all of the 12v audio gear and a samlex bbm 1225 which steps down the 14v to trickle charge the lead acid (33ah) and seamlessly connect the system to the battery if the power supply loses A/C input. Make sense?
Firstly, I want to be able to use two batteries and be able to 'hot swap' them. For example let's say 1 battery is connected and is being trickle charged. Then I connect a low battery. I don't want the dead battery to suck all the juice from the charged one, or from the rest of the system (if running off the batts,) yet I still want it to begin charging from the 13.5 volts from the power supply. Make sense?
Secondly, the audio gear can handle up to 16v. Problem is, I'm getting quite a voltage drop when feeding from the battery and not the 14v power supply. What can I do to make the transition from 14v to batt backup, so that my voltage suddenly doesn't drop from 14 to 11? I want to be able to run 15 to 20 amps of 12vdc from this 30amp power supply and a single OR pair of 33ah batteries (1 batt for shorter run time and less weight) and I want the voltage at the gear to stay around 13-14 Volts from 10 to 20 amps.