I studied electronics but became a programmer instead, and have forgotten a lot.
Now I need to run Arduinos and other 5 V boards in 12, 24 and sometimes 48 V marine and off grid environments, where the battery banks are always 6 V lead acid cells connected in series.
My circuits have to run as efficiently as possible when there is no charge on the batteries.
I would presume I will be using buck(/push?) converters to get a good regulated supply, and these all seem to get more efficient the less voltage they have to drop.
Is it possible or practical to take 6 V from the ground side cell directly?
Am I right to think this would be more efficient than bucking 12 V?
I need to be able to monitor the 12 V rail voltage as well, I hope using an ADC input, and I also need to control 12 V addressable LEDs, which are powered from the 12 V rail.
I cannot seem to find any discussion on this technique online, I presume there is a reason it will not work?