I have four 12V batteries (all with the same watt-hour rating), and I would like to achieve dual voltages by interconnecting them, while achieving the following:
- 48V at the full amp-hour rating of the combined batteries.
- 12V at the full amp-hour rating of the combined batteries.
I am building a robot for my thesis and have the following constraints:
- Space limitations - I cannot put as many batteries as I want to achieve the high amp-hour ratings with multiple voltage levels.
- I have a 12V inverter (12Vdc to 120Vac) that is feeding 120Vac to my stepper drives - this means that I need lots of amp-hours as I can't run out of power after a short time. Essentially I need 12V with the full amp-hour rating of at least 2 batteries (connected at a single location - a true parallel).
- The 12V to 120Vac conversion is wasteful, and in general steppers are very wasteful as well, so I bought servos which are powered with 48Vdc - this means that I need 48Vdc at the full amp-hours of my battery bank.
Solutions that do not fly:
- Connecting the 4 batteries in series and grabbing a single 12 volt tap form one of the batteries to feed the inverter. This means that the 12V will have watt-hour ratings of only one of the batteries which will not be enough.
- The inverter takes only 12V. I cannot change the range of the voltage input to the inverter.
I am fresh out of ideas. I am hoping someone can think of a novel idea with connecting high watt diodes.
If I may provide any additional information please let me know.