my class is building a robot for capstone we have 2 24v dc motors being powered by 2 12vdc drill batteries wired in series to produce the 24 v.
what i need help with is to build a charging system that uses a 12vdc adapter and when it is plugged in switch the batteries from series to parallel in order for the battery paks to charge.
It's a standard DPDT (double-pole, double-throw) switch. Telling you where to buy it is difficult because you didn't put your location in your profile, but I would start with Digikey or Mouser.
It's a very standard type of switch, there are millions of options out there that would work.
A 12V battery needs a higher charging voltage of about 14V. From a 12V adapter?? No.
To charge a battery you must limit the current. Where is your current-limiting resistor?
It's a standard DPDT (double-pole, double-throw) switch. Telling you where to buy it is difficult because you didn't put your location in your profile, but I would start with Digikey or Mouser.
It's a very standard type of switch, there are millions of options out there that would work.
....
Good solution! Would be better if both 12VDC leads (sets) were separaded/isolated into two separate 12VDC - since I think the original poster wanted to charge the Two 12V batteries separately.
Just my 2.5 cents/worth....
Question about two batteries in parallel:
If you have two batteries running in series (24V) and they discharge slightly differently they might not have the same voltage when the "switch" is flipped and they are now in parallel. I am thinking about the spark when a 12V battery is connected across a 11V battery.
Is this a problem?