• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

trying to build a charging system

Thread starter #1
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.

any help would be greatly helpful.
 

colin55

Well-Known Member
#2
This circuit allows to you charge a 24v project from a 12v charger. It converts the two 12v batteries from series to parallel:
 

DerStrom8

Super Moderator
Most Helpful Member
#4
Where can i buy that switch and what is the name of it?
Hi Emilrudin,

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.
 

audioguru

Well-Known Member
Most Helpful Member
#5
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?
 
#6
Hi Emilrudin,

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.
Hi! I come from Sweden.
Sorry for bad english!

But I got 2 wheelchair motors 17.5 amp eatch. So i think i need a switch that coud hadle about 40 a?
 

ronsimpson

Well-Known Member
Most Helpful Member
#15
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?
 

Latest threads

EE World Online Articles

Loading

 
Top