Convert a DC powered device to AC powered
#1
03-15-16, 10:06 AM
Convert a DC powered device to AC powered
I have a Ball Throwing machine that runs currently on 2 NPX-35 12V 35W batteris that are coupled together. I want to eliminat the Battery and run it directly from an AC wall jack. I tried using a standard AC to DC converted that converts to 12v, but the speed of the machine is way to slow, it's not getting enough power. Is it because it's using two 12V batteries coupled together, that I need more voltage? Should it be 24V? I'm not an electrical engineer, but I thought this would be a pretty simple project. Can anyone assist me?
Jim
Jim
#3
03-15-16, 10:25 AM
Group Moderator
You need to find out if your machine is operating at 12 volts (batteries wired in parallel) or 24 volts (batteries in series). If it's 24 volts then powering it with a 12 volt supply would obviously make it run slow.
#4
03-15-16, 03:18 PM
Ok, it appears the batteries are couple in parallel, negative to negative, and positive to positive. I also found the following on a plate, two separate lines:
120 VAC, 60Hz 140W 10/10 min T1.25A
102 VAC, 50Hz 140W 10/10 min T0.75A
120 VAC, 60Hz 140W 10/10 min T1.25A
102 VAC, 50Hz 140W 10/10 min T0.75A
#5
03-15-16, 04:17 PM
Group Moderator
I assume the VAC specs are for the charger. If you tried a power supply and the motor is running too slow I assume your supply is under sized.
#6
03-16-16, 06:29 AM
Okay, this is what I could find when looking at the machine, it appears the batteries are coupled in parallel, negative to negative, and positive to positive. I also found the following on a plate on the back of the machine, two separate lines:
120 VAC, 60Hz 140W 10/10 min T1.25A
102 VAC, 50Hz 140W 10/10 min T0.75A
So what kind of power converter should I be looking at to attain the same power being provided by this battery configuration.
120 VAC, 60Hz 140W 10/10 min T1.25A
102 VAC, 50Hz 140W 10/10 min T0.75A
So what kind of power converter should I be looking at to attain the same power being provided by this battery configuration.
#7
03-16-16, 04:24 PM
Group Moderator
You last post adds no new information as you said all that in your previous post.
The charger current has very little to do with what it takes to make the machine run. Just like how a 2 amp charger can charge your cars battery but not stand a chance of starting it. You need to find out how much the machine draws at 12 volts DC. It's probably not on a data plate so you'll have to do some investigating. Look at the motor(s) and see if they have any specs or a model number you can look up as the motor(s) is likely the larges current draw.
The charger current has very little to do with what it takes to make the machine run. Just like how a 2 amp charger can charge your cars battery but not stand a chance of starting it. You need to find out how much the machine draws at 12 volts DC. It's probably not on a data plate so you'll have to do some investigating. Look at the motor(s) and see if they have any specs or a model number you can look up as the motor(s) is likely the larges current draw.
#8
03-16-16, 09:45 PM
Group Moderator
Since that machine uses two 35AH batteries in parallel..... you're most likely going to need a hefty power supply. There are two styles available...... linear (uses a big transformer) or switching (uses high voltage switching).
There are many low cost 50A switching power supplies but many won't run high current motors. You may need a power supply like in the link below. This one is 50A and linear. They do make smaller ones which you may be able use.
Tripp-Lite-PR50-Supply-Output/dp/B00008W7SH
There are many low cost 50A switching power supplies but many won't run high current motors. You may need a power supply like in the link below. This one is 50A and linear. They do make smaller ones which you may be able use.
Tripp-Lite-PR50-Supply-Output/dp/B00008W7SH
