RoboSavvy Forum

Help with battery

2012-06-26T22:33:51+01:00

So 2 65ah 12v lead acid batteries wired in series would be plenty to run the whole rig and also am not worried about the weight but thanks alot

Statistics: Posted by CharlesVjr — Tue Jun 26, 2012 10:33 pm

Help with battery

2012-06-25T17:02:50+01:00

To use a rule of thumb, you can assume constant 3A on accessory motor, and giving you want a lot of speed changes, i will assume average will be around 125% of nominal current for drive motors.

So it will be 4hours*(3A+2motors*3A*1,25) = 42Ah at 24V

You should be able to get two standard 12V (in series) or one 24V car lead battery with that capacity. But it will be heavy.

Lipo's would be a better option but you would probably have to use several in parallel which is a bit tricky...

Regards

Statistics: Posted by MarcoP — Mon Jun 25, 2012 5:02 pm

Help with battery

2012-06-25T14:47:59+01:00

I would need the batteries to last 3-4 hours and there will be a lot of speed and direction changes on the 2 drive motors but constant on the one accessories motor

Statistics: Posted by CharlesVjr — Mon Jun 25, 2012 2:47 pm

Help with battery

2012-06-22T13:57:59+01:00

Hi

I think there are two main points you have to decide regarding the batteries:
Their maximum current output and capacity.

Assuming you have all 3 motors running that would be 9A current. However stall current for the motors (what it draws when starting from a stopped position) is much higher.
So if you want good acceleration you will need much higher current batteries.

Regarding capacity, it also depends on the use. How long do you want the battery to last? Are you going to be running it at constant speeds or lot of speed changes?

Without knowing that data it's hard to recommend an adequate battery.

Rgds

Statistics: Posted by MarcoP — Fri Jun 22, 2012 1:57 pm

Help with battery

2012-06-21T15:02:41+01:00

I am building a robot using 3 24v 3amp wheelchair motors one will need to run full time for an accessory and the other 2 will drive the bot tank style I was wondering what would be a good choice of battery to power the whole rig it will weigh around 600-800 lbs

Statistics: Posted by CharlesVjr — Thu Jun 21, 2012 3:02 pm