Choosing a Battery

[badtkee]

Originally Posted by Al Skierkiewicz

bad,
Some of the additional info we might need is...
1. terrain, is it flat, paved, uphill, etc.?
2. Is this outside with a wind component?
3. Is there any other electrical load other than two motors and controller?
4. What is the ambient temperature?
5. Is the payload in addition to robot structure?
6. Have you calculated out the transmission ratio needed to get 12" wheels running at 3 m/sec?
7. What would the target motor speed and torque be for that calculation?

1. the terrain will be mostly flat, an occasional incline, but nothing greater than like 5 degrees. It should run on grass, dirt road and gravel road

2. It will be outside so wind could be a factor.
3. I will be using an arduino board to control the robot, but if need be a different battery could be used to power the board
4. The average temp outside is around 65 degrees
5. the payload is in addition to the robot structure, I don't know how much the actual robot would weigh, but I'd guess it would be around 30 lbs (depending on what type of battery I end up needing)
6. The gear ratio that I calculated was 34:1 and I calculated the robot could then travel at 3.74m/sec
7. I did not calculate the speed of the motors, but I did find the torque to be 80.5 oz-in using the 34:1 gear ratio

And this project is for an internship, and my supervisor/mentor is on vacation for the next 2 weeks, so the plan is for it to be like a segway. It'd be a self-balancing robot.