Asked — Edited
Resolved by Rich!
Need to figure out the current draw of the ez-b v4 with 1 heavy duty servo and 3 ping sensors.
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It'll also depend on the sensors you use, there are many "ping sensors" available. The HCSR04 is the one EZ-Robot stock, it's current draw is in it's datasheet which is available all over the internet but also in the datasheet repository I'm slowly putting together.
The current draw of the EZ-B V4 is going to be an unknown to all but EZ-Robot and I am sure they have had more important things to do than measure the current draw. It wont be much.
All of this you should already know, I have deliberately not given the current draw of the HCSR04 despite having the users manual open in front of me. The more you can learn to do yourself the better your experience will be
3.Ez-b v4: ?
With servos, if heavy duty I always allow for 2.5A stall current if I can't find anything on the servo, that should cover you.
One thing you could do, which is something I've started to do is throw in a current monitor. Adafruit make some which go in line with whatever you want to measure. I put mine between the battery and everything else. Hook it up to an ADC, run the bot on a temporary supply to measure the max current. I'll post a link when I get chance but have loads to do now, someone just left a load of presents under my tree!..
Run a script which records the highest value...
Check the datasheet for the ping sensors, they are 15mA each. 3 x 15mA = 45mA. So yes, it should work off of a 2A supply.