[EricH]

There are a few other considerations you should have, too. Just to bring them to your attention:

1) Make sure there's a NEUTRAL mode so that the queuing staff or field reset can move your cart when you aren't driving it. Better, so that YOU can move it when the power fails!

2) SAFETY. SAFETY. SAFETY. Make sure it's a slow speed, can go over cable protectors without tipping or tipping the robot, has padding, dead-man switches, flashing lights while moving... Basically, make sure that you can be safe while moving through a crowd. That is, unless you like the safety inspectors removing your cart from the venue.

3) Batteries: Instead of running two batteries in parallel, which can be rather interesting to set up correctly so they'll work together, go with a 12v deep cycle battery. One of those should last longer than even two batteries in parallel.



There is a reason not to run them in parallel. I'll let the EEs like Al get into greater detail on why, or let you look at the other thread on batteries in parallel, but from what I understand, you pretty much have to charge them as a pair and discharge them as a pair, after balancing the two batteries. No suddenly pulling a battery out to use on the robot, no swapping, just use as a pair on the cart--unless you really want to go through the setup hassle again.