Urgent building Robots help required

[heartpooh]

hi people, i'm new in building robots. i encounter some problems and wonder if anyone out there can help me or give me advice to it.

1) i need to size a battery (however wat does size a battery means)
    i have the payload (90kg), motor (120W x3), controller (300W) and it has to run continuous (4 hrS)
    how am i supposed to size the battery

2) anyone noes the difference between EPOS and EPOS2.

Thanks a million

[airman00]

Answers

1. Find out how many amps your motors draw in total. Lets say the total is 10 amp per hour draw, then you need a 10ah battery for it to last one hour continuous and a 40ah battery for it to last 4 hours continuous.  ( this does not take into account the electronics current draw)

What exactly are you building , some giant robot , 

2. Google search it for a while , it should probably answer you.

[heartpooh]

hi airman, thanks for ur advice. i'm actually building a navigational robot. i have no idea what it is. haha

[Admin]

Try out my energy calculator

http://www.societyofrobots.com/energy_calculator.shtml