Here is another kit with everything you need to build and program your own robot. The Magni has 2 x 200W hub motors and uses the Raspberry Pi 3 as its computer. Its battery lasts up to 8 hours but you can increase that to 24 hours with 32AH lead acid batteries.
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The robot has a max payload of 100kg. These robots are ROS Enabled. More info is available here.
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