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Can you post up a picture of your setup--the arduino UNO with the CAN shield, the power supply and wiring for the connection to the charger, etc. Also do you have a wiring diagram or schematic of how everything will be connected?

i would recommend that you load and run some of the basic example sketches with the UNO in order to learn a bit about how to communicate with it, then when it feels more comfortable you can add all the CAN stuff that you wish to do.

The basic task will be to write a string of characters thru pins on the UNO send out thru the CAN board to the charger.

You don't have to be an expert to run sketches, but you have to start with the easy stuff and work your way up. Fortunately there is a ton of information on their website and others on learning this stuff.
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