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Probably like a 30-40 amp fuse... I don't know, electronics isn't really my field :roll:

I'm sure someone will chime in...
 

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Basic Physics DC Theory:
Power (in W) = Voltage (in V) X Current (in A)
P=VI
200W = 12V X I
I = 16.7A

20A fuse should do it.

BTW make sure your wires have enough guage to take that much current.
 

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i think for 16.7A, you'd need 12 or 14 AWG. i could check on it tomorrow. also, you should run a fuse slightly larger than your power consumption.
 
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