It is about amps, just add them up. For items that tell you watts, divide the watts by 13.8 (this is a decent average voltage for a charging electrical system. Remember that the PTO draws power too if it is on. You should stay under the rating for the generator. IIRC, the starter/generator/VR setup is good for 25 amps. Someone correct me if I am wrong on the amp rating for the s/g.
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