AC watts vs DC watts – solar power question?

Is the formula for calculating watts for DC the same as for AC (Volts x amps = watts)?

I’m trying to figure out the details of a solar system. There is a company selling controllers that are rated for either 10 amps, 20 amps or 30 amps 12/24 volt DC. At 30 amps 12 volt DC you would only be getting 360 watts right?

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