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Within reason. The starter relay only carries 9 amps. Doghead's choice relay is already massive overkill. Any good quality 30 amp automotive relay will be just fine.

Make sure you replace all your battery cables with larger cables. (Yes, your ground cables, too.) Your engine will require the same amount of energy to turn it over whether the starter is 120v, 48v, 24v, or 12v. The load is the same regardless of the voltage used to drive the starter motor...