This will still only produce 12 volts. It will produce 1200 watts. watts is the result of Volts times Amps.
I'm not sure I understand your question. An alternator will have to produce 13 volts to charge a battery at 13 volts. Most alternators are able to produce 14+ volts but the range is 13.5 to about 15.5 volts.
13.5 to 15.5 volts.
Your car should produce about 14.4 volts from the alternator when the engine is running. If it does not produce anything over 12 volts, your alternator is not charging and you need to get it repaired or replaced.
It can put out too many volts and destroy the battery but not drain it. The alternator should put out between 13.5 to 16 volts.
13.5 to 15.5 volts
From 13.5 to 15.5 Volts.
13.5 to 16 volts DC.
From 13.5 to 16 volts.
Zero volts.
around 14-14.5 volts
it will not produce voltage or high enough voltage when running should be around 14 volts running