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how many watts can a 12 volt battery produce

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None,watts is power used. Not power being put out.You have volts,amps, watts and resistance. Look up ohms law, may give you an idea.

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do you know if how much watts are in one volt
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If you gave me volt and watts, or volt and resistance, yes i can tell you how many amps using ohms law formulas.
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if you give me two pieces of the puzzle, I can figure out what you need. If you want watts, you have to give me volts and amps, or amps and resistance, or volts and resistance.
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I'm trying to figir how much much can a 900 watt car amplifier resisdicest to a 300 watt 3 way speacker
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Meaning you are going to be pushing 900 watts into 300 watts into speakers. Hear is the thing. Im an electrician but cars aren't my thing. Let me look something up, ill get right back to you. I have to crack one of my books.
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ok u ganna be a big help of projects I have to acomplish
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wait sorry I meant how many would a take for the 12 volt battery to use
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I don't think it's a good idea. And here is why. Amplifier amps up voltage and watt and amps. Its not like receptacle were you have nominal 120v. Then you hook something into it and the power being used is determined by the appliance. Lets say I had 100 watt light. What would happen if I hooked a 120 watt amplifier into it? It would blow up. Im not car guy, but amplifiers don't just make power available they pump it into. So, I say no. I think you will blow up your speakers.
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thanks I got it
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I think I just read you can hook up and run a 3000 watt amp while car is running to supply all the power you need. If that's all you need. Im not sure about the set up you just described though. 12v car battery will handle your 900w amp. Wouldn't suggest running it when car is off, drain battery quickly.
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ya id happen I'm just trying even the whole system
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12 man u just sed it in your queston.

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so twenty watts ok thanks i didn't even realize that
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12 I meant
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Read the previous answer, then mine, i think what you are looking for is how large of an inverter can you connect to a 12 volt battery, well, it depends on the source of power for that 12 volt battery, every battery is designed for so many volt hours, if you are charging with a solar panel, connected to a car alternator, or a wind generator, you will be limited by the charging rate, i often use a 1200 watt power inverter to power tools, i connect to 12 volt battery connected to 2 solar panels, i can run a small tv all day, or a power saw for 30 minutes, i hope this will give you an idea of what you are asking. If in a car, you can run 3000 watt inverter while the auto or truck is running to power just about whatever you want

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thanks ima need your help for the next projects
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