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If you pull 750 watts at 12 volts you are drawing 62.5 amps.
Your battery should handle this.
You can look at your alternator to see what it's output is ... it should be written on it somewhere.
If it's more than 60 amps when the vehicle is running you're good to go. If it's less, you will eventually drain the battery as you are drawing more than the alternator can supply.
A lot of the newer alternators do not respond to higher RPMs like the old one's did and maintain a pretty level output when idling or when the engine RPMs are higher.
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