There can be several things wrong.
As per s2krazyyy, you may have blown a fuse. Fuse locations are in your Owner's Manual (you can download a PDF from NissanUSA if you didn't get one with your Z).
You may have burnt out the alternator/regulator. You can check this with a voltmeter.
You may have damaged the ECM. No good way for you to check.
You may have burnt up some wiring. Check with a volt/ohmmeter.
As per cv129, it may be the battery. Put the battery on a charger and see if it will take and hold a charge.
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