It would be too much just like that. Assuming your DC-DC converter keeps the 12V battery more or less topped off anyway.
You can do it, like if you like to run your stereo for lenghts of time engine off.
But you'd need a charge controller to protect the battery.
That thing also has leads to power something; if you hook up a fridge to that it would be disconnected when the battery gets low, so you can still start your car even though your sodas might be lukewarm.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
Last edited by RedDevil; 09-12-2014 at 05:49 AM..
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