Has anyone else tested this for a period of time? Like 12 hours or so?

I saw on a wiki page (https://en.wikipedia.org/wiki/Fiat_5...at_500e_(2013)) that the Fiate 500e inverter is the "INVCON 2.3 by Bosch". I couldn't find the specs for the DC-DC power output max to the 12v battery.

I want to get a 1000w inverter, but just want to make sure that it doesn't prematurely drain the battery.