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how long can a car battery run a 300 watt power inverter on full load?
if this works out and i get some good time i will use this when my power goes out to run my cable modem and router some lights and a small TV with a cable box and my laptop.
You need to Supply the power requirement of the equipment you intend to run and the power rating of the battery if you want a good answer. But a quick guess about 1-2 hours.
Ohmega Watts Full Swing