Printer powers down mid-print

I am attempting to print in my car from a Lenovo Thinkpad to HP Laserjet P1102w which is all being powered by a 1500 watt power converter that is hardwired to my car battery. However it will only print one page or less before the power converter loses all power and then reboots within 30 seconds. This continues to happen no matter what I do or if I only have printer plugged in. Ideas?!!
 
Laser printers use a lot of power, and 1500W is a lot to pull on an AC circuit converting from a car battery. I suspect that the voltage output of the car battery is dropping too low for the DC/AC conversion. Attach a voltmeter to your car battery and watch and see if it drops off during the printing task. Is the engine running (alternator replenishing the battery) at this time? They make car batteries and beefier alternators for people with high end stereo systems in their cars, you may have to go that route.
 
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