See attached specs for the HP1020. Thanks.

 Electrical specifications
   *WARNING: * Power requirements are based on the country/region where the
printer is sold. Do not convert operating voltages. Doing so might damage
the printer and void the product warranty.
    110-volt models 230-volt models Power requirements 110-127v (+/-10%)

50/60 Hz (+/-2 Hz) 220v-240v (+/-10%)

50/60 Hz (+/-2 Hz) Rated current 3.5 amps 2.0 amps
 *Power consumption (average in watts) , *  Product model Printing Ready Off
HP LaserJet 1020 250 W 2 W 0 W
Power reported is the highest value measured for monochrome printing using
all standard voltages.
The default time from Ready mode to PowerSave mode and the recovery time
from PowerSave mode to the start of printing is negligible (less than
10 seconds) because of the instant-on fusing.
HP LaserJet 1020 speed is 14 ppm for A4 media and 15 ppm for letter media.
The heat dissipation in Ready mode is 20 BTU/hour.

On Fri, Jan 30, 2009 at 8:22 AM, Mike S <mikes@flatsurface.com> wrote:

> At 08:58 AM 1/30/2009, Michael Sullivan wrote...
>
>> Wondering if I can power my HP
>> 1020 printer with a off-brand 75W power inverter through the cig lighter.
>> I'm not an electrician, nor an exceptional mechanic(as seen by my previous
>> posts) and don't want to fry any electrical in the van. Feel free to
>> comment.
>>
>
> I'd worry more about the printer. Most cheap inverters have either square
> wave, or "modified sine wave" (which is nothing like a sine wave) output.
> Electronics aren't always happy with that. I can charge my laptop using one,
> but if I try to actually use it while plugged in, the trackpad goes crazy
> due to the noise.
>
> Check to see how many watts the printer draws before trying.
>
>

--
Michael in San Antonio
91GL AT 'Gringo'