The true test of solar panels is amperage output against a low resistance or short circuit, not voltage output presumably on an open circuit.
Charlie
IIRC, the typical specs show max unloaded voltage output and max short circuit current. Much like batteries, solar panels have a theoretical optimum internal resistance that a maximum wattage can be developed on a resistor of the same value as the internal resistance. If the vendor has voltage and current curves with wattage you can pick out the point from their data. I think that they usually publish the max perfect Wattage for optimum conditions.
In the real world you'll have some sort of charge controller and some wiring resistance and a battery load with a certain charge state that are nowhere near the optimum load, so YMMV. That is one reason why you'll try to get a panel that delivers more current than a perfect situation requires. It also helps to make up for less than optimum sunlight due to pointing, sun angle and clouds.
Corey,
how did you measure the voltage? Was the panel connected to the charge controller? Would it be easy to insert the DVM as an Ampmeter?
For my setup I have a charge controller that can display Volts or Amps, similar to what the good folks at Adventure Trailers show at their web site.
I also searched around to find your Solar power thread
http://expeditionportal.com/forum/showthread.php?t=28712