The room that the equipment is in, is not heated, so I made a simple electric heater that can run on the dc from the panels.
The 14 strings of 3 panels in series each, give me a nominal 130VDC to play with, so my 120VAC parabolic IR heater provides a nice load. I had to bypass the tilt switch,the on off switch, and the thermostat, so that the unit can safely run on the DC current. With the full sun, the 1KW heater runs nicely on just 2 of the strings as shown here.
The room is not very big, so I can easily get it to 70F in less than 1/2 hour.