I use the 30 watt flex solar panel here to keep an extra yellow top charged and power the engle 43 quart. The solar panel keeps the battery charged and powering the refer nearly full time. Last night we did a test of the output of the solar panel at night, with no moon, just a coleman lattern...when the lattern was close, the output was over 2 volts, amps not known. When the lantern was about ten feet away, output dropped to about .45 volts. In full sun, the output is around 23 volts.
Today I tested the output in full sun and got 22.8 volts at 1.98 amps....I know, 'it's a 30 watt panel'. Just reporting what it read.