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simply won't keep up.  A 20 watt panel is fine on a bright sunny day if you
shift its position and angle several times during the day.  But I now use a
30 watt folding panel which has been adequate even on slightly overcast
days to keep the battery fully charged, and I don't have to worry about
moving it around all the time (I can just lay it flat on the ground rather
than trying to match the exact sun angle).  Of course if it was black-sky
stormy, don't expect to keep up, and if it is winter time, lying it flat on
the ground isn't a good choice given the low sun angles.

I've run the KX3 in contest mode for several long contests and the average
current draw over the entire contest has bee 300 mA (for 5 watts output).
 Bumping the power up to 10 watts brings that average drain to about 400 mA.

73, Bob, WB4SON