set key outside bottom
set key box
set terminal png
set output 'pv.png'
set xdata time
set timefmt "%b %d %H:%M:%S %Y"
set ylabel "Volts or Amps, Watts div 10"
set yrange [0:18]
set xrange [*:*]
set xlabel " "
set grid
set size 1.4 ,0.6
set key top left

plot '../solar/pooltemps.input' using 1:11 t "PV Voltage"      with l lc rgb "orange", \
     '../solar/pooltemps.input' using 1:12 t "Battery Voltage" with l lc rgb "red", \
     '../solar/pooltemps.input' using 1:13 t "PV Current"      with l lc rgb "green", \
     '../solar/pooltemps.input' using 1:($12 * $13 / 10) t "PV Watts div 10" with l lc rgb "blue"