Really you are producing wattage for free.
Solar panel 12 or 24 volt.
12 volt panels usually contain 36 individual solar cells each cell at 0 5v comes at around 18 volt for the panel.
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Voltages above 24 are 24 volt panels.
Or 8 watts to 16 watts.
Renogy 2pcs 270 watt 24 volt solar panel 540w for off grid on grid large solar system residential commercial house cabin sheds rooftop multi panel solar arrays 4 2 out of 5 stars 108 solperk 30w 24v solar panel solar trickle charger solar battery charger and maintainer suitable for automotive motorcycle boat atv marine rv etc.
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Don t get upset because you are loosing wattage.
Alternatively you can tell this by physically seeing the panels.
This is so because increasing the voltage of a system causes a reduction in the current through it and in turn reduces the size of the wires you need.
This saves you losing voltage over a long cable from panels to converter.
The higher the voltage the less voltage drop you get on cabling.
Graeme says 24v has advantages.
4 7 out of 5 stars 37.
Any voltages above 12 volt and below 24 volt for a panel that is in full sun is a 12v panel.
You need 4 six volt batteries or two 12 volt batteries.
The solar panel puts out 6 6 amps at peak.
The reduction in wire size cuts down the costs as the thicker the wire the more costly it is.
The converter will use up from 5 to 10 of the 160 watts.