1 voltage meter for both solar panel and battery

[deannos]

Yes in this case the common goes to the meter (yellow wire) but the red wire will have to be energised from the battery because the solar panel may not be providing enough Voltage to drive the meter. The -ve on the solar panel will have to be connected to the battery -ve hope this helps you could of course put 2 meters on the system ..Clive

I did buy 2, be silly not to at that price