I am running a 200W panel through a 75/15 MPPT controller charging a 75Ah leisure battery. This system is used in a motor home and has been fine for over a year, however recently the battery is no longer charging. I have checked all fuses and connections and proven continuity in the wires from the panel to the controller.
My leisure battery reads 12.4V on a multimeter, however as can be seen in the attached image the controller states this to be 13.77. (Have I interpreted the screen correctly?).
I am also getting only 1W and 0A on a warm summer day in direct sunlight. The voltage stated in the image attached is 20.24V however when I put a voltmeter across the terminals on the controller I get nothing.
Also does the wattage display what power the solar panel can harness regardless of what charge the battery has. So even if I were to have a fully charged battery this would still display for example 130W in good weather?
