If the PV array is wired for say the next higher nominal voltage than the battery, the MPP Voltage will always be above the battery voltage. However, in this case, all else being equal, and not taking PV to controller wire loss reduction into account, the controller will actually be less efficient than if its input voltage (PV) was lower. (closer to the battery voltage but higher than the battery voltage)
It's still typically better to wire the array for a higher voltage than the battery voltage and use an MPPT controller. This can help when the array is partially shaded too.
boB [ Parent ]
Mppt does ease the restrictions on the choice of panels. Things like using 3 panels for 24v become practical as long as the panels are the same current rating.
Flux[ Parent ]
