Orientation of Solar Panels - Optimum Performance

When an Installer has two strings (or more) with different orientations

For example: 1x string on an east roof plus 1x string on a west roof.

What is this the best way of connecting them into the Inverter MPPT’s?

When 2x strings are fed into a single MPPT, for maximum efficiency the strings should be balanced as best as possible. For an East / West split the MPPT would be limited by the lower generation of the two as the Sun traverses from east to west during the day. Therefore we would recommend the East string into one MMPT and the West string into the other MPPT.

Supporting Information - When using one MPPT tracker with 2 parallel strings the voltages of each string should be balanced no more than 5-10% difference on the voltage. This is because the MPPT does not read the strings separately. Having a large potential difference between the two parallel strings can also create a short circuit path from the lower voltage string through the higher voltage string limiting the current to the tracker. This essentially means you would be limited to the operating current of the lower voltage string on the MPPT.