Scale is 3 pixels per meter.
Black is solar panels.
Green is a batbox.
Blue is an MFE.
White is an MFSU.
Pink is cable from solar panels to first batbox.
Red is copper cable.
Cyan is glass fibre cable.

This design is 3 tiered.  Each tier outputs downward, with the standard 2m separation.

The first tier is a small array of 32 solar panels and 1 batbox.  Cables go direct from the solar panels to the batbox.
The cable layout for this tier is on the layer "solar cables".

The second tier takes the output of 4 small arrays and combines it into one medium array, ending at an MFE.
Copper cable is used, with batboxes at the indicated places to prevent transmission loss.
The cable layout for this tier is on the layer "32 EU/t cable".

The third tier takes the output of 4 medium arrays and combines it into one large array, ending at an MFSU.
Glass fiber cable is used.
The cable layout for this tier is on the layer "128 EU/t cable".