Wires needed -

Total:

8 pin header with 2 lines for VOUT, GND?

S8B-PH-SM4-TB - put one of these on the back of each solar panel

note - VOUT and GND close together to decrease loop size. GND buffer between the I2C lines and power for increased isolation

1 3V3
2 5V
3 VOUT
4 VOUT
5 GND
6 GND
7 SCL
8 SDA

These wires will connect directly to the EPS board. 3V3, 5V, SCL, SDA are all global signals (on the PC-104 stack) so they can be connected on any board. VOUT needs to go directly to EPS to be the input to the MPPT system.