These are the settings and calculations I used for this design. I'll add some documentation in the future once I have the boards in hand and can test its features.

Maximum Power Point Tracking (MPPT)
Formula: MPP = R2/(R1+R2)

> Find the solar cell specs
               Voc = 5.53V
               Vpmpp = 4.46V

> Calculate MPP
               MPP% = Voc/Vpmpp = 80.6%

> Determine the resistor divider
               R1+R2 = 18MΩ to 22MΩ
               R2 = 16.9MΩ
               R1 = R2/MPP-R2 = 4.05
               R1 = 4.02MΩ

> Recalculate expected MPP
               MPP = R2/(R1+R2) = 80.8%
               *Ignoring R tolerance*

Battery Undervoltage Protection
Formula: VBAT_UV = VBIAS(1+R3/R4)

> Desired Undervoltage
               VBAT_UV = 3.2V

> Determine Resistor Divider
               R3+R4 = 9MΩ to 11MΩ
               VBIAS = 1.21V to 1.27V
               VBias = 1.25V (typ)
               R3/R4 = VBAT_UV/VBIAS(min)-1 = 1.64
               R4 = 4.02MΩ
               R3 = 6.61MΩ = 6.49MΩ

> Recalculate
               VBAT_UV = 3.16V to 3.32V
               *Ignoring R tolerance*

Battery Overvoltage Protection
Formula: VBAT_OV = 1.5*VBIAS(1+R6/R7)

> Desired Overvoltage
               VBAT_OV = 4.1V

> Determine Resistor Divider
               R3+R4 = 9MΩ to 11MΩ
               VBIAS = 1.21V to 1.27V
               VBias = 1.25V (typ)
               R6/R7 = VBAT_OV/(1.5*VBIAS(max))-1 = 1.15
               R7 = 4.64MΩ
               R6 = 5.35MΩ = 5.36MΩ

> Recalculate
               VBAT_UV = 3.91V to 4.11V
               *Ignoring R tolerance*

Battery Good Logic, VBAT Okay
Formula: VBAT_OK_PROG = VBIAS(1+R9/R10)
Formula: VBAT_OK_HYST = VBIAS(1+(R8+R9)/R10)

> Desired Overvoltage
               VBAT_OK = 3.4V
               HYST = 3.4+200mV (1.25V is the smallest possible!!!)

> Determine Resistor Divider
               R8+R9+R10 = 9MΩ to 11MΩ
               VBIAS = 1.21V to 1.27V
               VBias = 1.25V (typ)

> VBAT OK Calc
               R9/R10 = VBAT_OK/VBIAS(typ)-1 = 1.88
               R10 = 3.6MΩ
               R9 = 6.19MΩ = 6.20M
               VBAT_OK_PROG = 3.29V to 3.45V

> VBAT HYST Calc
               ((VBAT_HYST/VBIAS)-1)*R10-R9 = R8
               R8 = 0.568 = 560k

> Recalculate
               VBAT_OK_HYST = 3.48V to 3.65V
               *Ignoring R tolerance*