I am using the EVM circuit design with an added NTC thermistor for temp compensation on the solar panel. I am charging an LiFePO 12.8V battery pack with 18Vmppt from the solar panel. The EVM is working correctly, but my design is not charging.
Issues I have identified already:
SRN-SRP=-1.8V (this should be -0.5V to 0.5V, I have changed R6 to correct this difference but does not fix the issue)
Vbtst-Vph= 0.4V (below 4.2V should drive Q1:B on to recharge the btst capacitor) Could my cap not be increasing my voltage enough?