I recently replace my AGM batteries on my Victron Multiplus 5000/48 with 2p16s LiFePo4s. The system worked as intended the first day charging from solar panels and inverting. Since then, it would just stay on Mains (not inverting) and shift from bulk to float with the DC voltage fluctuating between 52v to 59v. I checked voltage at the battery terminals and it was a constant 52.6v. On the Color Control and BlueSolar Charger MPPT 150/70 it would show the wild swings in DC voltage. I tried switching the Multiplus off then on. After switching on it would go into inverter mode for about 10 seconds (DC voltage stable) and then would switch to mains and bulk and DC voltage would fluctuate again. I've checked the cables and battery connections and they're all okay. I've tested with loads disconnected. I also tried changing the Absorption and Float voltage settings to no avail. Any help or suggestions to a solution would be greatly appreciated.
This is my device list:
MultiPlus 48/5000/70-100
BlueSolar Charger MPPT 150/70 (VE.Can)
Color Control GX
BMV-700
32 x 280Ah LiFePo4
Daly Smart BMS 16S 48V 250A