2x 48v 100ah lifepo4 battery not charching by Tomatech Inventor

[burakcoskun]

I have the following setup:

6 x 550 Wp Solar Panels (each with 49V)
2 x 48V 100Ah LiFePO4 batteries (Model: Aspilsan 48V/100Ah)
The batteries are connected in parallel, as shown in the photo.
Connections 1 and 2 are going to the inverter.


System Setup:

Inverter: 1x Tomatech MPlus 7.2K 48V MPPT Monofaz Inverter
Charging Voltage: 54.6V
Charge Current: 50A
Cut-off Voltage: 42V
Current Issue:

The solar panels are not charging the batteries when the grid is not available.
The house is being powered by the solar panels and batteries, but the batteries are not recharging.
The battery level is currently at 0% at the application.
The battery does not have a BMS

Battery Settings:
I selected USER as the battery type in the Tomatech inverter settings.

For this setup, should I buy an additional MPPT charger or an AC-DC 48V adapter to feed the batteries directly from the inverter's AC output?
Or is there something I need to change on the inverter to enable direct charging from solar → inverter → battery?
Thanks a lot for your time, everyone!"

 

[WorldwideDave]

perhaps you have the 'charger' settings on your inverter set wrong?
If your load - the current flowing out - of the batteries is higher than the current flowing into the batteries from the MPPT, then yes, the battery will drain and not recharge.
Tell us about the loads you are running.
There might be a setting in the application to adjust the battery state of charge, but it could also be doing it by voltage of the batteries.
do you have a test meter you can connect to positive and negative of each battery and report back the voltage it reports?