entit vs reg modbus rtu

[jtrefil]

Hello.
please help or advice.
I'm trying one attempt and I don't know much about modbus registers.
I need to find the correct registry for these entities. I do have a PDF from modbus, but due to my inexperience I can't assign it correctly.
Can you please put me on the right track?

import - sensor.solax_grid_import
export - sensor.solax_grid_export
measured - sensor.solax_measured_power
batt.charge - number.solax_battery_charge_max_current
batt.disch - number.solax_battery_discharge_max_current
batt.capac - sensor.solax_battery_capacity
batt.power - sensor.solax_battery_power_charge
inv.power - sensor.solax_inverter_power
inv.power_1 - sensor.solax_inverter_power_l1
inv.power_2 - sensor.solax_inverter_power_l2
inv.power_2 - sensor.solax_inverter_power_l3

Thank you, very much.
Jan