Exclusion of zero value when reading Modbus

Energy
1

Hello
How to exclude reading zero value at Modbus in configuration.yaml (energy reading from meter sometimes gives zero value, which disturbs energy panel values). From what I found out HA has problems with the Modbus standard.

modbus:
  - name: "iSMA"
    type: tcp
    host: 192.168.3.123
    port: 502 
    sensors:
      - name: "iSMA Energia pobrana"
        device_class: energy
        unit_of_measurement: kWh
        slave: 1
        address: 1020
        input_type: holding
        count: 2
        swap: word
        data_type: float32
        precision: 2
        scan_interval: 60
      - name: "iSMA Energia oddana"
        device_class: energy
        unit_of_measurement: kWh
        slave: 1
        address: 1022
        input_type: holding
        count: 2
        swap: word
        data_type: float32
        precision: 2 
        scan_interval: 60
2

Use templates or filters after modbus sensors

3

I have it, but how do I make it to attach for value zero the previous reading? With this condition I have at zero the value of the entity undefined

template:
  - sensor:

      - name: "Energia pobrana"
        device_class: energy
        unit_of_measurement: kWh
        state: >
          {% if states('sensor.isma_energia_pobrana') | float > 0 %} {{ states('sensor.isma_energia_pobrana') | float }}
          {%- endif %}
      - name: "Energia oddana"
        device_class: energy
        unit_of_measurement: kWh
        state: >
          {% if states('sensor.isma_energia_oddana') | float > 0 %} {{ states('sensor.isma_energia_oddana') | float }}
          {%- endif %}
4 
      - name: "new sensor"
        state: >-
          {% set x = states('sensor.modbus')|float(0) %}
          {% if x > 0 %}
            {{ x }}
          {% else %}
            {{ states('sensor.new_sensor') }}
          {% endif %}
5

Thank you for the hint.
And how to make that a change of ±10 value is rejected