tesla_excess_solar_charging_ha_template.yaml

# Template sensor for values of power import (active_power > 0)
      charging_amps:
        friendly_name: "desired charging amps "
        unit_of_measurement: 'A'
        value_template: >-
           {%- set min = 0 -%}
           {%- set amps = min -%}
           {%- set max = 13 -%}
           {%- set voltage = ((states('sensor.tesla_charger_voltage') |float )) -%}
           {%- set export = ((states('sensor.power_export') |float) / voltage ) -%}
           {%- set import = ((states('sensor.power_import') |float) / voltage ) -%}
           {%- set charging = ((states('sensor.tesla_state') == 'charging')) -%}
           {%- set charging_amps = ((states('sensor.tesla_charger_actual_current'))|float) -%}

           {%- if not charging -%}
           {%- if import > 0 -%}
           {%-   set amps = min -%}
           {%- elif export > 0 -%}
           {%-   set amps = export -%}
           {%- endif %}
           {%- endif %}
           
           {%- if charging -%}
           {%- if import > 0 -%}
           {%-   set amps = charging_amps - import -%}
           {%- elif export > 0 -%}
           {%-   set amps = charging_amps + export -%}
           {%- endif %}
           {%- endif %}
           
           {%- if amps > max -%}
           {%-   set amps = max -%}
           {%- elif amps < min -%}
           {%-   set amps = min -%}
           {%- endif %}
           
           {{ amps |round}}