Here is how it was explained to this tech.
A couple things to remember;
The rate of heat transfer is dependent on the temperature difference.
Just like suction superheat, adding heat does not change the pressure.
The increase in superheated refrigerant vapor temperature, in the solar collector provides faster de-superheating in the top of the condensing (vapor is hotter) therefore more of the middle of the condenser can be used to change the state and thereby, increasing subcooling and at least bring the liquid refrigerant temperature closer to ambient.
We tested, and concluded, it was time we told them to remove our brand names and that adding these solar panels voids our warranty.