Hey, Rado, the solar implementation is prepared for 1.7 release of the FW. We're working on some unrelated bugs and should release in the upcoming week(s). The setup of energy meter should be as for dynamic load balance -> the meter is right after the inlet of the grid. For solar to work, the meter has to show negative current values (current direction) or must be in the list of supported meters (which will be provided in the wiki).
The basic functionality of solar will have 4 modes: 1) fast charge, 2) full green, 3) eco and 4) eco+. The fast charge mode will perform just as dynamic load balance - the total consumption of the evse will not go over the max amps from grid value. However, the EVSE will use any solar surplus power that is available. 2) the full green mode will use only solar power, that is no power from grid will be drawn. For this mode to work, the minimum power from solar panels/inverter provided must be at least 6 Amps. 3) eco mode is a mix of fast charge and full green modes. Additional setting will be added which sets the maximum value of amps the EVSE will provide to the car when no or insufficient solar power is available. This means the EVSE will compensate the lack of solar power from the grid. When surplus of solar power (or total solar power generated) is higher than the value set in eco mode, the EVSE will provide all the solar power that is available. 4) eco+ mode is like a mix of full green and eco modes. Additional setting will be added which sets the minimum value of solar amps that must be present for the charge to initiate/continue. The range of this parameter will be 1 - 6 Amps. In this mode, if the solar power available is less than 6 Amps, but higher than the value set, the EVSE will charge at the maximum power of 6 A. However, if more solar power is available, the charging power will increase. That's the short description of the modes the 1.7 solar functionality will bring.
Additional logics that will be implemented: when solar power decreases mid charge, the 30 second counter will start which will end the charge if not sufficient power from solar is generated. After this countdown finished, the charging will only begin after 2 minutes after the solar power is once again available. If solar power decrease occurs when EVSE is not charging, no such delays will be active. The delays are also not considered when used with fast charge and eco modes.
That's a short description of the solar algorithm that is implemented in the 1.7 FW. Hope this answers your questions.