We all know that high current MPPT solar charge controllers are very expensive. The capacity of the MPPT Solar Charge Controller is always limited by the system battery voltage and the current rating of the MPPT charge controller.
For example, a 40 amps MPPT charge controller serving a 24VDC battery may only have a maximum capacity of 1000 Watts. That is very minimum to support an off grid load. Furthermore, a 40 amps MPPT charge controller will not provide a continuous current of 40 amps, due to the overheating of the NPN & PNP junctions inside the charge controller. The MPPT Solar Charge Controller could become very hot when passing 30 amps continuously.
One may argue that we could install many of the MPPT Solar Charge Controllers in parallel to increase the capacity. However, the MPPT charge controller input voltage will be crimped down by any one of the MPPT controllers. Especially when one of the controllers overheats, or the solar irradiant conditions changes rapidly.
The Solar Charge Maximizing Controller in the SCMC System overcomes above issues by passing the high current through the Solar Charge Maximizing Controller (120 amps), and limiting the current through MPPT charge controller. The system’s capacity can be increased above 150 amps easily.
The high DC current from the SCMC system may be used for domestic water heating and space heating, so the high capacity of the inverter is not required.
The charging cycles of the LiFePo4 battery are not necessarily consumed when the SCMC is operating, as the LiFePo4 Battery is there to maintain the optimum operating voltage of the SCMC system.
Following YuTube Videos will explain better than the above wordings: