inverter MPPT Solar Controller 40A

MPPT:

The MPPT controller could be considered to be a “smart DC-DC converter”, i.e. it drops the panel voltage (hence “house panels” could be used) down to the voltage required to charge the battery.  The current is increased in the  same ratio as the voltage is dropped (ignoring heating losses in the electronics), just like a conventional step-down DC-DC converter.  

The “smart” element in the DC-DC converter is the monitoring of the maximum power point of the panel which  will vary during the day with the sun strength and angle, panel temperature, shading and panel(s) health.  The “smarts” then adjusts  the input voltage of the DC-DC converter – in “engineering speak” it provides a matched load to the panel.

The best panel match for an MPPT controller:

To match a panel t o an MPPT controller it is advisable to check the following:

The panel open circuit voltage (Voc) must be under the permitted voltage.

The Voc must be above the “start voltage” for the controller to “kick-in”

The maximum panel short circuit current (Isc) must be within the range specified

The maximum array wattage - some controllers allow this to be “over-sized”, e.g the Redarc Manager 30 is permitted to have up to 520W attached.

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