an MPPT tracker is fitted to inverters controlling multiple panel set ups. Under normal circumstances the output will drop to the level of the worst performing panel, say if one is in partial shade. An MPPT tracker helps minimise this effect by balancing the output better to the best performing panels.
However, an unshaded, or predominantly unshaded, system will perform better without the MPPT activated.
There is no value to having an MPPT tracker fitted to a single cell system.
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