MPPT tracking techniques used?

Charge Controllers
1

What MPPT tracking techniques are used/implemented in the MPPT-2420-LC/HPX ?

One of these or something complete different?:
Indrect (fixed voltage/fractional open voltage) vs direct (perturb and observe/incremental conduction)

mppt_techniques
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Source:

2

Oh, sorry, just saw that I missed this post.

It’s the “Perturb and Observe” method.