CN3791 MPPT charger test, MPPT voltage 9V

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Testing the charger. At first sight it looks OK, but it turned out that the voltage drops below the MPPT voltage (for example a cloud blocks the sun) the charger stops chrging and doesn't restart. It is not acceptable.
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Are you charging a battery? What's the battery voltage? Specification says that it will only restart if the input voltage exceeds the battery voltage... does it do that?

coenraadloubser