Solar Power Manager 5V SKU DFR0559
HH.PP 2025-08-17 16:54:00 1554 Views3 Replies This should be a MPPT solar charger https://wiki.dfrobot.com/Solar_Power_Manager_5V_SKU__DFR0559
But the datasheet for the used CN3065 did not say that the part support MPPT - instead of the CN3791 for example.
What is true?
I bought a Solar Power Manager 5V panel: [https://www.dfrobot.com/product-1712.html?srsltid=AfmBOoql64sXkxuxceSVrLg48sHRCxUi8qGtiQF_OAOi8ErP5qpWYvgv](https://www.dfrobot.com/product-1712.html?srsltid=AfmBOoql64sXkxuxceSVrLg48sHRCxUi8qGtiQF_OAOi8ErP5qpWYvgv)
I'm having a problem; the voltage on the lithium battery, when switching from 3.76V, doesn't reach 4.2V, and the battery is new.
Alexsandrotg Disconnect solar panel and feed 5V regulated input (USB or lab supply) If battery reaches 4.2 V board is fine.
Based on the CN3065 datasheet, this chip is a linear charger (CC/CV) with support for use from solar-type voltage sources, but it is not a “true MPPT” switching converter in the classical sense. By contrast, CN3791 is explicitly described in its datasheet as supporting MPPT capability. The datasheet lists an “MPPT Regulation Voltage” (via an MPPT pin) and states that the chip adopts a constant-voltage method to track the photovoltaic cell’s maximum power point.
ahsrab.rifat 
Solar Power Manager 5V DFR0559