back to HW-845 3A MPPR controller

components:




This little board has three major sections: isolation for the solar panel (prevents backflow of power into the
panel when there's no sun), a solar controller with indicator LEDs (controls buck regulator based on solar
power and battery charge state), and a buck regulator circuit. (converts high voltage low current solar to
low voltage high current for charging a 12v lead acid battery)

solar panel isolation: TPC8107 P-channel mosfet (30v 13A 1.9w)

solar controller / buck regulator: CN3767 (28Voc 18Vmpp 40w 3.3A)

buck regulation:
  9R5MS power inductor (9.5uH 9.6A)
  A0D4185 P-channel mosfet (40v 40A 62.5w)
  SB1045L schottky diode (2x) (45v 10A)



9R5MS power inductor.pdf


A0D4185 p-channel mosfet datasheet.PDF (299 KB)


CN3767 MPPR solar controller datasheet.PDF


SB1045L schottky diode datasheet.pdf (598 KB)


TPC8107 p-channel mosfet datasheet.PDF


HW-845 typical schematic:



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last updated 06/04/2025 at 18:34:11 by make_www_index.command version 2025.05.20.B