I modified by TP4056 charge module like this Adding power path to TP4056 solar battery charger and limit output voltage to 5.5 V or below. But my charger's output is wind-powered so varies a lot, sometimes less than 5 mA, but constantly at 5 V. The problem is that when the power path circuit detects that 5 V is present, it disconnects the battery. But my load draws 50 mA, so the load can't function correctly.

Is there a good way or IC that enables pass-through charging? Power banks made by "Voltaic" do this but they are expensive. I don't know how to reproduce their functionality.

  • \$\begingroup\$ What's a "Voltaic battery"? \$\endgroup\$ Commented Jun 25, 2023 at 22:07
  • \$\begingroup\$ Existing product which has pass-through charging that works even at low charging currents voltaicsystems.com/v25 \$\endgroup\$ Commented Jun 25, 2023 at 22:16
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    \$\begingroup\$ That is not a "battery". It does have a battery inside, yes, but it is not a battery. It is a power bank. And "Voltaic" is a brand, not an adjective. I will modify your question to make that clear. \$\endgroup\$ Commented Jun 25, 2023 at 22:18

1 Answer 1


Place a power resistor across the wind generator to drag down the voltage to below 5 V when the wind is slow.

  • \$\begingroup\$ I want to be able to charge even when input current is below 50mA. This also won't work because load current has peaks. \$\endgroup\$ Commented Jun 25, 2023 at 22:19

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