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MOSFET instead of Diode for Solar panel?

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Zero999:

--- Quote from: panoss on August 06, 2019, 08:55:56 am ---
--- Quote from: Kleinstein on August 06, 2019, 08:02:06 am ---The MOSFET instead of a diode for reverse polarity protection is Ok
--- End quote ---
It was not meant to be for reverse polarity protection, but for preventing battery 's discharging through the solar panel.

--- End quote ---
Yes, a MOSFET is fine for reverse polarity protection, but will not prevent the battery from discharging back into the solar panel.

tunk:
I'm no expert on this, but there may be two potential problems with this setup:
- most TP4056 boards are setup to charge with 1A. With your solar panel this may not work at all.
  It may be better to use a (schottky) diode and a BMS.
- this board outputs the 18650 voltage: 3V may be too low for a 5V arduino, and 4.2V may be too
  high for a 3V arduino.

Seekonk:
A solar panel is a current source and having a diode drop or not makes no difference. The current leakage is likely so small that having a diode doesn't gain anything.

Eldi4:
If you really want to minimize the voltage drop because of diode forward voltage on solar panel circuitry, you should take a look at 'Ideal Diode' IC, like LTC4376, or you can build yourself with some p-channel mosfet, some tranny and resistor, just search 'Ideal Diode Circuit' at google,

panoss:

--- Quote from: tunk on August 06, 2019, 02:42:24 pm ---I
- most TP4056 boards are setup to charge with 1A. With your solar panel this may not work at all.
  It may be better to use a (schottky) diode and a BMS.

--- End quote ---
I 'm in the process of testing, I 'll post results.
(till now I 'd say 'so and so')


--- Quote from: tunk on August 06, 2019, 02:42:24 pm ---I
- this board outputs the 18650 voltage: 3V may be too low for a 5V arduino, and 4.2V may be too
  high for a 3V arduino.

--- End quote ---
I 've tested my 3.3V Arduino with 4.2V, it has no problem. (I think it can tolerate up to 6V (datasheet, Maximum operating voltage= 6V) at it's power supply pin(the 3V3 pin))



--- Quote from: Eldi4 on August 08, 2019, 04:21:00 am ---If you really want to minimize the voltage drop because of diode forward voltage on solar panel circuitry...

--- End quote ---

According to Seekonk, the voltage drop doesn't matter:

--- Quote from: Seekonk on August 06, 2019, 03:20:50 pm ---A solar panel is a current source and having a diode drop or not makes no difference. The current leakage is likely so small that having a diode doesn't gain anything.

--- End quote ---

@Seekonk

--- Quote from: Seekonk on August 06, 2019, 03:20:50 pm --- The current leakage is likely so small that having a diode doesn't gain anything.

--- End quote ---
When you 're saying 'current leakage' you are refering to the current that returns from the battery to the solar panel when the solar panel ouputs no voltage, right?

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