| Electronics > Projects, Designs, and Technical Stuff |
| 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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