Solar panel
Started by Lord Ponsonby, 9th December 2019 11:37 in Talk & Chat

  1. #1 | 2138977
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    Default Solar panel

    I can only get half an amp charge out of a 100 watt 12v panel in full sun. It should be more .

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    Lord Ponsonby
    I can only get half an amp charge out of a 100 watt 12v panel in full sun. It should be more .
    Lol....as if you've been outside...

  3. #3 | 2138988
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    Reg Perrin
    Lol....as if you've been outside...
    What does that have to do with anything?

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    Reg Perrin
    Lol....as if you've been outside...
    I think you'll find it's the panel that needs to be outside, not the user.
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  5. #5 | 2138990
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    Hmm
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  6. #6 | 2138991
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    Always upside down here.

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    Lord Ponsonby
    I can only get half an amp charge out of a 100 watt 12v panel in full sun. It should be more .
    What's it powering? Amps is Volts divided by the resistance of whatever is drawing power from the system. At 12V you'd need a resistance of 1.44Ω to get 100W, and that's very low resistance for domestic purposes. I wouldn't expect to see that kind of resistance on any kind of circuit longer than a couple of inches unless you've invented a room temperature superconductor or you've got a short somewhere.
    If the panel is being used to power say a battery charger then the current draw will be determined by the charger, not the panel.
    I can, for example, charge my mobile at 2A but I don't for a variety of reasons. I find half an Amp is enough.

  8. #8 | 2139016
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    Memnoch
    What's it powering? Amps is Volts divided by the resistance of whatever is drawing power from the system. At 12V you'd need a resistance of 1.44Ω to get 100W, and that's very low resistance for domestic purposes. I wouldn't expect to see that kind of resistance on any kind of circuit longer than a couple of inches unless you've invented a room temperature superconductor or you've got a short somewhere.
    If the panel is being used to power say a battery charger then the current draw will be determined by the charger, not the panel.
    I can, for example, charge my mobile at 2A but I don't for a variety of reasons. I find half an Amp is enough.
    Charging a 140ah battery via a solar regulator. Cable runs are around 2m and 6mm diameter cable. No load attached. Battery is a little low at 11.7 volts. Figures on the net suggest that I should be getting in excess of 5 amps. It is 0.7 now. I would expect more, even at this time of year.

  9. #9 | 2139018
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    Whereís Forker? Heís good at this sort of thing.

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    Lord Ponsonby
    Always upside down here.
    Itís what happens if you hold the phone the wrong way up when you take the picture.

    No, seriously, thatís what it is.

 


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