Solar Charge regulator

Discussion in 'Solar Power' started by Diabalo, Oct 8, 2010.

  1. Diabalo

    Diabalo Funster

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    I have been having doubts about my solar panel charge regulater for a while now.

    This morning open circuit volts on the panel was 17.6v
    With the panel connected to the regulator it goes down to 12.88 and the load side (hab batt) showing the same.

    Now if i switch the onboard charger on, the hab batt side reads 14.12 v which is to be expected but the solar panel side has gone up the same, I don't think it should do that or am I wrong?
     
  2. hilldweller

    hilldweller Funster Life Member

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    12.88 looks OK - reg is hard on trying to charge battery. 12.88 is all it can manage for the current being drawn.

    14.12 tricky. If the charger is set to charge to 14.12 or hits it's current limit at 14.12 then the solar may also be trying to raise this but limits at 14.12, in other words it's still hard on.

    What I'd try is putting a 6W ( or 21W ) bulb across the solar output and get a reading ( or 2 ) and see what the thing delivers. With only 6W it shoud be able to fully light it and then you'll read it's maximum voltage. If it hits 17V then it looks like the output transistor has gone short circuit.
     
  3. Diabalo

    Diabalo Funster

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    Will give that a go Brian:thumb:

    Cheers
     
  4. Wildman

    Wildman Read Only Funster

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    may as well chuck in my 2 penoth, readings seem normal, the charge regulator is just seeing the battery voltage. When a external charge is applied the reading across the battery terminals will rise, the regulator if a simple one will just be seeing that voltage irespective of the solar panel. i.e. it will see the higher of the two voltages. then seeing a higher voltage it will reduce or even cut off the charge from the solar panel.
     
  5. pappajohn

    pappajohn Funster Life Member

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    not into electronics but surely if the charger is on its taking some of the load off the solar charger and the controller input voltage will rise accordingly.
     
  6. Diabalo

    Diabalo Funster

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    I assumed that the input side of the regulator would only read the imput volatge from the solar panel I didn't expect voltage to be flowing back from the output side of things
     
  7. pappajohn

    pappajohn Funster Life Member

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    just my way of seeing it.....

    its not feeding back.

    the input voltage from the panel is getting sucked and sqeezed into the controller to give a variable output voltage/current (load)....ease the sucking and sqeezing by turning on the onboard charger and the voltage will rise as its not needed as much.

    much like a battery on load, the volts will be lower than off load...even if only loaded for a few seconds.

    probably talking bollox though. :Doh:
     
  8. pinkgin

    pinkgin Funster Life Member

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    cant help with the problem dane But just wanted to say WELCOME BACK,,,,:BigGrin::BigGrin::BigGrin:
     
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