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  • Solar Regulator

    Does anyone know if solar regulators can boost voltage if it's below 12V?

    If it can do this, I'm looking at using one for a 2nd battery in the boot.

    If not, I'll end up using a Redarc DC-DC charger.

    Thanks,
    2019 GXL, Bullbar, UHF, Redarc Brake Controller, Tow Bar, Secondary Fuel Filter

  • #2
    Quick answer for standard type regulators no.
    HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

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    • #3
      As far as I know, what a solar regulator does is to make sure that any input from the solar panel does not go over the set voltage and also to make sure that voltage does not flow back out to the solar panel.
      Michael and Kelly

      [SIZE=1]1999 Prado Snowy 3.4L petrol, Ultimate Suspension 50mm lift (2013)[/SIZE][SIZE=1], BFG A/T, bull bar, winch, Twine hot water shower, home made rear drawers, Shippshape car top tent, UHF radio, tablet GPS & Navman GPS (both running OziExplorer)[/SIZE][SIZE=1], Spot 1, solar panel, second battery, inverter, Engel fridge and more[/SIZE]

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      • #4
        Older style solar regulators can only reduce voltage, most used Pulse Width Modulation (PWM), this works by turning the output on and off very quickly and but varying the on and off time (pulse width), this changes the voltage. Recently a new style of regulator has become available, Maximum Power Point Tracking (MPPT), these use a form of DC-DC conversion to maximise power transfer, so by reducing the voltage they actually increase the current, where as the PWM can only reduce the voltage, current stays the same (sort of) therefore reducing the power.

        A MPPT regulator may work in your situation, but they are not designed for this and as such I doubt they would work as well as the Redarc, also MPPT are still quite expensive (about twice the price of a comparable PWM), so I don't think you will gain any thing by using one.

        Matt
        waltec
        Senior Member
        Last edited by waltec; 08-02-2012, 05:35 PM.
        2003 Prado Grande TD Auto Pearl White

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        • #5
          From my limited understanding

          A MPPT regulator can't boost the voltage from the panel, it basically is a matching device
          that determines what voltage the panel can generate the most amps at and adjust the load,
          ie the charge to the battery to keep the panel at its optimum voltage.

          Most panels will generate around 17V unloaded in bright sun light, if the panel is only outputting 12V it's either a 6V panel or its faulty and that's the maximum voltage you can get out of the regulator.

          A dc dc charger works by taking more current from the source and using this to generate
          a higher voltage, that is why a 40AH charger will draw around 50AH - 60AH under full load.

          If your panel can now only generate 12V into the load, and you connect a dc dc charger, to maintain
          the same 12V output it will have to draw more current from the source which will drop the panels
          output voltage and you'll end up with less output voltage.

          The only way it will work is if the panel generate a lot of current whilst maintaining 12V.
          HKB Electronics, manufacturer of the Alternator Voltage Booster, Silver 2008 D4D,Lifted,Underbody protection, Alternator Voltage Booster, Tiger Z winch, Lightforce DL, Air Horns, Tanami Drawers, Drop down fridge slide, Outback cargo barriers, Rotronics dual Battery system, Polaris GPS, HF/UHF/VHF, Radio speaker combiner, Long ranger water tank, Diff breathers, Inverter, Snorkel and others

          Comment

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