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MPPT or PWM charger? For LiFePO4 battery?

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  • #46
    Originally posted by choyak View Post
    The MPPT will never boost since I have the panels in 'serallel'
    I suspect that Terry used "boost" to refer to what we commonly call either Bulk or Absorb rather than to the DC to DC converter operating in [I]boost [/I]rather than [I]buck[/I] mode.
    I have never seen an MPPT CC that claimed to be able to boost the panel voltage to produce a higher voltage to the battery.
    SunnyBoy 3000 US, 18 BP Solar 175B panels.

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    • #47
      Boost MPPT does exist, I think the brand is Genasun, also there is a chip, SGS Thomson SPV1020 which will boost.

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      • #48
        Makes more sense now, different terminogy in different countries often causes confussion. Some of the grid supply up market MPPT controllers have a boost function, but it is extremely rare in low voltage battery charging units. If the MPP was lower than the battery voltage it is highly unlike much current was going to be avaiable.

        So, I'll rephrase the question, does you MPPT controller return to the bulk stage during the day if there is a heavy discharge, or does it wait till sun down to reset the unit?

        T1 Terry

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        • #49
          Originally posted by inetdog View Post
          I suspect that Terry used "boost" to refer to what we commonly call either Bulk or Absorb rather than to the DC to DC converter operating in [I]boost [/I]rather than [I]buck[/I] mode.
          I have never seen an MPPT CC that claimed to be able to boost the panel voltage to produce a higher voltage to the battery.
          or perhaps equalize?
          NABCEP certified Technical Sales Professional

          [URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]

          [URL]http://www.calculator.net/voltage-drop-calculator.html[/URL] (Voltage drop Calculator among others)

          [URL="http://www.gaisma.com"]www.gaisma.com[/URL]

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          • #50
            Originally posted by T1 Terry View Post
            ...... So, I'll rephrase the question, does you MPPT controller return to the bulk stage during the day if there is a heavy discharge, or does it wait till sun down to reset the unit?
            T1 Terry
            The low voltage and dwell time (to reset the charger) is programable in the morningstar MPPT 60 that I have.
            Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
            || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
            || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

            solar: http://tinyurl.com/LMR-Solar
            gen: http://tinyurl.com/LMR-Lister

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            • #51
              Originally posted by Naptown View Post
              or perhaps equalize?
              Just to confuse things further, in the context of vehicle cranking battery chargers, the description of a "boost charger" or "battery booster" usually refers to being able to put out enough current to enable cranking the engine by supplying some of the current itself, without taking time to put any significant charge on the problem battery.
              SunnyBoy 3000 US, 18 BP Solar 175B panels.

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              • #52
                Looks like Genasun makes MPPT solar charge controllers for LiFePO4 as well as lead acid.

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