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Bypassing a built in MPPT charge controller

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  • #16
    I'd use 2 panels in series, with 1 PWM charge controller, wired to the batteries for 24V
    then I'd use the other 2 panels the same way, in series, with a PWM controller, to the batteries.

    That gives you a fairly redundant system.
    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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    • #17
      Hie there every one, so an update on my system, i was getting ready to buy a pair of PWM charge controllers as per Mike90250's recommendation, but then a friend of mine just upgraded his system and agreed to sell me his 60amp MPPT controller, i have attached a page from the manual with the specs. i would really appreciate some advise on how to utilize the 60amp MPPT with my system i.e ( a 24volt 1500watt hybrid inverter, Two 200AH sealed lead acid batteries and Four 150watt 12volt panels) ​​​​​​​
      60amp.jpg
      Attached Files

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      • #18
        That's not a real great MPPT controller.

        for a 24v battery, you are limited to 48Voc input, which is hardly a useful range for a MPPT controller. if that one controller is less then 2 of the PWM controllers, maybe it's worth it, but if I was buying it, I'd be looking for some user feedback (not amazon reviews)
        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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        • #19
          Thank you for your advise Mike90250, it's much appreciated,i think i will pass on this one

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          • #20
            Hie everyone, i need some help with understanding my 24volt battery bank i have two 150AH 12volt sealed lead acid batteries wired together in series to make 24volts. The issue is the built in charge controller on my inverter is showing battery voltage as 27.4 and a percentage reading of 82% the charge controller is displaying stage 2 and 5amps. My question is what is a correct voltage for a fully charged 24 volt battery bank?

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            • #21
              Here's a general voltage chart for battery banks

              voltchart1.gif
              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

              Comment


              • #22
                Hello all, just a quick update, i returned the inverter i had with the 25amp MPPT after considering the advise and comments here, i have since secured a 2000watt inverter with a built in 40AMPT MPPT, Max PV array is 1000watts and the VOC is 102Volts and VMP 80Volts.

                The new unit has a lot of flexibility on how it can be configured, I have a question particularly regarding to the charge setting of the unit VS the recommended charge settings for the batteries, i have included images from the battery manual the pages has float and cyclic charge voltages at 13.50+0.1volt per module for Float and 13.90+0.1volt for cyclic charge voltage.

                The inverter's charge settings areas follows, Float charge 27volts default but can be set to anything between 25.0volts to 30.0volts and Bulk Charge settings are 28.2volts default but cab be set to between 25.0volts to 30.0volts.

                please could you advise me if the default settings are accurate or they need adjusting and if so please advise me what the correct settings should be. My batteries are two 12volt 150AH modules of sealed lead acid wired in series for 24volts

                regards Keith
                Attached Files

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