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Connecting Photovoltaic Panels to Windmill Using ML 2420 Regulator and AGM-100 12V 100Ah Battery

Szymelek 23937 16
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  • #1 18632259
    Szymelek
    Level 5  
    Hello, I have recently added a windmill to my mini solar farm and the thing is whether I can connect the panels and the turbine to one regulator from the panels. I have 5 panels, I will provide a photo with the parameters below, I have the ML 2420 regulator connected to them, it is 20A with 100V and AGM-100 12V 100Ah battery. panels please help Connecting Photovoltaic Panels to Windmill Using ML 2420 Regulator and AGM-100 12V 100Ah Battery
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  • Helpful post
    #2 18632301
    mongaz
    Level 12  
    Hello, from what I understand, you want to connect the fan to the panel regulator. This is not possible on this controller. You need to look for a hybrid regulator or use a separate regulator for the fan and connect it in parallel to the battery.
  • #3 18632319
    Szymelek
    Level 5  
    Oh, because I once read that the diodes go to one regulator. Wouldn't those two controllers conflict with each other?
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  • #4 18632599
    MichałS
    Level 35  
    The M300 at its current price is not a good choice. It will be more advantageous to buy the S300, and this one usually has a charging controller in the set. Then you simply connect the output of the turbine controller to the battery and that's it.
  • #5 18632613
    Szymelek
    Level 5  
    And one regulator will not work for the other somehow not favorably? And in total, I could easily add one more 100Ah battery? Is it rather too little current to charge?
  • Helpful post
    #6 18633063
    mongaz
    Level 12  
    Each of the regulators will limit the voltage to the value needed to charge the battery. However, when there is sun, there is no wind and vice versa, we are talking about wind sufficient to drive the turbine so that it can work. Most turbine regulators, when the wind is too turbulent, make an artificial load to slow it down and protect it from damage. In contrast, the panel regulator will simply disconnect the panels if the voltage exceeds the upper value on the battery.
  • #7 18633094
    Szymelek
    Level 5  
    Thank you all for your replies ?
  • #8 19107720
    WindyAdam
    Level 2  
    Colleagues, write more about how such sets work for you and how they were combined? I mean a system where we mainly draw and store energy from PV and the turbine is to support the batteries and slow down their discharge.
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  • #9 19592992
    hynio82
    Level 8  
    And what would happen if I connected such a 12-24v turbine in series with the panels and to the old-time inverter ??

    Regards
  • #10 19593017
    MichałS
    Level 35  
    hynio82 wrote:
    And what would happen if I connected such a 12-24v turbine in series with the panels and to the old-time inverter ??

    Regards

    You would immobilize the installation, and depending on the voltage from the panels, the turbine would short-circuit/burn.
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  • #11 19720658
    renataandrzej
    Level 2  
    mongaz wrote:
    Hello, from what I understand, you want to connect the fan to the panel regulator. This is not possible on this regulator. You need to look for a hybrid regulator or use a separate regulator for the fan and connect it in parallel to the battery.


    In my case, in parallel connection of the fan and the panels, the fan regulator heats up.
    Is it acceptable?
    I haven't checked it to the end, but when there is no wind or sun, the gel battery discharges.
    Please give me info on this
  • #12 19721977
    MichałS
    Level 35  
    renataandrzej wrote:

    In my case, in parallel connection of the fan and the panels, the fan regulator heats up.
    Is it acceptable?

    Nothing writes what type / voltage of work / how it is connected.
  • #13 19722245
    renataandrzej
    Level 2  
    MichałS wrote:
    renataandrzej wrote:

    In my case, in parallel connection of the fan and the panels, the fan regulator heats up.
    Is it acceptable?

    Nothing writes what type / voltage of work / how it is connected.

    Sorry I'm improving ?
    2xSolars 150w12v , Solar regulator PWM12/24 connected to a 12v 100Ah battery
    12v 400w windmill, FW12/24 wind regulator connected to a 12v 100Ah battery
    Solar and windmill counted in parallel with the battery. The wind regulator is heating up,
    the battery is discharged
  • #14 19722800
    MichałS
    Level 35  
    renataandrzej wrote:

    Solar and windmill counted in parallel with the battery. The wind regulator is heating up,
    the battery is discharged

    Much indicates damage to the wind regulator. Is this the version with the gray sticker or the orange one? The gray one has its own current of 20mA, which is too little to heat up the housing.
  • #15 19723148
    renataandrzej
    Level 2  
    MichałS wrote:
    renataandrzej wrote:

    Solar and windmill counted in parallel with the battery. The wind regulator is heating up,
    the battery is discharged

    Much indicates damage to the wind regulator. Is this the version with the gray sticker or the orange one? The gray one has its own current of 20mA, which is too little to heat up the housing.


    Yes, you are right, it turned out that the wind regulator is damaged. When it is not charging (there is no wind) it consumes 3.28 amps. Today I crossed
    Thank you for your help. I will replace the regulator with an Mppt with an orange sticker. He is said to be better.
    Thank you again?
  • #16 19723487
    MichałS
    Level 35  
    Can you count on an autopsy of this damaged one?
  • #17 19723601
    renataandrzej
    Level 2  
    I'll try, but I don't promise I'm earned, busy ?
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Topic summary

✨ The discussion revolves around connecting photovoltaic panels and a wind turbine to a single regulator, specifically the ML 2420, while using an AGM-100 12V 100Ah battery. Users clarify that the ML 2420 regulator cannot manage both sources simultaneously; a hybrid regulator or separate regulators for each source is recommended. Concerns about potential conflicts between regulators and the feasibility of adding another battery are addressed. It is noted that each regulator will limit voltage to protect the battery, and issues with overheating of the wind turbine regulator are discussed, indicating possible damage. Users suggest replacing the damaged regulator with a more efficient MPPT model.
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FAQ

TL;DR: Gray wind regulators draw 20 mA at idle; "The gray one has its own current of 20mA". Overheating at idle signals a fault. This FAQ helps 12V PV+wind owners connect controllers and diagnose issues. [Elektroda, MichałS, post #19722800]

Why it matters: It shows how to combine PV and wind safely, avoid controller damage, and stop silent battery drain.

Quick Facts

Can I connect my wind turbine to the ML 2420 solar controller input?

No. "This is not possible on this controller." Use a hybrid controller or a separate wind regulator. Connect the wind controller’s output in parallel to the battery. The solar ML2420 stays on the PV side. This topology keeps sources isolated and the battery protected. [Elektroda, mongaz, post #18632301]

Will two charge controllers fight if both are on one 12 V battery?

No. Each controller limits battery voltage to its setpoint. "Most turbine regulators … make an artificial load to slow it down and protect it." The PV controller disconnects panels if the battery exceeds the upper voltage. Their behaviors prevent conflict when wired in parallel. [Elektroda, mongaz, post #18633063]

How should I wire PV and wind together safely?

Follow this three-step approach:
  1. Connect your PV array to the ML2420 solar controller.
  2. Connect the turbine to its dedicated wind charge controller.
  3. Wire both controllers’ battery outputs in parallel to the same battery terminals.
This approach keeps charging logic separate and avoids cross-coupling between sources. [Elektroda, mongaz, post #18632301]

Why is my wind regulator hot and the battery draining with no wind?

A hot regulator with no wind points to internal failure. One user measured 3.28 A idle draw from a failed wind controller. That parasitic load will drain a 12 V 100 Ah battery quickly. Replace the defective wind regulator to stop the discharge and heating. [Elektroda, renataandrzej, post #19723148]

What standby current is normal for the gray wind regulator?

"The gray one has its own current of 20mA," which is normal. That current is too low to heat the case. If the housing warms at idle, suspect a fault. Measure idle draw with the turbine stopped for confirmation. Replace the unit if consumption is excessive. [Elektroda, MichałS, post #19722800]

Can I put a 12–24 V turbine in series with PV to my inverter?

No. "You would immobilize the installation," and the turbine could short or burn. Series-connecting mismatched sources makes the turbine a load for the PV string. Keep the turbine isolated behind its wind controller and dump load circuit. Feed the inverter from the battery side only. [Elektroda, MichałS, post #19593017]

Do I need dump-load braking on the wind side?

Yes. Wind controllers apply a dump load when wind is too turbulent or fast. "Most turbine regulators … make an artificial load to slow it down and protect it." This protects blades, alternator, and electronics from overspeed. Ensure your wind controller includes a specified dump load. [Elektroda, mongaz, post #18633063]

What happens when there’s sun and wind at the same time?

Both controllers will charge the same battery independently. The PV controller disconnects if the battery reaches its upper voltage limit. The wind controller will switch to dump load as needed for protection. These actions coordinate charging and prevent back-feeding between sources. [Elektroda, mongaz, post #18633063]

Can I add another 100 Ah battery to my 12 V bank?

You can add a parallel battery if it matches type and age. Ensure your charger capacity suits the larger bank. For AGM lead-acid, a typical target charge current is ~0.1C (about 10 A per 100 Ah). With less current, charging takes longer and may not reach absorption timely. “BU-403: Charging Lead Acid”

Is the orange “MPPT” wind regulator better than the gray version?

One user confirmed a faulty gray regulator drawing 3.28 A at idle. They planned to replace it with an orange “MPPT” unit, reporting it is said to be better. Classify this as anecdotal and verify specs and idle draw before purchase. [Elektroda, renataandrzej, post #19723148]

How do I test a wind regulator for abnormal idle consumption?

Stop the turbine and measure the regulator’s current draw from the battery. The gray version’s typical self-consumption is 20 mA. Heating at idle suggests a fault. Replace the unit if measured draw is far above the nominal figure. [Elektroda, MichałS, post #19722800]

Can I use a PWM solar controller for PV while the wind has its own controller?

Yes. Keep each source on its dedicated controller and parallel their battery outputs. This method supports different technologies and control strategies. It also avoids controller conflicts. Use the PV controller for panels and a wind controller for the turbine. [Elektroda, mongaz, post #18632301]
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