Charge control @minimum cost.

Discussion in 'General Electronics Chat' started by ouzcoskun, May 17, 2016.

  1. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    Hello,
    I just build 2 wind propellers and made 2 dynamos out of trash.
    My first dynamo is made of an old air condition in house ventilation motor. I just added 4 magnets in it and it gives me approx. 12 - 30 Volts.
    My second dynamo is made from an old water jet pump motor case. I added 4 magnets around it's rotor. I added used washing machine water inlet coils. I used old construction iron bars to fill them and with a diode gate for each coil I have increased the efficiency.
    Now this gives me approx. 20 - 40 Volts.
    I try to add them to charge 12 Volt Battery(s)
    I need an automatic cut off charge circuit where it will give the current out for the leds when in the night I will turn the led lightnings on.
    Shortly; my electronic device has to help using battery as a first electric source, has to help the battery to charge from the wind and the sun ( off course I will add solar panels) and has to help battery to charge from the electric network.
    I am planning to use
    BATTERY MANAGEMENT SYSTEM (LTC6802 & ARDUINO)
    Do you have advice(s) ?
    Thank you very much for your time and interest.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,103
    3,038
    The lowest cost solution could be a simple blocking diode on each source, with all sources ORed to the battery. We can't tell whether the dynamos are large enough to damage the battery. If they are, than you will need something more complex.

    Do you know the power output capacity of your windmills? It depends on the cube of wind speed, so it would be great to measure the power at a certain wind speed. It also depends on the load, so it helps to vary the load over a wide range to find the optimum.
     
  3. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    circuit.gif
    I have this diode gates for each coil increasing me the efficiency of the system. Sure I will check more precisely the power of my windmills' dynamos. I just added them in serial to get the most since I do not have any other solution.
     
  4. wayneh

    Expert

    Sep 9, 2010
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    3,038
    That's very inefficient because there are so many diode voltage drops in a serial configuration. It's not so bad if the dynamos are all producing a relatively high voltage.
     
  5. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    With this diode system (used in each dynamo) the efficiency increases because the main problem with the coils is; Each time a magnet get closer to a coil the circulation starts, but since the magnet moves, the direction of the electrical circulation in the coil changes its poles. And with this diode gates I got the maximum power from each coil, anyway the circulation poles are the gates are correcting them. But I do not know how to add dynamos and even solar panels one to another but serial.
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,103
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    Adding your dynamos in parallel (after rectifying) is an option but of course the choice depends on the dynamos and the load you are powering.
     
  7. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    I will try this one too. Thank you very much.
     
  8. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    I added them with diodes again.
     
  9. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    And I also added a 4N35 to protect the charge.
     
  10. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,783
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    You may need to add a relay and a "dump load" to the system.
    Solar panels only might not need it, but in the months with high winds, wind generators tend to output more power than the batteries can take. When fully charged the relay "dumps" the wind generator output to another load, usually a heating coil, to prevent boiling away the battery electrolyte.
     
  11. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    Thank you very much for your note. The charge circuit is already controlling the voltage with LM317 regulator and stopping the charge when it is over 12.50 V. on the battery. (approx) Do you still think I need this relay and dump ?
     
  12. Kermit2

    AAC Fanatic!

    Feb 5, 2010
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    Just disconnecting the source from the batteries will protect them, but without a load to provide resistance, the wind generators could over speed and damage themselves in high winds.
    That is why a dummy, or dump load is used. One could just short the genny's output together and accomplish the same thing, but it is hard on the copper windings to short the output during high winds.
    An old heating element from a stove or water heater can work well as a load.
     
  13. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    I have to learn about this. I will add a relay and a dump.
    Thank you very much for your time and interest.
     
  14. wayneh

    Expert

    Sep 9, 2010
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    Many windmills incorporate a mechanism to take them off wind when the wind velocity is excessive. An electrical load acts as a brake on the rotating blades, but that might not be enough. The wiring in the generator and/or the load will eventually be overwhelmed at some wind speed. It's a very "sharp" effect, since the available power in the wind goes up with the cube of the wind speed.
     
  15. ouzcoskun

    Thread Starter New Member

    May 12, 2016
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    I added a timer with a light sensing circuit and a PIR motion sensor.
    I have added the circuits I have found by chance on the internet.
    Could I finish this all with only just one IC ?
     
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