Charge controller for grid tie

Discussion in 'General Questions' started by bluejay, Oct 29, 2010.

  1. bluejay

    bluejay WindyNation Engineer

    Ok from what I have seen as long as there is a load the incoming voltage is capped within just a volt or 3 :D

    Follow me on this...Couldnt I use my chargecontroller (can set trip points) to monotor the voltage directly from the turbine and the grid tie(22-60)...Theory being that at 22 (can set to 28 trip point) the GT will begin feeding the grid thus not letting the turbine only rise slowly(guessing 22-5ish) as its feeding. THEN if the grid goes down it starts to freewheel so the voltage begins to spike creating the controller to switch(@28v) it to the divert load and it would switch back and forth until the grid went back up and then quit allowing it to hit the switch point?

    This is like my idea of putting a diode in between the battery and rectifier to run a voltage LCD directly on the rectifier to see voltage before the battery clamps it..Works well :D

    What do you guys think about this idea to eliminate the batteries?
  2. timber

    timber WindyNation Engineer

    Hi Bluejay,

    Please take anything I say here with a grain of salt because I am not familiar with "Grid-Tie" systems.
    In theory it sounds like this may work but I think the problem with this may be the constant and fairly rapid switching on your controller.
    I don't know what controller you are using but my controller (Coleman Air Model C80) would switch every 5 seconds until the power were back on line. That, IMO would put a lot of wear and tear on the controller relays if active for an extended period of time.
    That's the beauty of using a battery bank, it acts as a huge capacitor to slow down the cycling as well as provide some temporary power.

    Unless I misunderstand your theoretical setup, I would think that when the grid power is down is when you would want your turbine to supply some power the most. A battery bank would at least provide a UPS and could provide power for essential appliances such as refrigerator, freezer or pellet stove etc. Is there something I'm missing?

  3. bluejay

    bluejay WindyNation Engineer

    No I dont mind of using batteries on the dump side.I was just playing with ideas out loud for going from turbine straight to GT's..I dont mind using 2 batteries now for a 24 v system as a buffer.I made all my battery connects with copper "plier" battery clamps.If I am home and want to or need to plug things in to normal inverters I can have "good batteries" for a bank to feed and draw off of..I can switch from a 24v to a 12v system in seconds now..

    I have a coleman??? 3800 watt 144 amp...

    5 seconds is to long for a turbine to spin crazy out of control and I have threw these ponderings because of this out.

  4. timber

    timber WindyNation Engineer

    Yes I agree and didn't even think about the turbine running wild and free for 5 seconds ... definitely want to avoid that.


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