Discussion in 'Windtura Generators' started by Bootstrap, Apr 13, 2011.

  1. Bootstrap

    Bootstrap WindyNation Engineer

    (SUN-300G_WDL) purchased 2 of these inverters for my 600 watt 24 volt wind generator. I bought them because they had a dump load built in. Now I got them and as it turns out, I have to hook up some dump load resistor it. It is rated for 10.8-30v. What will happen if I don't get this dump load resistor?
  2. minermike

    minermike WindyNation Engineer

    It won't have anywhere to dump the excess power.Probably over charge your batteries and blow them up at the least.
  3. Bootstrap

    Bootstrap WindyNation Engineer

    I dont have any batteries. These are grid tied inverters. I suppose I could dump into a battery...
  4. windyguru

    windyguru WindyNation Expert

    You really should use a dump load.

    Once your turbine's voltage climbs too high for the grid tie to handle, the grid tie switches the turbine's power to the dump load.

    You need to use a dump load so your wind turbine does not spin out of control when you are in dump load mode. No load = one very, very fast scary wind turbine.

    Plus, it seems like the way your grid tie works, it will not switch back to grid tie mode until the voltage of the turbine drops back down to the voltage operating range of the grid tie. If you have no dump load to brake the turbine in DL mode, then it will take a long time for the turbine's voltage to drop back down.
  5. Bootstrap

    Bootstrap WindyNation Engineer

    I was thinking of hooking up a completely dead battery to the dump load. This battery won't hold a charge...what does anyone think of that?
  6. Bootstrap

    Bootstrap WindyNation Engineer

    also, I purchased 2 of the 24 volt, 300 watt dump load resistors....until those get in, I was thinking of using a dead battery for the dump.
  7. Bootstrap

    Bootstrap WindyNation Engineer

    I have a 1200 watt 28v-55v powerjack inverter. What would happen if I ran the dump load from the 2 sun-300g inverters to the powerjack inputs? Would that work?
  8. windyguru

    windyguru WindyNation Expert

    I think that would work.

    I believe that is what Murray and Larry are doing: Stacking their grid ties. I am sure one them will post to confirm this.
  9. leamywind1

    leamywind1 WindyNation Engineer

    Yes it would work but i do not advise on doing it. It does not yeild good results. if it is all you have then you must have something in place before the 60v to protect the system for frying the 28-60v inverter. I recommend a 48v battery clamping method.
    Hope this helps :D
  10. murray2paddles

    murray2paddles WindyNation Engineer

    Whoops, I fried my 1200 Power jack doing this same thing ! Your set up will be similar to some of our most successful . Your resistor order will have arrived probably before you could take action on any of our suggestions but I will leave you with a few thoughts anyways .
    When wiring your two inverters make sure they each have their separate neg., pos. wire from the rectifier or bus bar. The MPPT on these inverters work very well in holding down turbine volts and allowing higher amps to build . We found using the dump load on a grid tie meant you were possibly dumping usable watts down the drain. The whole purpose is to keep the inverters functioning / producing continous watts, so we also used a 24 v battery bank wired parrellel from the rectifier or bus bar with a blocking diode installed. This method also aided in clamping the turbine to lower volts and in high winds keeping the delivery of watts flowing, not dumping.
    By using the battery clamping method we did not experience large decreases in watt production as others may have.
    Then there is always information on furling mount systems that can be setup to aid in the control of total volts production.
    If any of this is interesting and you have more questions please post or write to either Larry or myself using the PM option of the forum and we would be happy to help .
  11. Bootstrap

    Bootstrap WindyNation Engineer

    I got my resisters in the mail, hooked them up.

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