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    #31
    Originally posted by pv_n00b View Post
    Grid-tied inverters are designed to convert DC to AC and move it on. They are not designed to curtail the output based on the needs of the AC loads as an off-grid inverter will do. So if we put a grid-tied inverter in an off-grid situation and there is not enough load to absorb the inverter output that current will go somewhere it is not wanted. Where it goes and what it goes through depends on the weakest link on the AC side. If something on the AC side does not fail, eventually the inverter will raise the voltage high enough to trip itself off line as it tries to push current into the loads.
    Most aren’t. The way the Sunny Boy / Sunny Island combination works is the Sunny Island acts like the grid both as a source and sync — a GTI doesn’t much care. When the Sunny Island “decides” the attached batteries are approaching full, it changes its output frequency. This magically signals the Sunny Boy to reduce output.
    Julie in Austin

    Born to brew, forced to work ...

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      #32
      Originally posted by tallgirl View Post
      Most aren’t. The way the Sunny Boy / Sunny Island combination works is the Sunny Island acts like the grid both as a source and sync — a GTI doesn’t much care. When the Sunny Island “decides” the attached batteries are approaching full, it changes its output frequency. This magically signals the Sunny Boy to reduce output.
      The Sunny Boy is controlled by the Sunny Island. Left on its own it will act like every other grid connected inverter and just pump out all the power that it can and that the array can supply. There are a number of systems that use a controller to control standard grid tied inverters one way or another to make them play nice in an off grid situation.

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