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So just had a Zappi installed recently with the HARVI. I have an Immersun diversion unit that was already in place that diverts excess to the hot water tank.

As the Zappi is not actually talking to my Immersun diversion unit I am wondering what the priorities are if my BEV is plugged into the Zappi with the setting enabled to use excess PV.

Does the Immersun operate as normal and take precedence for PV diversion to the hot water tank?
 

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You can fit an extra Harvi CT around the feed to the Immersun, and then configure the Zappi to treat either itself or the Immersun as priority. Without that, I don't think it's predictable what would happen at any one time.
 
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