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Hi Steve, unfortunately CT2 doesn’t quite work the way you describe - CT2 is an external generator and is always negative (or zero, it will not go positive) and most importantly It’s a load side effect so when added to the load it reduces the size of the load and any surplus is export. If you fitted it to the Zappi, it would firstly need to be reversed so it sees charge as generation but then the inverter sees the Zappi charge as load as well so you will have effectively doubled the problem as there isn’t a -ve generation to reduce what the load CT is reading. You’ll be better either putting your zappi on a Henley block by the meter in front of the inverters Ct clamp or if possible move the Ct clamp so it doesn’t see the zappi load (the zappi still sees export and functions normally) |
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Thanks Fozzie, |
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Hi,
I was looking at the possibility of using CT2 to monitor my EV charger to prevent the Fox batteries discharging to the car (during off-peak times only). My understanding (and I may be wrong) is that CT1 & CT2(negative value) are added together to determine how much is left to charge the Fox batteries.
Assuming this works, it would be quite straight forward to wire this up and activate CT2 through the inverter panel but....
I would like to only use this function only for off-peak charging. Would it be possible to add an inverter toggle switch to CT2?
I have a Zappie for my EV and it needs 1.4kW from solar before it starts to charge. By toggling CT2 off, I can use the fox batteries as a 'float' when it drops below the threshold for a short time (I have automations for Zappie that gives the operating window). This would help reduce the constant switching off & on due to a minor short dip in solar energy.
At night, I don't want the inverter to see the off-peak charging at all, so I would toggle CT2 on.
Hope this makes sense
Steve
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