Using a CT Coil
- Keith Gough
- May 26, 2020
- 1 min read
Basic understanding of using a CT coil it is used to control the export or import of the power from the grid this is very important and care must be taken when using CT, to ensure it is wired correctly

Note Black is NEUTRAL
Hi Keith
My 5kw Inverter works very well 2years. The DB9 Wi-Fi unit however just stopped working one day about 10 months ago (No Lights on. I am unsure if it’s the Wi-Fi unit or the port. I am reluctant to ask for a friend’s unit or to try mine in there Sunsynk in case the fault cause damage on their units.
Any Thoughts
PS!
I am now in the process to see how well “Home Assistant” will work with the Sunsynk.
Hi Keith. My friend just installed his 10kw Single phase inverter and all works well except the CT does not respond at all. (White on 3 and Black on 4)
Looks like there is another CT connection open on 5&6
Any Thoughts?
Is it possible to dispense with the CT and multimeter in integrating the 3-phase 12 kilo infrared unit while connecting them to gel batteries and the diesel generator?
Hi Keith
I am trying to follow all the helpful comments and tutorials from yourself. I am not an electrician minded at all and getting lost in jargon.
Recently had 3.6 inverter installed with 4.8 kW battery. My battery is charging well but the house continues to use the grid for its supply and not the limit of the battery. My electric consumption remains the same as before I had the new inverter and battery. How do I utilise the battery which is charging well but the house even at basic standstill (not occupied - just usual fridges, TV etc) not utilising its charge?
Thanks in advance, Mav
Hi Keith, can you help please. The CT coil is fitted and working but the reading is not correct, it's consistently feeding 190 - 210w back to the grid but the Sunsynk inverter is not identifying this and over reading the load by the same amount. For info the distance of the CT from the inverter is approx 40m. Is there a way of adjusting the readings to compensate for this. (I've tried adjusting the ratio). Many thanks