EV charger showing double watts

I live in the US and have a Tesla wall charger charging at 11kW on a 60A double pole breaker. I used 1 50A CT but it shows 22kW (doubled). How can I fix it? Thank you.

Can you post a picture of the CT as installed and a screenshot of the input setup please?


The Tesla app would show 11 kW charging speed, so was wondering why iotawatt was showing 22 kW

You have it configured as a 200 Amp CT but you say it is a 50 Amp CT. So configure it as a 50 Amp and check double in the setup.

That fixed it, thank you!

Sorry, shouldn’t the main_1 and main_2 add up to the total kW? It’s showing 11.5+11.5 kW but the total usage is 11.1 kW from the charger (ignoring some smaller devices in this calculation).

Looks as if the mains may not be configured correctly as well. What CTs are you using and post your inputs setup menu.

I didn’t connect CTs to every circuit since space was an issue, but I connected them to high usage ones like the range and EV charger. Also, I noticed that I incorrectly configured the main 1 and 2 to be 200A when I used 100A CTs on them, so I fixed that and now it looks like the below. What watts should I be expecting for main 1 and 2?


“What watts should I be expecting for main 1 and 2?” - Not sure what question you’re really asking, Nashi. Trivial to say your main_1 and main_2 should reflect the current power drawn on each leg of your 240V service. So with all loads off except for your EV charger, you’d expect to see approx. 5500W on each - assuming the charger is pulling 11kW at the time. But maybe you were gettng at something else…

I can’t make out ant details due to the low resolution of the picture, but it appears that the panel doesn’t contain the main breaker. It’s probably in an upstream panel. Based on the apparent size of the feed cables, it looks like a 200A service. You say those are 100A CTs which would probably be a tight fit over the cables and possibly not even closed all the way. You have a 200A CT configured for your washing machine, which is no doubt overkill although I don’t see it in the picture. If you got the standard 120V kit, the 200A should be on the main feeder cables. You have what appear to be 240V circuits configured with one 50A CT but not doubled in the setup. You need to study the docs to determine if that is appropriate or if you need two-CTs or another of the strategies explained there.

TBH it appears you may be over your head with this. IoTaWatt isn’t a simple plug-and-play video toy like some others. It can do more but you have to have a working knowledge of split-phase electric wiring.

Maybe you could find someone to help you out.