zedwunare

Thanks for the further update. Funny I had the idea some other loads could have caused the high reading before and now. Normally the geyser will have a draw over time depending on the amount of hot water used. For showers the time it takes to reheat can be short.
In this case only you can guess what other loads could cause this.

Update : I ended up needing to replace the element and thermostat on my geyser (coincidental failure - it has worked fine since 2014 without a hiccup). 
After that, I also moved the clamp to a different area of my Eskom feed and immediately after I was seeing a draw of 3kw while the geyser was heating. It was likely clamp placement I am guessing. Thanks for the input. 
My new problem is that my efergy engage hub is just not showing as connected at all and their support team are referring me to a data queuing issue on their side which frankly quite ridiculous as I haven't been able to properly use my efergy engage for more than a week now. Oh well.
I suspect my solar install is going to be massively overkill as my estimates were based on high utilisation but I'd rather over-bake it and be less reliant on Eskom than more so.

During your wife's cooking the usage (including 2kw of the pool pump) is about 11-13kw non-stop for over 2 hours, that is a hell of a lot of cooking.
Does this sound right or is EVERITHING maybe somehow measured double?

Even the 8kW from 6.30 to 7.15 seems way too high for a geyser.  The up and down must be some other loads. The power measurement seems very weird.
15kW is over 60A?

Technically it is possible to clamp around the a neutral wire that happens to have current flowing in the same direction. 
It would be similar to forming a loop and putting the same ware twice through the current clamp. Grasping at straws... I know
Personally I would say that the effergy is faulty/badly calibrated (maybe has a voltage sense resistor that is off-spec).
 
My way of testing this would be to take a reading outside at the municipal meter at say 8am and again at 9am(when the geyser is running). Calc the consumption and then compare to the consumption as reported by the effergy for that hour. They should be within 5% of each other

Yes in a DB it would be possible as you describe it. However if the 2 leads through the loop go to the load and both from the source to the load enters the clamp from the same side like in a cable the current in each wire is of the same magnitude but in different directions to read zero.
So yes one can get double or zero if not a cable to load. Not easy to get the 2 wires to the load through the Jaws of the clamp
So 1st rule is only 1 wire through the loop. Not aimed at you but for those that start using a clamp meter.

Check your Efergy settings in the software. Perhaps your voltage is incorrect. The Efergy measures current and then calculates power according to voltage you have given it.

Willing to guess that you probably have the voltage on the Efergy set at 110V which would explain the HUGE power usage 🙂 

Would the 14A of a 3kW element not then give 50% as in 1540W 🤔

@Scorp007 Yup, you are correct, hmmmm, no 400V setting on a Efergy, lol
 

Good that at least you are now seeing the correct draw even if you had to change the element and thermostat. 
Still puzzled how the clamp measured such a high draw. 

Mine draws straight 3000w (displayed on a Sunsynk 8kW) upon starting. 
Check the amp draw with a clamp meter.