After a few bad experiences with smart switches on high loads, I decided to give it one more try so with my list of requirements I went looking, and I found this.

Here : https://www.takealot.com/geyser-smart-wi-fi-switch-energy-monitor/PLID93647687

Some features.

1.       Din rail mountable

2.       Single slot

3.       High Load 63A

4.       Sonoff app integration

5.       Monitor Power and energy

There and many similar devices out there, the reason I liked this one is that it is single pole for the live wire, and a small wire that you connect to the neutral bar. Keeping the DB board neat and installation simple.

One note of caution, when the unit is not receiving current e.g. during load shedding or when you run out of pre paid electricity, it will open the circuit, I had installed these on almost all the outputs from the DB board including where I had the keypad for the prepaid meter plugged in, so when I ran out of prepaid, the circuit opened and there was no way for the keypad to communicate with the meter.

For the price (+- R700 ) it is a simple reliable way for you to monitor and control your high load devices , I have 11 of these installed in various DB boards around the house and they have been working flawlessly for over 6 months now, I can recommend this device.

I have a similar unit but from a different vendor (Tomzn), bought from Aliexpress. I use it to manually disconnect my inverters from the grid - and it has also been working absolutely reliable.

Also have the tomzn equivalent, works great, and was very cheap at under R200 each 

https://a.aliexpress.com/_EGGoepr

Works perfectly, imports into home assistant easily as well. I wouldn't push it to 63a but for a 4kw geyser it works fine. 

Edited November 24, 20241 yr by abd7

Hi all. I have used it successfully for a long time. Today I got a message that there was a new firmware version for it. I installed the new version, and now the switch does not work correctly. Anyone have similar issues?

@Rello if you are monitoring in Home assistant using the AlexxIT / SonoffLAN integration to monitor i found this on the GitHub page

Seems to start updating if i open the eWelink app on my phone.

Am busy looking into how to flash to Tasmota for these devices.

Edited May 13May 13 by regbes

For anyone wanting to run things locally on home assistant without the cloud, smartpad have quite a few options and their service is exceptional.

https://store.smartpad.co.za/index.php/product/esphome-smart-controller-energy-monitoring/