Cuberice

I have installed 2 x normally closed contractors (change-over contactors) in my DB that always allow grid power as first priority. Then I use sonoff switches to switch them “on or off” with my phone (eWeLink app) 
The control power of the contactors is powered from my inverter because if I used Eskom power and Eskom would go off, I would loose the ability to control the system. The inverter is always on even at night with battery-power and enable me to switch between grid and inverter 24/7 from anywhere with my phone even when Eskom is down.
I don’t feed Eskom into the inverter at all and only use the inverter as a off-grid only. According to me the contactor switching is also soft on my inverter itself because my inverters internal relays never switch between grid, battery and bypass because the external contactors do that and so preserving the internal inverter relays. If my battery do run to low or trip for whatever reason the contactors just drop back to Eskom and you don’t even realize your back on Eskom, the same when switching to solar it acts as UPS and can switch while computers and tv’s are on.
sorry for long explanation.