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That floor and wall is moerse skeef.

You get surge protectors in your DB but you also need surge protection plugs as they each protect against different scenarios.

You can't do it that way. Either read the existing thermostat value with something like an ESP8266 or get a Geyserwise thermostat and again use a ESP8266. Also use a contactor to switch on the geyser.

If any of your devices are POE you can power them simply with a network cable from the POE port without a DC cable, might not need a splitter then.

The selector switch is for the POE lan ports next to it. You would need a splitter that goes into the 12v and gives two outputs.

Try onnet.telkom.co.za, works for contracts not sure about prepaid. You can also sms balance to some number.

You will need an inverter of 1000 watts and preferably two batteries with 100ah capacity and a 10 amp charger. One of those trolley inverters would be the easiest.

If you are into building stuff yourself you can keep the DSC and install one of these. DSC Keybus Interface Or Olarm which is subscription based. Olarm

You need an isolator switch for a fan. Like I mentioned earlier you can have both a switch and smart switch at the same time, the switch will just be override switch but if it's on the smart switch won't work.

Try putting the Olarm on another battery. I only get that error from the remote receiver when I completely turn the power off, mains and battery.

If you want real control look at DSC Keybus Interface

You can simply connect the neutral to the wire you are going to use as the new neutral as long as they are on the same circuit. Does the smart switches have to be wired directly each of them or can you simply wire one and the rest of the switches simply connect wirelessly to the main switch...

The primary switch would have more wires coming in. The secondary switch should have three wires. You can reuse the wires and extend a neutral to the secondary switch.

The only way to get USB3 is through the PCI-e slot.

PCI is too slow to handle USB3 unfortunately.

Bought mine from Builders a few years ago, model Efergy EMS-RSA, but they are all the same.

Looks exactly the same except for the name, R300 a few years ago.

I have an Efergy one that looks identical.

Install a voltage regulator for your house.

Tried it with metal rods but no luck, intelligent little bastards.