Currently doing that. Totally possible. I don't even use the same model but they are all from TP-Link.

Just add the additional powerline adapter using the tpPLC app.

Wait, you can't have 2 powerline network in a home I afraid.

You can have multiple powerline adapters but they will be just 1 network.

Thanks for the explanation.
By the way how to test whether it is single phase power?

The data is gong through the powerline then broadcasted. It is not repeated. However, powerline is very sensitive to electrical noise and any electrical noise will affect the data transmission rate.

The wireless powerline is basically a wireless access point relying on the powerline connection for backhaul.

So the link speed actually depends on the powerline connection.

Powerline link speed is affected by various factors. (3 phase, distance between powerline adapters and power equipment)

You got it the other way around. The single port should be connected to the Router and the one of the 3 ports to your PC, assuming that you are trying to get LAN connection to the router, but unable to do so, because of wiring.

Yes, you can but why would you want to do that? Powerline adapters are reversible.

If you want to add ports to your router, get a switch. The wireless powerline should be used at the place where you want to boost the signal.

Not possible for powerline to be used for Hypptv if it is used for Internet already. You have to choose either one. See above for bro ppfoong who confirmed it.

Gigabit powerline is unnecessary if your connection does not reach 1000Mbps, or 1Gbps speed. You can buy that as it is better than AV500 powerline, but won’t make much difference for speed.

What router you use now?

The new powerline should be able to reach 100Mbps if you are lucky.

Your new powerline should be better, but not sure if you can still get full speed. The best thing for you is stil a direct wireless connection to your router. Would recommend you get a better router with strong coverage. I would recommend the TP Link AC3150 v2.
It is possible, but you need to be connected to 5GHz, assuming that you area is congested and have interference from other wireless AP. The TP C3150v2 would be more than enough for you bro.

I got same issue! Got a Tp extender , it show full bar on my iPad but actually the speed can say close to turtle!