Question 1

What is the difference between the 300 and 500.

Accepted Answer

The difference relates to the data transfer rate over the local link, the higher speeds would be useful if you were transferring a lot of data over your local network, such as transferring files between devices, notice I say local and not internet, if you're just using it to access the internet from a mobile then you don't need the 500.

Question 2

How do you use this with Ethernet cable for one device and as a wifi extender as well in a wifi dead spot area?

Accepted Answer

I have the main unit cabled into the router in the lounge. The second unit is set up in the Loft/Office with the main PC and NAS box cabled into the ethernet ports, the works laptop use the wireless connection. I used to have a very weak signal in the bedrooms before, but now they have a very good signal. Once you have syncronised the second unit to the main unit everything is automatic. Hope that helps.

Question 3

can additional extenders be added? So one base unit wired to the router, and have several extenders throughout the house?

Accepted Answer

Where do you purchase an additional homeplug? I need one more but don't really want the kit as I have the base unit already.

Question 4

Can you connect other version's of a tp link powerline adapter to these?

Accepted Answer

You can, but with caveats. I had a pair of existing 2,000mbps 2 port plugs set up (TL-PA9020PKIT). One next to my router, the other in my office. They work great, and I had full 2,000mbps speeds. 
I bought this kit to extend wifi up to the loft and out to the garden, not really fully realising there was a non-wifi master, and a secondary wifi slave. So there is only one Wifi extender in this pack (TL-WPA7510KIT)

It took me a few attempts, but I have now managed to get all 4 sharing my single network across 4 rooms. The trick seemed to be pairing them in a string sequence, not all to the first one in the router. 
So I had the first non wifi one plugged into the router, paired with my other non-wifi one. Then I paired that second one with the new master of the wifi kit (which is just a single port 1,000mbps , no wifi). Then I paired THAT one with the wifi extender one. Finally, I cloned my wifi settings on that last one.

The downside is that my 2,000 network is now running at 1,000 because it all has to go at the speed of the slowest part in the network. 
And the wifi is only extended towards the garden, not towards the loft, because only one half of the TL-WPA7510KIT is actually broadcasting wifi.

Otherwise it's pretty plug n play. I seem to have to re-pair them after they've lost power. But now I have the knack, it's simple.

ASIN	B08QSK84JL
Best Sellers Rank	1,356 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 6 in Powerline Network Adapters
Box Contents	2× Ethernet Cables, AV1000 Powerline Wi-Fi Kit: TL-WPA7617 & TL-PA7017P, Quick Installation Guide
Brand Name	TP-Link
Color	White
Compatible Devices	HomePlug AV & AV2 standard powerline adapter compatible devices
Compatible Operating System Family	Windows
Country of Origin	China
Customer Reviews	4.3 4.3 out of 5 stars (1,866)
Data Link Protocol	Gigabit Ethernet
Data Transfer Rate	1000 Megabits Per Second
Hardware Interface	Ethernet
Item Dimensions L x W x H	7L x 5.2W x 12.4H centimetres
Item Weight	660 Grams
Manufacturer	TP-Link
Manufacturer Part Number	TL-WPA7617 KIT
Minimum Required Operating System Version	Windows 7
Model Number	TL-WPA7617 KIT
Product Warranty	3 year Manufacturer
Unit Count	1.0 count

TL-WPA7617 KIT AV1000 Powerline Adapter, AC1200 Dual Band WiFi Extender, Gigabit Ethernet, HomePlug AV2, Powerline WiFi Kit, Ethernet Over Power, WiFi Booster for Home

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