@RobLewis you just need one more device and it will sync up to the existing pair. Probably one of the "mini" models that only have one port would be best if you just need it for the one solar battery...

@Saviyon Do you have a laptop you can plug in place of the xbox to do more advanced investigating? Or a friend who has one you can use? Sorry, I can't help with xbox but if you have a computer we can...

@Bezzinina Sounds like something is definitely not right with your ping speed. I ping google at 18ms average, 20 max, 15 min. This is from my PC to an 8 port switch, then to a powerline AV2000 to...

@Writhdar There are a lot of "it depends" in your question, unfortunately. Wifi extenders can interfere with the main router if they are on the same channel. They should be set to another channel but...

@turboracer1320 When you say different panels, that is probably the key. Depending on how the panels are wired, jumping to a different panel frequently does not work with powerline networking.

@Bulkhead The powerline system is a standard, so brands can be mixed. I currently have TP-Link devices plus two other brands, all working together. So, use whatever you can get. That model you have...