Power line Pl1000v2

Hi, Tried to connect says password not valid , factory reset both units , have entered,    
   1/      password                 Was not accepted

   2/     router password       Was not accepted

Appears to have strong signal .

I have solar system on barn where I'm trying to get WiFi.

So Solax X1 inverter also in barn, would this interfere?

Barn 50 metres from router in house, too far? Seems to receive signal ok just won't accept password. 
Grateful for help