As I see sometimes people struggling with multiple P1 devices,
Maybe create a topic with different splitters and review them?
I have found these:
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https://smart-stuff.nl/product/p1-bridge-versterker/ (Active, I have this one and it works for me!)
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https://www.tech4ushop.nl/p1h-005.html (via Topic [APP][PRO] Plugwise Smile P1 - Dutch and Belgian Smart Meter Reader - #189 by Gigi9 )
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P1 Splitter - SmartGateways.nl (Passive, This one did not work for me )
Please add your experience / Advice below!