[quote=SanDiegoDave]Batteries? Seriously? It didn’t occur to them to, oh I don’t know, design the meter to use the power source that is connected to the device? LOL![/quote]

it’s kind of dangerous to hook up anything
to the meter side power demand because it’s not
fused and it’s subject to massive surge.

if you inductively couple the surge is bad.

if you are wired in direct you are looking at 35,000 amps instantaneous short current to protect against.