We have tried to use Global Link 520 with solar (+batteries and SmartSolar 100/20 ) for an Osprey nest camera.
We already have second unit because the first was not functioning: it did not cut the power.
Well, we returned it and got a new one: same thing. Does not cut the power.
We would need this function because here in Finland the sun is not enough strong to keep the router and camera 24/7 on...and the router/camera needs to be booted once a while.