@MirkoCpn The problem is as described the combination of PIR/Battery/power consumption, this is what you end to if you want a battery operated camera. As being installing intruder alarms for 30...

The only reasonable way is to supply the cameras with one let`s say a 10Amp (10cameras) 12VDC power source. Yoy can cable it in star or bus (or both) and convert it to 9VDC just before the camera. To...