Calculating voltage drop (and power requirements) for multiple devices
You can use online calculator tools for that, a 150meter 0.75mm2 cable 1A would yield a voltage drop be about 10V which is basically unusable.

It is not a good idea to power devices over long cable using small voltage / high current. 

The correct approach is to have 110/230VAC over the cable and then at each location to have a small 12VDC power supplies (those are dirt cheap).