I have two sprinkler controllers, one for a lawn and the other for a drip system. The lawn is on the side of the house and the drip controller is inside the garage about 50' away. There are 12 total zones, 8 for the lawn and 4 for drip, and I am looking at installing a wifi controller and would like it in the garage. My lawn controller is 8 zones and there may be another for the main valve and 1 common. Would it be possible using a 10 conductor line to run those 10 wires from the outside to the inside where the other controller is and install the new 16 zone controller there? Will I just use wire end caps or electrical tape to connect the outside lines to the new wires and run it along the outside of the house through the garage and then plug it into the new controller?
Does it have to be irrigation wire or can I use any 18 gauge 10 conductor wire, including thermostat wire? Does the gauge have to be bigger since some of the line is already probably running 50'+ from the valves to the existing controller and I will need to run it another 50+ feet? If it has to be the same is there a way to determine the existing size?
The drip has two commons and the grass has one which leaves me with three, but the Iro only has two. Can I splice the two in the existing drip into one and plug it into one of the two in the Iro and be okay?
Also, is it okay to keep the orbit 8 zone installed since it is hard wired into the electrical fuse box? If I can use wire end caps to splice the exiting wire to my 50' extension wire, I will likely leave it in this control box.
Here are pics of my existing wiring. Thanks