Hello.
We would not recommend using parts from another source.
It does not, unfortunately.
Hello, it is yes, you already get 10m of cable, but there is a wiring kit to add more wire on. Please look up tsc wire and it will come up in the search bar.
This should be fine
The GEO 3 comes with a charge controller. You need a charge controller with this size of a panel as without one it would reduce the lifespan of the battery.
We don't sell a single unit security light for the geo kit but each part separately. You can make from parts of your choice. You could connect to PIR to a Floodlight like this one. Hope that helps.
We have one here
Yes, you can use any bulb holder, and any 12v bulb.
Yes, you can add any other 12v panel into the system, just make sure you wire them in parallel to the battery.