I am looking at adding sensors to a detached garage, it is about 650-700 ft from my house.
Is it possible for Power G to work this far?
Is it possible to run underground wire this far?
Also can I have 2 separate systems? If so how does this work with the app?
Yes, Power G is a potential option. The open air range of PowerG on the IQ Panel 2+ is around 2000 feet.
Wiring might work, but it might be prohibitively expensive, and I would be concerned about resistance a bit at that length, depending on the wire quality.
You could have two separate systems, but that would mean two separate subscriptions and Alarm.com accounts. There is no reason to pay double for this circumstance.
I would definitely go PowerG, however note that it looks like based on ADC reports that you have an older IQ Panel 2, not the IQ Panel 2+. If accurate, your panel does not have a PowerG radio.
If I upgrade to a Power G panel my understanding is that my image sensors will no longer work, is this correct? Do they make Power G image sensors? Also, is it possible to have the garage and home as 2 separate partitions so garage can be armed while house is disarmed?
If I upgrade to a Power G panel my understanding is that my image sensors will no longer work, is this correct?
That is correct, the panel only supports either Image Sensors or PowerG. The PowerG IQ Panel 2+ would not support ADC Image Sensors.
Do they make Power G image sensors?
Yes, there are PowerG replacements. Look at the PG9934P and the PG9944.
Also, is it possible to have the garage and home as 2 separate partitions so garage can be armed while house is disarmed?
Yep, the IQ Panel 2+ supports partitions, which would allow you to arm the garage and home independently on the panel or via Alarm.com.
With the PowerG image sensors how many can have installed? Also can you still do peek in requests for images?
Up to 5 image cameras, and yes, peek-in-now is supported.