Very possibly, yes. That’ll depend on how long you run the route for, how power hungry the app you are running might be, how many other ‘must have’ apps you might have running in parallel, how hot or cold the day is, the capacity (and state of health) of your phone’s battery and / or the phone itself.
As you will have to power the unit, you might as well power your phone at the same time. But, until then, try it and see for yourself.
Currently I run a WunderLINQ system with the phone on a wireless quadlock charger, so the phone is always charged. Only downside is side brightness in full sun and my failing eyesight.