Partial System on Generator

Remodel will have ra2 in new areas and old. Client wants backup gen panel to control emergency loads and lights/keypad in kitchen. Main Rep will be on backup gen but possible aux rep will not. What would be the problems, if any, if only the main rep and kitchen have power. I'm not concerned about the lights in other areas that have no power. More wondering about communication loss because of the aux not having power.

Won't have any issues. 10 non-volatile memory. May have issues with LED logic upon reinstatement of power, but it will sort itself out once the homeowner starts pushing buttons again or timeclocks fire. Just keep the main close to the area on back-up.