Well, I can’t really imagine what would happen
The biggest inconvenience – and even a potential hazard – is when the roller shutters are closed; I haven’t yet come across a customer who used a battery backup for centralised roller shutter control – although it would be a practical solution, the thing is that you’re talking about backing up the control system, not the actuators – so my example was a bit off the mark
So, what is this UPS supposed to power in the system (I’ll leave out the alarm, which is obvious, and CCTV could also be included, but that’s a broader issue, and rarely used in a detached house), when there’s no mains power and we won’t be able to use:
lighting, any other appliances connected to 230V sockets, roller shutters, heating (where heat pumps, gas or oil-fired boilers, or electric heating are used), gates, side gates, sprinklers, water pumps, etc.?
Could you give some examples? I’m currently in the process of selecting a buffer power supply, but only for the alarm system; with an IB system, it’s not easy to achieve a satisfactory backup time; if additional building services were to be added by then, phew

we’d have to build a second plant room.
Best regards.