Ah, UPS data 'towers' (equipment 'racks')... All good things come to those who wait. Out of context of the original conversation (?) or I am just getting slow witted... 🤔
Not just racks..Those are king sized battery back ups.
Maybe overkill to store electricity to run household appliances but the people my acquaintance bought his house from did just that and he got them with the house.
of course there are more pedestrian ways to save solar energy at reduced cost.