It would be quite smart if this battery only runs on a single power group. You could get like 2 or 3 of these and put them on your most important power groups. But you disable the power groups of nonessential but heavily consuming devices such as your car charger, heating, washing machine, or drying machine.
That way, three small batteries that only power part of your house would be cheaper than powering your entire house.
That way, three small batteries that only power part of your house would be cheaper than powering your entire house.