How many 12 volt battery's would it take to run a whole house?

The number of 12-volt batteries needed to run a whole house depends on the house's energy consumption, typically measured in kilowatt-hours (kWh). For example, if a house uses 30 kWh per day, and assuming a 12-volt battery has a capacity of around 100 amp-hours (which is roughly 1.2 kWh), it would take about 25 batteries to meet that daily usage. However, this calculation doesn't account for efficiency losses or the need for reserve capacity, so the actual number may be higher. Additionally, the specific appliances and their power ratings would also influence the total battery requirement.