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The average electricity consumption of a US family of four is in the neighborhood of 50 kWh per day, or 1,500 kWh per month. Similar figures apply for Canada. Assuming an average electricity cost of $0.12 per kWh, that translates into about $6 per day for electricity, or $180 per month.
A more practical few-days of storage is that much easier. Although at approximately $150 per kWh of storage, three days of storage for the average American house will cost about $15,000 to cover electricity demand, with the cost recurring every five years or so. 100 A-h battery can put out 1 A of current for 100 hours, or 10 A for 10 hours, for instance (though the rating typically declines for high currents). The electrical power exerted by the battery is just the current times the voltage.