The availability of the Tesla Powerwall battery was just announced and it became immediately very popular because it is believed to be a cheap solution for the residential sector to save money on the electric bill with short payback times. The purpose of this paper is to analyse three scenarios in which the Powerwall can be used with the goal to determine which of the scenarios is the most attractive to invest in. Two countries were chosen for comparison namely the United States of America (California, Hawaii and Alabama States) because it is the main market for Powerwall and Portugal (Aljustrel city) as a comparison because the billing system is very different and a solution like Powerwall can take advantage of this billing system. The results show that an off-grid PV system in Hawaii is the can triple the profit in the investment over the 25-year period and that charging the Powerwall battery from the household grid in California can double the profit on the investment over a 25-year period. The results for Portugal are not attractive in any scenario and the on-grid scenario for Alabama is also not viable.
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