The number of Powerwalls needed to power your home largely depends on the amount of power required. Smaller homes can get by with 1 Powerwall, whilst homes with larger appliances may require 2-3.
In optimal conditions (around 8kW of solar power) and no loads, the Powerwall could be charged in under 2 hours. Charging times vary depending on the weather conditions and if the Powerwall is being used at the same time.
The Tesla Powerwall 2 battery is a Lithium NMC (Nickel Manganese Cobalt) and has double the capacity and triple the power output of its predecessor in the Powerwall 1.
Number of solar panels required is worked out on a case by case basis.
In some instances, only one solar panel is required but for the majority it is around 20.
The short answer: yes. The long answer: is it really a good idea? Whilst it is possible to go off-grid with the Powerwall, the costs associated may put some people off. In most cases, it is more cost-effective to remain on the grid with your own solar and battery solution.
Tesla currently has no plans to develop or produce a Powerwall 3. Demands for Powerwall 2 are already high that waitlists have been formed.
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