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Pay for what? You'd probably have a home charger anyway?
Smart electronics that can adapt to electricity cost and demand earn themselves back quickly. The powerwall is a battery on top of that what makes it expensive, but even those do earn themselves back over time.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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