By bargain shopping and buying used equipment, he got 30 x $50 of solar panels, 14 kWh of batteries (about $800) an inverter to charge the batteries, and a $1400 inverter to supply battery output, he's able to add 17 miles range per hour of charging.
That's about $5K in costs, or the equivalent cost of fully charging your Tesla 50 times at current $0.10/kWh utility rates.
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