The Differences Between Grid-Tied, Off-Grid & Hybrid Solar Systems
Because of this extra equipment, off-grid solar is more expensive than grid-tied, with the Tesla Powerwall costing $3,000 (or $6,000 during the 20-year lifespan of the solar panels) and a 10kW inverter costing $300-$500. An additional DC disconnect switch is also necessary between the battery and inverter, which adds an additional $100-$200.
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