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How Long Will 500kWh Power Street Lights?

Let's tackle the burning question first: How long can a 500kWh battery run city street lights? The textbook answer seems simple enough. Imagine a mid-sized city using 100 LED street lamps rated at 150W each. That's 15kW total load (100 x 150W). Divide 500kWh by 15kW and... voilà! You get roughly 33 hours of runtime.