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Picture the scenario – power goes out, the lights go out, and more tragically so does the carbon filter fan. Within 2 hours the whole block will smell like a weed factory. But not if you switch the fan over to a deep cell battery and a power inverter! Depending on the size of the battery it will run a 100 watt fan for about 8-10 hours. When the power goes out, the stress skyrockets.