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The Enerwatt EWC 148 Automatic battery charger has built in ultra-low power consumption circuit and operates with very high power efficiency. This charger will automatically go into ECO mode when battery is disconnected.
The EW-420USB Power Inverter converts low voltage, direct current (DC) to 120-volt alternative current (AC) when connected to the 12 V outlet in your car, truck, RV, or directly from a dedicated 12 V battery.