When a second battery is added to the vehicle, ie. camper van conversion etc, the Smartcom relay will allow charge through to the second battery, directly from the main battery. Charging will only take place when the engine is running and the batteries will be isolated from each other when the engine is switched off. There is no need for alternator connections as the relay goes directly between the 2 batteries. These relays are generally used in conjunction with a caravans 12S socket to allow power & charge to the caravans electrical system when traveling.
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