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Intellitec’s Bi-Directional Isolator Relay Delay (BIRD) offers a new approach to charging batteries in an RV application. Unlike prior systems that only allowed charging the RV battery from the engine’s alternator, the Bi-Directional Isolator Relay Delay charges both batteries when either one is being charged. When the coach is being driven, both batteries will be charged from the engine’s alternator. When the coach is plugged into shore power, both batteries will be charged from the converter. If neither battery is being charged, the batteries are fully isolated. The controller also senses heavy loads on either battery to prevent the wrong battery from being inadvertently discharged.