Blue Sea 7605 BatteryLink Charger

The BatteryLink® Charger is a 120VAC nominal input, 12VDC nominal output, 10A battery charger with integral battery combiner (ACR) providing a second battery connection, as well as standard ACR function when AC power is not present. 

Automatic Three Stage Charging 

The BatteryLink® Charger uses a three stage automatic charging profile. The three stages are referred to as bulk, absorption, and rest/float. The charger will move between these stages automatically, with no user intervention. When the charger starts, it goes first to the bulk stage. This is where the first 75% ? 80% of charging takes place. It is a constant current mode, in which the charger outputs as much current as it can to drive the voltage of the battery up to the absorption voltage. Once the absorption voltage is reached, the charger enters absorption mode. This is a constant voltage mode, in which the battery is held at the absorption voltage to complete the last 20% ? 25% of charging. In the absorption stage, current will decrease according to the Batteries? needs plus any additional current required for active loads. The length of time spent in the absorption stage will vary based on battery type, battery capacity, and the presence of loads, but will be a minimum of 1 hour up to a maximum of 5 hours. After the absorption stage, the charger will move to the rest/float stage. The float stage is a constant voltage mode intended to maintain fully charged batteries while supplying current for loads as necessary. The rest mode is included as an energy saving mode, and for compliance with California Energy Commission (CEC) requirements. In the rest stage, the charger output and ACR are turned off to conserve energy, and the battery voltages are monitored. If loads or self-discharge on either battery cause the voltage to drop to 12.9V, the charger enters float mode for 4 hours in order to maintain the battery and supply current to loads. After seven days of continuous rest/float mode, the charger will repeat the normal charge cycle to assure good battery health. Battery Temperature Compensation Battery temperature compensation is output voltage regulation based on battery temperature variances. Since batteries can see extreme temperature differences, it is important to regulate output voltage with temperature to maximize battery life. A battery in a cold environment should not be charged at the same voltage as a battery in a hot environment. The BatteryLink® Charger is set at a baseline of 25øC. If the included battery temperature sensor is installed, then every 5øC variance from this baseline will result in a change in output voltage. Voltage will decrease at higher temperatures, and increase at lower temperatures. The temperature sensor also allows the charger to react to extreme hot or cold temperatures (below 0øC or above 45øC) by reducing output or shutting down to preserve the battery. Reference the Installation Instructions on page 6 and the Full Installation Diagram on page 8 for details on how to install the battery temperature sensor. 

Automatic Charging Relay (ACR) 

The BatteryLink® Charger includes an integrated 65A Automatic Charging Relay (ACR). The purpose of an ACR is to combine batteries for charging, but leave them isolated for discharge. This works well with dual battery systems, where non-starting loads are isolated from the engine starting battery to reduce the risk of being stranded on the water without enough power to start your engine. The ACR in the BatteryLink® Charger will combine the auxiliary and start batteries at or away from the dock. This means both batteries will be charged during AC powered charging, or when AC power is not available and a secondary charging source is active, such as your engine?s alternator. The ACR includes an optional Start Isolation feature, which can be used to prevent engine starting current being drawn from the auxiliary battery. Start Isolation protects sensitive electronics wired to the auxiliary battery from being affected by voltage sags or spikes caused by engine starting.