There is no “universal” connection point, as it varies from vehicle to vehicle. For all other alternator systems, it should be left either unconnected (or, even better, grounded to stop it accidentally contacting anything else). The blue wire only needs to be connected to ignition when the BCDC* is installed in a “smart” alternator system. *large capacity battery banks may require a few cycles to fully charge. The dual input BCDC*D range is suitable for all vehicle alternator types This ensured that the REDARC BCDC* with another “D” on the end could ensure that even in “smart” alternator vehicles, the aux battery could be 100% charged.* REDARC overcame this problem by re-purposing blue wire of the BCDC* to be activated by vehicle ignition to over-ride the low voltage cut out while the vehicle is running. This lower voltage (often as low as 12.3V) was too low to charge deep cycle batteries at all and was below the automatic turn off voltage of the BCDC*, meaning that the voltage sensing suitable for previous vehicles could no longer be relied upon to effectively charge the aux battery. See: New vehicle technology affecting dual battery performanceĪround 2011-2012, vehicle manufacturer’s, seeking to decrease fuel consumption and emissions (in line with ever tightening environmental targets) determined that one contribution would be (after ensuring the starter battery was sufficiently recharged) to significantly reduce alternator charging voltage, thus reducing alternator load and therefore reduce engine load to help meet those targets.ĭo you have a “smart” alternator? How do I know if I have a Variable Voltage Smart Alternator? The original BCDC* chargers were designed to, via start battery voltage sensing, automatically switch on when the vehicle was running and switch off when the vehicle was not running, effectively acting as a battery isolator, ensuring that camping equipment Etc did not flatten the starter battery. To overcome this problem, REDARC developed the BCDC* ( Battery Charger from Direct Current input) range of in-vehicle 3 stage battery chargers to ensure recreational aux batteries had a 100% charge, tailored to different types by selectable charging profiles. were not running as long as they had with Fixed Voltage alternators. When Temperature Compensating alternators started appearing in the recreational automotive market in the early 2000s, it quickly became apparent that deep cycle aux batteries were not being fully charged (in many cases, not much more than 70% SOC in normal use), meaning camping equipment including fridges and lights Etc.
When deciding whether to charge direct from a Fixed Voltage alternator or via a DC to DC charger, you should check: When a REDARC BCDC charger recognises the battery aux is fully charged, it drops to lower float voltage (13.3V). A fixed voltage alternator can charge your aux battery at 14V or more all the time you are driving, but most battery manufacturers recommend a lower “float” voltage.A REDARC BCDC charger limits the charging current to a safe level and the size BCDC should be chosen to suit the battery manufacturer’s recommended maximum charging current. Charging direct from an alternator or through an isolator does not limit the charging current and it is possible for the aux battery to be damaged by being charged above the manufacturer’s recommended maximum current.
BATTERY ISOLATOR RELAY AC DELCO FULL
While a BCDC* is not essential (as the voltage produced by a fixed voltage alternator is high enough to give a full charge to an aux battery) there are still benefits in using a using one of the REDARC BCDC* chargers. It is suitable for all common automotive/recreational/deep cycle batteries, lead types (flooded, AGM, Gell, Calcium Lead Crystal) and Lithium (LiFePO4).
How a REDARC dual input BCDC dc to dc charger can charge a secondary battery in any vehicleĪ REDARC BCDC*D can be used in either 12V or 24V vehicle systems, to charge 12V auxiliary (aux) batteries to 100% SOC from all common vehicle alternator systems and from solar panels.* They are available in the 25 amp BCDC1225D, 40 amp BCDC1240D and 50 amp BCDC1250D sizes.
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