This applies to REDARC BCDC chargers, including Classic Under Bonnet (25A, 40A, 50A), Core In-Cabin (25A, 40A), and Trailer models (12A, with or without solar). If all seven LEDs flash four times repeatedly, it signals a high-voltage fault on the auxiliary battery.
The BCDC will stop charging until the battery voltage returns to normal. Common causes include reverse polarity on solar inputs or multiple charging sources (parallel charging) creating excessive voltage.
To resolve the issue, check solar polarity with a multimeter, isolate and test any secondary chargers, and replace any faulty units.
REDARC recommends seeking the support of a qualified auto electrician or technician.
Important
In this article we explain the need for testing to determine the cause of the issue. Testing may involve changes to the installation or wiring. For your safety and accuracy, REDARC recommends engaging a REDNetwork member or a suitably qualified auto electrician - Find Your Local Installer
This information is applicable to the following BCDC chargers:
- BCDC Classic Under Bonnet 25A DC Battery Charger (BCDC1225D)
- BCDC Classic Under Bonnet 40A DC Battery Charger (BCDC1240D)
- BCDC Classic Under Bonnet 50A DC Battery Charger (BCDC1250D)
- BCDC Core In-Cabin 25A DC Battery Charger (BCDCN1225)
- BCDC Core In-Cabin 25A DC Battery Charger (BCDCN1240)
- BCDC Trailer Battery Charger (BCDC11212T)
- BCDC Trailer S – 12A Vehicle to Trailer Charger with Solar (BCDC1212S)
What does this look like?
The BCDC will exhibit a sequence where all seven LEDs located on the display panel flash simultaneously six times, followed by a 3.5 second pause before the cycle repeats.
What does all LEDs flashing six times mean?
This fault indicates that the BCDC has detected an input over voltage from either the vehicle or solar input.
Will the BCDC still charge my battery in this condition?
The BCDC will not charge your battery when the input supply voltage is over the normal operating voltage. The BCDC will resume charging once the input voltage is within the normal operating range.
What is the BCDC input voltage range?
The BCDC Classic, Core and Trailer S have an input voltage range of 9-32V.
What causes this fault mode?
HIGH VOLTAGE SOLAR
There are two main types of solar panel, 12V nominal (open circuit voltages below 36V) and 24V nominal (open circuit voltage higher than 36V). Solar panels that are used in commercial applications and installed on buildings (for example, house panels) generally have higher voltages that can exceed 40V.
Note: Solar panels with an open circuit voltage specification higher than 32V are not compatible with the BCDC Classic, Core and Trailer S chargers.
EXCESSIVE ALTERNATOR OUTPUT
12V and 24V operating systems are two common applications in most modern vehicles. 12V alternators have a charging voltage range of 12-15V, whereas 24V alternators have a charging voltage range of 24-29V. If the alternator regulator produced excessive voltage, it can result in exposing the system to over voltage.
How to determine the cause of the fault?
Below is a list of the common causes and repairs.
EXCESSIVE SOLAR INPUT VOLTAGE
- Review the specifications of the solar panel.
- Refer to the Open Circuit Voltage specification (VOC).
- If solar panel has an Open Circuit Voltage higher than 32V, disconnect solar panel immediately.
- With the solar panel disconnected, recheck operation of the BCDC.
What happens if I connect an unput of higher than 32V?
Exposing the BCDC to voltages outside the specifications of the unit (greater than 32V) it can result in accelerated product life and, worst-case scenario where the input voltage is well outside the voltage range (38-40V+), it could result in irreparable internal damage to the BCDC.
