22 | Frequently Asked Questions
I’ve heard that you shouldn’t charge 2 batteries of different chemistries from the same
source, will I have any problems charging my AGM or Gel auxiliary battery from my Lead
Acid start battery?
The BCDC Dual Input does not ‘link’ the batteries together like a battery isolator does, it is a DC-DC
battery charger. The output from the unit is tailored specifically to the selected output battery type,
and therefore allows the optimal charging of the auxiliary battery, no matter what chemistry your
start battery is.
My BCDC Dual Input is setup for 12V Alternator input but will not start when the vehicle
is turned On, I’ve followed the trouble shooting guide and the setup is fine, what’s the
problem?
The most likely cause of this issue is that the BCDC Dual Input is somehow stuck in 24V mode.
Try removing the Vehicle wire (RED) and reconnecting it. If the problem persists, contact REDARC.
Alternatively, the input voltage may be too low, check that the input voltage is above the input
thresholds outlined in "1.6 Turn On/Off Thresholds" on page 10.
Can the BCDC Dual Input charge from Solar and Vehicle power at the same time?
Yes. The BCDC Dual Input will always attempt to supply power from the Solar source first (when
available) and will supplement this input with power from the Vehicle source (when available).
Can the BCDC Dual Input operate with only a single power source input?
Yes. The BCDC Dual Input will operate as a stand-alone solar regulator when only Solar (YELLOW
wire) is connected or it will operate as a DC charger when only the Vehicle (RED wire) is connected.
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