Redarc BCDC 1220 - Dual Battery charging issues

Submitted: Thursday, Jun 23, 2016 at 04:28
ThreadID: 132836 Views:18016 Replies:4 FollowUps:6
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Hi All,

Looking for some help regarding my Redarc BCDC 1220 charging unit.

What's happening is when starting the car the unit initially goes into boost mode for a short period where both the batteries are receiving voltages of about 14.7V - 15.4V.

A short time later both batteries will then enter absorption mode where the voltages go to about 13.6V - 13.8V.

This is where the problem starts. The starting battery will remain at 13.7V and does not cause an issue at any time.

However after a while of driving the 2nd battery slowly continues to lose voltage. I can be driving for hours on end and the voltage can drop down to 12.1V. If i leave the fridge on overnight at camp, often the 2nd battery is about 11.8V in the morning and problem snow balls from there, leaving me with a flat aux battery and warm fridge after 2 or 3 days.

The 2nd battery receives a small amount of charge in the boost and absorption modes when the car is started, however does not remain charging, even when the voltage drops below 12V.

From what I can gather, the wiring and fuses are all correct, I guess this can also be confirmed by the fact that the 2nd battery is receiving charge in the initial stages of charging.

Has anybody else had issues like this? Or maybe be aware of what might be causing this to occur.

Both batteries are the calcium type, starting being a sealed battery and aux a 105Ah. I have a 60L engel (fridge only), along with a couple of LED lights, only used at camp for a short time.

Any help would be appreciated.

Thanks,

Nathan.
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