Redarc BMS1215 failing to do its job (Help!)

Submitted: Monday, Mar 07, 2016 at 10:27
ThreadID: 131770 Views:8955 Replies:6 FollowUps:13
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A technical question that is very specific to the Redarc BMS1215 battery management system.

I use this system in the vehicle, have a 150AMP Gel Battery connected (Auxilliary) and it has two Redarc 120W solar panels connected.

The BMS1215 unit, which has worked well over a period of time, is now allowing a current draw from the cranking battery sufficient to drain it very quickly when the vehicle is switched off. Clearly the system is designed to prevent this from happening and my auto-electrician and myself have been in discussion with Redarc Technicians on the issue.

In fact, they sent a replacement unit and this is also allowing the same to occur.

All wiring has been checked (and rechecked) and was professionally installed and we have a high level of confidence the problem does not exist in the wiring or earth. But regardless, the unit is designed to not allow any current draw from the cranking battery if the vehicle is switched off.

When the 2x120W Redarc solar panels are disconnected, the current draw from the cranking battery stops. So it points to a possible issue in one or both of the solar panels that is affecting the electronic circuit in the BMS1215 unit.

Now, I could install a mechanical smart solenoid to resolve the immediate problem – but the question remains as to why it is happening.

Any thoughts or suggestions, adding that I continue to work with the Redarc people on the problem, they are helpful and concerned to get a resolution, but everyone is scratching their heads!

Cheers, Baz – The Landy
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