Auxiliary Battery Discontinued

[AS00361]

Given that the option to have a factory fit auxiliary battery has now been discontinued, what would be required in order to fit one to ensure smooth running of a front mounted winch, such as NOMAD winch or similar? Does the vehicle come with the CTEK battery management system when not fitted with the auxiliary battery?

 

[Bobcat Sig]

I'm also interested in this as the '25 demo truck I was set to buy was sold. It was fitted with the OEM second battery kit and I'm keen to add that to whichever truck I acquire.

 

[anand]

The factory single battery is more than sufficient for winching operations. The aux battery doesn't really help with winching in the OEM configuration as it can only trickle charge the primary battery or connect for 10 seconds if primary battery voltage drops into the ~9v range

 

[AS00361]

The factory single battery is more than sufficient for winching operations. The aux battery doesn't really help with winching in the OEM configuration as it can only trickle charge the primary battery or connect for 10 seconds if primary battery voltage drops into the ~9v range

Thank you, is this still the case on a larger/ longer line winches that might be used for extended period of time? I was thinking that even just running two of the same battery in parallel might help with this?

 

[TCMColorado]

Thank you, is this still the case on a larger/ longer line winches that might be used for extended period of time? I was thinking that even just running two of the same battery in parallel might help with this?

The alternator supplies most of the power for the winch. The batteries, even in a dual setup, will be quickly depleted without the support of the alternator.

 

[anand]

Thank you, is this still the case on a larger/ longer line winches that might be used for extended period of time? I was thinking that even just running two of the same battery in parallel might help with this?

Two of the same battery in parallel would certainly allow for longer winching times.

But the vast majority of off road vehicles in the world that use winches are using them with a single 12v battery that is smaller than the 105Ah battery of the Grenadier and doing just fine. Warn recommends ~650CCA battery as a baseline for their winches, from memory I believe the Grenadier battery is ~900CCA.

If you are doing a single continuous 80ft line pull on a loaded 12,000lb winch (~450A), then yes, bluntly you're going to run out of battery whether you have a single or dual battery. Winching in 80ft of line at full load is nearly 20 minutes (taking Warn's "average" winch speed of around 4ft/minute)

As @TCMColorado stated, the alternator is the big player here, and at idle can supply something on the north side of 150A; given a slow wheel speed while winching you should be at right around 1,000-1,100RPM which will help even more in supplying the needed amperage into the system

 

[AS00361]

Two of the same battery in parallel would certainly allow for longer winching times.

But the vast majority of off road vehicles in the world that use winches are using them with a single 12v battery that is smaller than the 105Ah battery of the Grenadier and doing just fine. Warn recommends ~650CCA battery as a baseline for their winches, from memory I believe the Grenadier battery is ~900CCA.

If you are doing a single continuous 80ft line pull on a loaded 12,000lb winch (~450A), then yes, bluntly you're going to run out of battery whether you have a single or dual battery. Winching in 80ft of line at full load is nearly 20 minutes (taking Warn's "average" winch speed of around 4ft/minute)

As @TCMColorado stated, the alternator is the big player here, and at idle can supply something on the north side of 150A; given a slow wheel speed while winching you should be at right around 1,000-1,100RPM which will help even more in supplying the needed amperage into the system

Thanks for taking the time to reply, that is interesting that in the current auxiliary setup the second battery does not really support winching operations. Is it purely for secondary electronics like fridge etc?

 

[TheDocAUS]

Thanks for taking the time to reply, that is interesting that in the current auxiliary setup the second battery does not really support winching operations. Is it purely for secondary electronics like fridge etc?

It also helps the car start if the main battery is low. Plus it trickle feeds the main battery (I think the proper term is equalise rather than trickle feed). The main battery is not isolated from the aux battery in the OEM setup.

 

[anand]

Thanks for taking the time to reply, that is interesting that in the current auxiliary setup the second battery does not really support winching operations. Is it purely for secondary electronics like fridge etc?

as @TheDocAUS said, it trickle charges the main battery, no loads are connected to the aux battery