For future reference, here are the settings I ended up with on my 3000W Magnum Inverter/Charger (125A charger). I used the set-points of 14.1v for ABSORB charge, and 13.2V for FLOAT charge.
First, the following is my 'lessons learned' from this thread - lessons from some great contributors. Please correct anything I got wrong, or of course fill-in any gaps where I missed something.
The video in the OP suggested battery type of CC/CV. This results in the charger going dormant while the batteries decline from 14.1v down to 13.2v. At 13.2v, the charger is awakened and tops-off the battery back to 14.1V when it shuts-down ("SILENT" in Magnum-speak).
This means that in CC/CV mode, the batteries are almost always carrying the house loads, not the charger.
As "Guy with a Boat" said, better than holding the batteries at constant 14.1v, but less than ideal because the batteries power the house loads. "TwistedTree" suggested finding a setting where the Charger carries the house loads, not the batteries. I believe I have done just that and wanted to capture the settings for future reference.
I changed to the <CUSTOM> battery type with the same 14.1v ABSORB/13.2v FLOAT set points. In CUSTOM, the ABSORB time needs to be set. I have six 100Ah Lion Energy batteries - I used 15-mins each so 1.5-hours in ABSORB. When the time expires, the Charger shuts-down and the batteries descend to 13.6v, their at-rest 100% charged state. House-loads cause the bank to further decline to 13.2v whereupon the Charger enters FLOAT and carries the house loads indefinitely.
This means that in CUSTOM mode, the charger almost always carries the house loads, not the batteries.
For future search reference, here are the Magnum Charger settings I used for my 600Ah bank of Lion Energy LiFePO4 batteries:
Under the SETUP menu screen:
03 Absorb Time:
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04 Battery Type:
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09 Final Charge (this is the mode Charger goes to after ABSORB is complete). This is the biggest difference between "CUSTOM" and "CC/CV" because it means the Charger will carry the house loads once it hits FLOAT:
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Note in "FINAL CHARGE" selection. There is also a "MULTI" option instead of "FLOAT". Multi is supposedly for when there are other charging sources such as solar, which I have. I will tinker with going to MULTI to see what happens, but for purposes of this post, I'm going with FLOAT as the final stage.
TWO CLOSING THOUGHTS
- 13.2v/70% FLOAT setting: While FLOAT at 13.2v means the batteries will almost always be at 70% charge which is good for the batteries, it does mean you will depart on a trip with batteries that are not topped-off to 100%. This should not be a problem if your alternator has decent output and is configured properly as it will immediately go to BULK and top-off the batteries within a couple hours. You could also increase the FLOAT setpoint to a higher value so the batteries are charged more fully (13.3v would give approx 85%).
- What about Magnum's LFP battery type setting instead of CUSTOM? My charger pre-dates the inclusion of a LFP battery type so I cannot speak directly, but my guess is the LFP settings are pretty generic and probably not as well thought out as the above 14.1v/13.2v ABSORB/FLOAT set points. I'd be interested in anyone's direct experience with a newer Magnum with LFP settings.
Hope this helps someone down the line. Has been a good learning experience for me. Thanks again to all who contributed.
Peter