This thread covers lots of ground. Including coverage of Don's added BMK Meter and some of the Magnum settings available via the usage of the BMK Meter.
I too have the combo of the MS2812, ME-ARC Remote, BMK-Meter, Smart Battery Combiner, Temp Sensor and AGS modules. And I also have solar, fed down thru a MidNight Classic 150 Controller, with WhzBngJr module added to the BMK-Meter to feed the Classic 150 SOC and AH info.
Working with both Lifeline and Magnum, I found last year that I had inadvertently 'walked my battery bank down', and this resulted in sulfate build up and an early demise of the bank. I had about 5 1/2 year old bank of X's 4 L16's Lifelines, for 800AH's. This was sized at about double my then battery bank needs, so that I could live on the top 25% of the SOC, and reduce the non infinite number of DOD cycles. It was because my bank was oversized some for our actual average nightly needs while boon docking, that I did not realize I had a problem earlier, and had been gradually losing overall bank capacity 'Walking Down' the bank via constant under charging.
While in storage next door, with a 20A feed to the Magnum. And also while traveling from Shore Power to Shore Power, I had turned our MidNight Classic 150 controller Off, and let the Magnum manage the maintenance of the battery bank. I left the Magnum Final Charge set to Multi.
What I did not know, is something that 757Driver helped me with, and later tech support from Magnum confirmed - that when set to Multi the Magnum does waits until the Voltage drops to 12.6V, then goes into Float mode, and runs for only 4hr, and shuts down. Well for AGM's, 12.6V is too low to start back up charging (And, it is not a custom set parameter, so it is what it is.). And for a larger bank, like the 800AH's I have, and the slightly larger bank of AH's that Don has - well, 4hr's of Float is not going to get the bank back up to 100% SOC. And thus, the gradual 'walk down' of the bank. (Please note that I put in the 4 hr value of float, vs Don's below post to me said 1hr. I asked this of the Magnum Tech twice, and the second time she put me on hold to go check with another Magnum Associate, and came back to confirm it goes into Float Mode for 4 hours.)
I'm fortunate as the Lifeline Bank can handle as much AH's as the combination of our 1250W of Solar Panel, via the Classic 150 - and the Magnum Charger in Bulk - can toss at it. A smaller bank, and or if another brand of AGM's have 'Max AH's' that are not as robust - could require more finite settings between various charge sources.
So I'm now leaving the Solar feed on at all times, even when on Shore Power. I'm still set to Multi for the Magnum's Final Charge. And, I have added a once every 4-6 weeks timeframe 3 1/2 hours run of the Magnum's Equalization (Conditioning for Lifelines) - but set down to the 14.4V Bulk Level (Vs 15.4V Lifeline Conditioning Value). I do this 4-6 week 3 1/2 hour 14.4V bulk exercise - to help keep the Lifelines from Sulfation build up. I reviewed this plan with the Lifeline Tech that had helped me when I was trying to understand what had happened to my first bank of Lifeline's. And he felt that was a good strategy to keep the battery bank in good shape, but also not 'over cook' the battery/mats.
I'll wrap up by also sharing CMartin's desire for Magnum to modify some of their logic to allow SOC, vs Voltage, to be the deciding factor/trigger of some events. (AGS Auto Start, LBCO, when to trigger charge back on again, etc.).
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I share all of the above, and below the post to me from 757Driver (Don) - as it may help some of you on your Magnum settings too. As does thread's like this that former Diplomat Don started also continues to help me. So many variables come into play on the care and feeding of our batteries
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Best to all, be safe, have fun,
Smitty
----- Start if 757Driver's input (Note the 1hr should be 4hr, for Float)-----
Smitty,
Do you have solar panels and are they active?
What is your final charge set to? If final charge is set to Multi then your charger will go into sleep mode, show full charge on the display and not turn back on until the voltage drops to 12.6v or less. Once the charger comes back on it will only come on in Float mode at a trickle charge and only for 1 hour. With most AGM batteries the 1 hour is not long enough to bring your battery bank back up to full charge because of the higher voltage AGM batteries sit at. If you do not have a significant solar array I would switch final charge to float.
-------- End of 757Driver's input -----