Lifeline Battery Recovery experiences?

Ductape wrote:
800 AH you need 160 amp charge current to meet the 20% of capacity recommendation from Lifeline for deep discharge bulk charging. I had a similar setup on our prior coach, and noted some symptoms of early voltage drop under load after a lot of shallow discharges and slow solar recharging.

I had a marine battery selector that allowed me to divide the big bank in half. I found that by halving the bank, drawing the smaller bank down to around 50% and then vigorously recharging with my converter (at 27% of C) they got stronger each cycle. Voltage drop took longer under load and charge acceptance increased.

I also periodically top charge them and use a precision ammeter to ensure I get them to the 1/2% spec.

Thanks! This is an area where I'll gladly do more homework:)!

When I talked with Lifeline about the Magnum AGM1 Lifeline setting, they said it would factor the battery bank size as long as I entered it properly. I remember the tech at least three times explaining to me that I had an 800AH bank, not 1200AH. (Well, I knew this. Think I confused him, or he misunderstood me when I said we had the 1200W of Solar.). And yes, the Magnum is set to 800AH bank. (I don't recall what the efficiency is set to now, as I adjusted this a tad when the batteries turned age 3, to compensate for aging. Will check that...)

But upon reading your post, I reflected back and noted that when first turning on Shore Power feed, with say a SOC level in the mid 70's level, the Magnum Charger would engage, and jump to the 115-125A level. I think the higher I recall seeing, was 131A.

But as the Bulk charge took place, this would taper down to 75-85A relatively soon. Say within 30-45 mins. I assumed this was due to the reading of the batteries, and temperature sensor adjustments?

The times when I would leave the MidNite Classic150 Controller on along with the Magnum MS2812 Charger. I would see it adding 40-50A Bulk, on top of the Magnum's 115-125A when it first started. So a combined 155-175A going into bank, if my thinking is correct(?).

I like how you've A/B'd your bank so you could get more dedicated Amps into a half bank during a charge cycle.

Seems my homework is to under C/20 value of 160A, and review with Magnum how/why the max I see is in the 115-125A range?

Would not be surprised if I have here a situation where I 'Burned as I learned!' - in this case, if I've shot these batteries to heck, and expensive one:)!

And note MW, I'm still doing more studying of your post. Know I can't do any weighting of the batteries as we're traveling. That will need to wait until April when we're back at home.

Will also consider the A/B isolations switch of the Bank into 400AH half, especially if the talk with Magnum reveals the info I received that the AGM1 would adjust to support the entered size of the bank (That information was from the Lifeline Tech.).

Beautiful sunset shaping up at Lost Dutchman State Park... So time for an adult beverage, or two...

Best to all, and thanks again,
Smitty