Do AGM's charge quicker?

[SFVdave]

Looking to cut generator time. Have solar but sometimes have little to no sun when dry camping. Read AGM's charge up to 5X faster than flooded. How can that be, converter charger only puts out so much?

[MEXICOWANDERER]

Sigh! Why can't an armored car do a flip and fling a gunnysack through my window? Actually that wouldn't work -- I'd return it and pray for a reward.

I should count my lucky stars I (at least) have a pair of Lifelines. No sense getting greedy.

[MrWizard]

battle born drop ins 100ampHr from Arizona solar are a less than that

one youtube traveler/blogger recently bought (2) for $1700

[Itinerant1]

Mex when I hit the big lotto I deliver you a battery or 2. 😉

[MEXICOWANDERER]

Now if I can clear the thirteen hundred dollars for 100 amp hours part...the hundred four seven dollars tax and sixty dollars shipping.

[MrWizard]

a drop in battery has BMS for the battery 'built in' to manage the cells

you the 'end user' does not have access to individual cell info
unless the Mfg, includes a data plug and interface for collecting such data

the few 'drop ins' i have looked at, did not have that ability

[Itinerant1]

One thing with drop in batteries is that you don't know what individual cells are doing, they'll tell you soc and some other misc info but you just don't know what the cells are doing. If they aren't prismatic cells how do individually monitor a mass group of small batteries put in series other than the end product of a 100ah battery.

[pnichols]

MEXICOWANDERER wrote:
Do lithium batteries automatically come with cell to cell management systems? And user interfaces that allow real time monitoring?

Yep. Here's one - and there are others: https://www.lithiumion-batteries.com/index.php

[MEXICOWANDERER]

Thank you itinerant. The Christmas light bulb current limitation might discourage me from doing lithium. I play with six cell series parallel tiny lithium batteries and I wonder how how thorough the monitoring and control has to be?

Ampere limitation?
Voltage limitation
Heat

And over discharge.

Without an ability to charge and monitor each cell separately the concept to me is incomplete. Maybe I am off on a wrong track.

[Itinerant1]

MEXICOWANDERER wrote:

Do lithium batteries automatically come with cell to cell management systems? And user interfaces that allow real time monitoring?

Some do some don't. As in all things homework needs to be done.

Like any battery system the more control or live time info wanted end user might have pay extra for those wants.

My system does.

[MEXICOWANDERER]

I wish you had kept that Harbor Fright wing-ding generator and changed the spark plug 😞

What I seek is a rash of "I cannot believe the difference in lifespan" appearing on this forum. Pretty selfish of me 😉

[BFL13]

Thanks Mex (I think). So I am doomed to my fate. I have to follow the rules or pay the price. It least I know what the rules are, from being on this forum. 🙂 As long as it is not too impossible, I will follow the rules.

[MEXICOWANDERER]

Take a gander at the group 31 charging specs of a FLOODED group 31 Rolls battery

http://www.rollsbattery.com/battery/31-m-130/

[MEXICOWANDERER]

It isn't go/no-go situation. Your 16.7% will work fine but take the battery to 90 percent state of charge most of the time. And to 100% at least every 10-14 days.

You do not want sulfation meaning occlusion of the plates to harden -- it's similar to what happens to flooded batteries. I threw a freakin' fit at Optima in 2005 over this. I also pleaded with Concorde. They soon saw the light. And publications changed. They damned well knew who I was -- the tame tiger who eats the guy with the whip.

Below 15% of amp hour total is no-no. But 15% to 20% can be made up with fuller recharging above 85% - 90% and like with anything chemical TIME enters the picture in all facets of chemical reactions. Cheat one thing a bit and it has to be made up by percentages and time on the other factors.

Chemistry is cruel. It doesn't care if I agree with it or not. Knowing more throws more loops of slavery and dire knowledge of consequences around me. Don't cheat on these values is my recommendations BFL13. The charge percentage and recovery minimums are at the bitter minimum of acceptable limits.

Let those who ***** and moan about having to LEARN (adjacent to kiddieporn in their mind for utter repulsiveness). I do not have the money to be be dismissive about ignorance or learning. You wish to learn BFL and I am happy to share.

[BFL13]

I would like to know something useful from the published specs, such as for my two 100AH AGMs , spec max amps about 27a each, where I now use my 55 amper on both (going over by 1a). What would happen if I used my 75 amper instead? 75/200 = 37.5%

It would be convenient if could use the 75 amper (in turn) on both the 250AH battery ( spec max 100a) and for the two 100s. Instead, I have to deploy the 55 and the 75. But you say, just use the 55 for both where 55/250 = 22%.

But then off- grid for a 50-80, I would not have the 75, just the 55, so that would take more gen time.

It would also be convenient if I could use the 75 amper without having to split the bank. 75/450 is 16.7%. The battery specs are silent on minimum charging rate. Mex is the one that says do 20% regardless of the published specs. Darn Mex anyway!

And I can't do 20% of 450AH ( 90 amps) with anything because I can't run my trusty 100 amper with my little 2200w gen or at home on shore power or it will pop the breaker. (My previous Honda 3000 did that 100 amper) This is entirely Mex's fault!

I originally thought I was home free as long as I kept the charger voltage at 14.4 until amps got down to 0.5 per 100AH. Easy peasy. Then this 20% came along and screwed it all up, so I have to split the bank and use different chargers. Drat!