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Old 12-07-2014, 01:02 PM   #1
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AGM vs flooded charge time

I'm considering switching from flooded to AGM batteries and was curious how much faster AGM charge vs flooded batteries?
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Old 12-07-2014, 01:04 PM   #2
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I switched from flooded to AGMs and I can't tell you with data. I can only say that I don't notice any differences in charge times. It is important to verify that your charging system has a AGM compatible charging program. Mine had two diff ones to choose from, and I don't recall the details but I had to call the battery manufacturer to see which one they recommended.
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Old 12-07-2014, 01:24 PM   #3
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Yes I have the Magnum charger it has setting 4 AGM battery charge. well that's disappointing that you don't notice any difference because from what I've researched AGM is supposed to charge faster
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Old 12-07-2014, 03:37 PM   #4
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Not sure about the speed of charging. I don't boondock and so I'm probably not a good source of info for you.
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Old 12-07-2014, 06:22 PM   #5
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An important point not always mentioed by AGM sellers is AGM batteries can "be" charged faster. That means you can and do need a higher output charger to do that. If you are using the same charger that you used for your wet cells, your gain will be small.
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Old 12-07-2014, 07:05 PM   #6
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My magnum charger bulk charges at 100 amps I would have a total of four six volt batteries for total of 440 amp hours
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Old 12-07-2014, 07:18 PM   #7
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Quote:
Originally Posted by buckeyemike View Post
I'm considering switching from flooded to AGM batteries and was curious how much faster AGM charge vs flooded batteries?
An AGM battery is still a lead acid battery but one that is operating in a starved electrolyte mode. This is to say that there isn't enough electrolyte for you to be able to overcharge the battery. With the glass matting AGM batteries are also spill proof.

I don't want to get into charge time discussion but in my mind lead acid AGM = lead acid flooded cell. The only difference is one can be spilled and one can't.

With my 3-stage PD 9260 I water my batteries twice a year a task I don't find especially onerous. I have 4X6V and 2X12V.
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Old 12-07-2014, 07:39 PM   #8
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Did anybody mention AGM weren`t lead acid?

Wet or flooded are used to discribe batteries with caps to check water.

AGM batteries can be overcharged and damaged. That is why you don`t equalize them.
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Old 12-07-2014, 07:50 PM   #9
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Quote:
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Did anybody mention AGM weren`t lead acid?

Wet or flooded are used to discribe batteries with caps to check water.

AGM batteries can be overcharged and damaged. That is why you don`t equalize them.
That is not what Lifeline says...check out this document:
Lifeline Batteries - Marine & RV Deep Cycle Batteries

"Conditioning/Equalizing Charge: 15.5 volts for 8 hours
Conditioning/equalizing should only be done when the battery is showing symptoms of capacity loss. If conditioning/equalizing is necessary, first go through the normal charge cycle. Once the battery is as fully charged as possible, start the conditioning/equalizing charge"
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Old 12-07-2014, 07:50 PM   #10
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AGMs CAN be charged with higher current than wet cells. Of course, the charger needs to be able to give them the extra current. If you have an ME inverter/charger (I have the MS 2812) you should see an AGM 1 (Lifeline Batteries) and and AGM 2 (all other AGMs) program which will take full control.

I just replaced my 4 Lifeline GP-4CT batteries with new ones. In the process I added a battery monitor kit (ME-BMK), ME-AGS and ME-ARC. I am very impressed with the charging performance of the system.

Let me toss out something else to consider. The time to charge any battery is directly related to how far you let them get depleted. Also, whether you are charging with solar power or a generator can influence the perception of how quickly a battery recharges.

For the most part you probably don't really care how quickly they charge if you are on shore power. If you are relying on solar or generator power you will care a bit more. Even then there are differences between Solar and generator power in how to better manage them.

As an example, if you have a good solar system and weather cooperates, you will charge your batteries up to 100% state of charge (SOC). With a generator only you will probably only charge to about 90% because the fuel it takes to get from 90% to 100% is not well spent.

These are all affected by how low you let your batteries get depleted. As a rule of thumb you seriously avoid discharging below 50% SOC. So, as an example, I have a total of 440 AHs at 12V. I need to recognize I really only have about 220 AHs that are useable without recharging. Yes, you can go further but how deep and how often you go below 50% SOC will determine how quickly you cause your batteries to deteriorate.

So...since I don't have solar and rely on a generator for my infrequent boon docking, I set my AGS to start charging at 60% SOC and shut down the generator when I reach 90% SOC. That protects my batteries and reduces the generator run time.

Finally, how many batteries and their combined size will affect your recharge time. All things being equal, It takes about twice as long to recharge 880 AH worth of batteries from 50% SOC to 100% SOC as it takes to do the same for 440 AH batteries.

Now...I realize I very generally answered a lot of questions you didn't ask. LOL These are just some things to consider before you get all hung up on recharge times.
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Old 12-07-2014, 07:53 PM   #11
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Quote:
Originally Posted by twinboat View Post
Did anybody mention AGM weren`t lead acid?

Wet or flooded are used to discribe batteries with caps to check water.

AGM batteries can be overcharged and damaged. That is why you don`t equalize them.
UM...AGMs can be equalize charged. At least Lifeline batteries can. All batteries can be overcharged and damaged. using a proper charger is what is needed to avoid that.
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Old 12-07-2014, 08:13 PM   #12
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My bank is the same size as yours then its 440 amps. so do you recall how long it takes you to get from a 60% SOC to a 90% SOC?
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Old 12-07-2014, 08:18 PM   #13
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My bank is the same size as yours 440 amp hours. so do you recall how long it takes your generator to bring you from a 60% SOC to a 90% SOC?
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Old 12-07-2014, 08:20 PM   #14
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Lifelines should be equalized only when showing reduced capacity.
Wet cells can be equalized regularly to retain capacity. Not quite the same but you are right.

Just saying
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