Hi all,It is generally thought that acceptance rate for a flooded deep cycle battery is about 12.5 amps per 100 amp-hours of capacity once the bank is at 85% state of charge.I know that acceptance rate for AGM's doesn't taper by 85%.Does anyone know at what percentage state of charge that AGM's would taper to 12.5 amps?Thanks in advance.

Is something like that going to be generic one size fits every agm, or is it brand specific? For example the super expensive medical grade (and telco grade) agm are supposedly built different than the cheap automotive grade agm, wouldn't their charging characteristics be different too?

Gordon,Yes, but I'm looking for a "rule of thumb" so to speak.I've not had occasion to take the telecom jars to a deep cycle condition. I do know they appear to charge much faster than the marine batteries that I had before. I do have the charging rates optimized to the maker's specifications.

Deep Cycle AGM:- AGM batteries should be charged using a charger with a mode switch for AGM type batteries. It is recommended to use a charger, current limited to 20% or 0.2C of the batteries capacity at a charging voltage of between 14.6 – 14.8V following deep cycle use, or 13.6V – 13.8V for standby use.

Shadow Catcher,Nice information but it doesn't help me with the tapering point, nor the state of charge it begins to happen.I have already optimized the bulk, absorb, and float voltages specific to the particular make and model of AGM jars.

PTLet's say you charge a 100ah AGM and flooded both @ 12.5AWhich one hits its set pt first and begins to taper first?

acceptance charging rate AGM batteries | Good Sam Community

74 Replies

pianotuna
Nomad III
Aug 21, 2016
Shadow Catcher,

Nice information but it doesn't help me with the tapering point, nor the state of charge it begins to happen.

I have already optimized the bulk, absorb, and float voltages specific to the particular make and model of AGM jars.
Shadow_Catcher
Explorer
Aug 21, 2016
Deep Cycle AGM:- AGM batteries should be charged using a charger with a mode switch for AGM type batteries. It is recommended to use a charger, current limited to 20% or 0.2C of the batteries capacity at a charging voltage of between 14.6 – 14.8V following deep cycle use, or 13.6V – 13.8V for standby use.
pianotuna
Nomad III
Aug 21, 2016
Gordon,

Yes, but I'm looking for a "rule of thumb" so to speak.

I've not had occasion to take the telecom jars to a deep cycle condition. I do know they appear to charge much faster than the marine batteries that I had before. I do have the charging rates optimized to the maker's specifications.
GordonThree
Explorer
Aug 21, 2016
Is something like that going to be generic one size fits every agm, or is it brand specific?

For example the super expensive medical grade (and telco grade) agm are supposedly built different than the cheap automotive grade agm, wouldn't their charging characteristics be different too?

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acceptance charging rate AGM batteries

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