Charged/Float Voltage for AGM's ? (48V)...

I have a MPP Solar inverter (will did a review on this) its the 48V Hybrid system 5KW....

Just finished hooking up system and inverter is charging batts... I have 8 BANKS batts (all 12V AGM Gel batts)...

What should I set the inverter at for its MAX Charge ? I see on the BATT Meter it is at 56.9 Volts right now... I'm sure the one batt meter isnt exactly correct as it only says I have like 157AH but that isnt correct... as Each bank is 120ah (X 8 banks... should be 960AH)....

Also I was thinking MAX Charged voltage/float should be 13.8 per batt X 4.. which is.....55.2 volts.... correct ?
Attached is pics of the batt meters/ system.

Thanks in advance for any input...

If you check the label on the battery it will probably say something like
Standby Use: 13.x to 13.x
Cyclic Use: 14.x to 14.x

The 14.x x 4 (number of batteries in series) is the absorption level voltage to charge at after bulk charge is complete. Anywhere in that 14.x-14.x x 4 range is OK for absorption.

Once that stage of charging is complete the float voltage is based on the standby use voltage of 13.x to 13.x. The max float will usually be 13.8, 13.8 x 4 is 55.2, so that's OK too.

I had totally forgot to post the URL of the Batts.....
here is also what I got off the label of the batt's

URL Of batts: https://www.osibatteries.com/p-915-...oQLU7QOvjbX9FFNW-Wgmnm8bBZsgvvRoCAAcQAvD_BwE#

OK, so your float is 13.5 to 13.7. 13.7 x 4 = 54.8 so that is your float voltage maximum. According to the manual for the battery the 2nd stage charge voltage, that they also refer to as equalisation charge which is interesting, is 14.4v max. For the absorption stage the voltage becomes 57.6v

Lead acid batteries tend to drift away from each other in voltage fairly quickly. That has implications when charging them in series as you are. If they aren't kept in step during charging one or more batteries will get a higher voltage across their terminals than another. That could potentially exceed the 14.4v maximum as per the manual. IMO you should have a balancer across the batteries in each bank. You don't need a fancy balancer for this. A 'HA02' balancer off ebay would be good enough but see what other people have to say about it here first.

Thanks on the suggestion on a balancer.... I havent heard of this (im new..)
Do you have a suggestion as to a blancer or a link ?
Just looked at the BATT voltage... it went to 54.5 volts... so that is maybe a good thing as it isnt overcharging I guess....
And I look at the inverter display... and it says still charging...... At least it went down from that 56.9 (I dont wanna overcharge it and have a chernobyl meltdown happen lol)...

Ive gone w/ the defaults in the inverter... which it IS set to AGM

Check the manual it will tell you the voltages that the AGM preset uses. Normally that'd be fine but your batteries have lower than normal charging voltages so you should look into configuring the voltages manually.

HA02 4 12v battery balancer

Thanks for all the info and a link to ! Looking at the balancer it looks like I need 1 Balancer per 4 batteries ??(because I have 8 banks of 4 batts to equal my 48v.... (if so that will cost me a mint ...)

Other people might have an option for you so don't worry yet but IMO you really do need a balancer with lead acids in series.

There are different arrangements of batteries that could be done too. Instead of 8 parallel sets of (4 x (single batteries) in series) you could do 4 parallel sets of (4 x (2 parallel batteries) in series), etc. There's trade offs in the various ways.

I'm sure someone else will pop up and explain it more clearly than I am

thanks, I so much appreciate the info.....
You think I need 1 balancer pre bank of 4 batts ? so 8 balancers total ??

I converted the ebay AUSTRALIAN Dollar to USD and the $452 AUD came out to 300 USD... that is for 7 Balancers ....

If you keep your current configuration, yes, 8 since you have 8 strings. Don't buy yet, see if someone else comes up with a solution.

I fully understand !! and I much appreciate the help !