Tel 12-170FGa AGM batteries

[nycamper62]

Got a screamin deal on 4 of these AGM's. I have them in series for a 12 volt bank. The bat box is vented from inside the camper/rv, as I used to run 6v GC2's. Well I have two questions about these batteries I'd like some help & opinions with as these are my first AGM's on the system.
First, I have a new Renogy mppt 40 amp controller and I'm thinking I may need to adjust the settings as I've read stock mppt controllers are aggressive on certain AGM's. Now while the controller has a temp probe hooked up it can get cold at camp, and I'm not there all the while with the heat on through winter.

 

[mikefitz]

4 of these AGM's. I have them in series for a 12 volt bank

They seem to be 12v batteries, and the picture shows a series connection, this does not agree with 'for a 12 volt bank'.

Data from,

C&D Technologies TEL Series/C&D TRUE Front Access® TEL 12-170 F/ FG - Sure Power, Inc

We have UPS batteries in stock and ready for immediate shipping. Find the best prices for C&D Technologies TEL Series/C&D TRUE Front Access® TEL 12-170 F/ FG

www.sure-power.com

Use the default 'sealed' setting in the Renogy controller.

The ideal charge current for a single battery would be around 35 amps.

 

[SamDeleted]

I have them in series for a 12 volt bank.

Looks like 4x12v batteries in series to make 48v

Try with the circuit tester

 

[nycamper62]

The first pic was taken at the shop where I got them for information on the front sticker.
Here is a pic of my bank. They are in parallel.
Thank you for the data link.

 

[SamDeleted]

The first pic was taken at the shop where I got them for information on the front sticker.
Here is a pic of my bank. They are in parallel.
Thank you for the data link.

Awesome batteries, should give you years of loyal service

2kwh capacity per battery, 10.5v low volt cut off


Stay within manufacturer rated float/bulk charge voltages.

listen for bubbling under bulk charge, if it bubbles bad turn the voltage down until bubbling subsides .... Bubbling means they're losing electrolytes (gasing out the vents), fine on flooded lead acid, no good for sealed as you can't replace it, once it's gone it's gone

 

[pollenface]

Look like pretty awesome batteries!

No mention of temp compensation coefficient, i go with a -4mv/°c/cell for AGMs unless it's stated otherwise.

 

[SamDeleted]

Look up a datasheet for absorb/float voltages. May have to contact the distributor or manufacturer.

Float is there , no bulk number , it'll be somewhere between 14.5v & 15v

14.5v will work ok for most any AGM

 

[pollenface]

Float is there , no bulk number , it'll be somewhere between 14.5v & 15v

14.5v will work ok for most any AGM

Yeah i just found the datasheet on the link above.

14.4-14.8v @ 25°c

 

[mikefitz]

The data for charge, 'boost' voltage was accessed from the link I posted.

Charge voltage is one aspect of charging AGM, charge current is another. Where the batteries are cycled unless you can regularly charge at 0.2C there is a risk of reduced service life.

 

[SamDeleted]

The data for charge, 'boost' voltage was accessed from the link I posted.

Charge voltage is one aspect of charging AGM, charge current is another. Where the batteries are cycled unless you can regularly charge at 0.2C there is a risk of reduced service life.

Now isnt that a minimum of 0.2c ?

 

[SamDeleted]

Now isnt that a minimum of 0.2c ?

"Recommend Maximum charge current c20/5a (37.2amps)" per battery

4 batteries wired for 12v, max recommend would be 148.8amp total ,

Or about 2kw of charging max @ 13.5v

 

[Brett V]

My first system was 8 of those in a 2x4 24 volt arrangement. They are designed for standby use, not deep discharge cycles. You can cycle them, but don’t undercharge between cycles, they will sulfate. Mine were 180 ah but I think they’re the same battery with different specifications.