[RE-wrenches] How Best to Load Test 2 V Cells

[Dave Angelini Offgrid Solar]

I can ask my battery guy! He is the best with AGM and a dealer for full
river and concord. He does this alot! Saves a bunch. He always says that
most of the warranty is just a full/corrective charge and 80% are good.
Undercharging is the problem. Very very few are overcharged. His words! I
just replace the bank, no time to play with this stuff. 

However, I just
do the same thing I do with any bank of individual batteries. I put a large
load on the bank with the inverter and look at each cells voltage. You may
have done this...  

The hard part is, depending on the make, is pulling
the cell and doing a full charge and EQ if it is the make that allows it.


The other hard part is just getting batteries these days. I just heard
Trojan is 8+ months out. You know what Steve from RollsSurrette has said. 8
weeks I think. 

The easy part, what make is your cell?   

Dave Angelini
Offgrid Solar
"we go where powerlines
don't"
http://members.sti.net/offgridsolar/ [1]
e-mail offgridsolar at sti.net
[2]
text 209 813 0060

On Wed, 14 Jul 2021 10:16:31 -0700, Jeff Clearwater 
wrote:  Hey Good Folks,

 I've got a 2300 AH AGM pack of 2 Volt cells that
is showing signs of premature aging (only 600 cycles) and I need to test
the AH capacity of each cell to help the customer make decisions going
forward of whether to replace individual lagging cells or the whole pack.


What equipment have folks used to do AHour tests on 2 Volt 2300 AH cells?
I've done plenty of load testing on 6, 12, 24 and 48 volt packs as a whole
but am not sure what's my best approach is for 2 volt individual tests.

 I
know I could put a resistance load and then use an AHour integrator unit -
but does anyone know of what unit and what resistive load I'd use at 2
volts? That would be a large device at that voltage to get any appreciative
wattage! - I'd like to do a 10 hour test at most.

 I see 2 V test units on
the web but they only appear to be hooked up for a small amount of time -
so they can't be testing full to empty discharge AHours. 

 Thanks!

 Jeff
Clearwater
 Village Power Design
 www.villagepowerdesign.com
[3]

Links:
------
[1] http://members.sti.net/offgridsolar/
[2]
mailto:offgridsolar at sti.net
[3] http://www.villagepowerdesign.com
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