[RE-wrenches] High to normal SG

Wed Jul 21 11:45:32 EDT 2021

Steve,
Do you measure voltage of each battery with them disconnected or as is.

Jeremy Rodriguez
Solar Installation / Design Expert
All Solar, Inc.
1453 M St
Penrose Colorado 81240

Sent by Jeremy's iPhone. Sorry for typos and shorthand.

On Jul 21, 2021, at 8:59 AM, Steve Higgins <steve at surrette.com> wrote:

Jeremy...

A single string of 6v L16 @ 48 volts you will want to run about 30-40 amps of discharge current...   This with losses is about 1500 to 1800 watts.

Make sure the battery is charged,

Run the loads

Measure the Batteries... my bet is since you are getting a LBCO drop out the battery in question will fall off quickly

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Steve Higgins ⋅ Technical Services Manager
t +1.902.597.4020  m +1.206.790.5840
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On Wed, Jul 21, 2021 at 7:54 AM Jeremy Rodriguez <allsolarjeremy at msn.com<mailto:allsolarjeremy at msn.com>> wrote:
Okay
Is there a quick way to run on just one string? Or should I say determine which batteries would make a good string.
I’d normally say,  find the best batteries based on specific gravity and use them,  but in this case all specific gravity‘s seem good.

Jeremy Rodriguez
Solar Installation / Design Expert
All Solar, Inc.
1453 M St
Penrose Colorado 81240

Sent by Jeremy's iPhone. Sorry for typos and shorthand.

On Jul 21, 2021, at 8:44 AM, Steve Higgins <steve at surrette.com<mailto:steve at surrette.com>> wrote:

FLA batteries cells fail generally in two manners.

Open Cell and Shorted.

Open Cells are more resistive and "Eat up" charging voltage which denies voltage and charging potential to the rest of the bank so the entire bank sags.   This is the most common type of failure.

Shorted Cells are less resistive so they allow voltage and current to pass on to the rest of the cells in the string.   This causes an overcharge condition because the dead cell isn't dropping any voltage and the rest of the cells in the string become "overcharged".

Sometimes SG's will look good, but when the bank is under load you will see the voltage drop off quickly.   This is often the shorted cell.

Battery SG's are like Goldilocks and the three bears..   There is too high... Too low and Just right...   Too low and you lose capacity and this causes sulfation, which will cause overheating, excessive water use, and will lead to failure.   This is the most common way an FLA battery bank dies is low SG's are not corrected soon enough and the bank sulfates.

Too high, and you'll get great capacity, for a while, but that higher acidity will cause corrosion on the plates which will act a lot like sulfation.   On these, you will often see a darker electrolyte as the higher acidity/corrosion is eating away at the active material of the plates.

To figure this out what you need to do is...

1. Charge the bank to what you think is full or close to it..
2. Find the 10 Hour Discharge Rate of the bank.  (C/10 Discharge Current)
3  Apply load as close as you can get it by running loads in the house.   You will be running this test for 2-5 hours depending on test results.
4. Monitor battery voltages during this test every 30-60 mins.

individual battery voltages should stay pretty close to each other as they discharge,   If you start to see one or two batteries sag in voltage before the rest you have weak or dying cells.
My bet is you have 1 or two cells that have failed and this is the reason for the LBCO...

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Steve Higgins ⋅ Technical Services Manager
t +1.902.597.4020  m +1.206.790.5840
f +1.902.597.8447  e steve at surrette.com<mailto:steve at surrette.com>
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On Wed, Jul 21, 2021 at 7:24 AM Jay <jay.peltz at gmail.com<mailto:jay.peltz at gmail.com>> wrote:
And what color is the electrolyte?

On Jul 21, 2021, at 8:02 AM, Jay <jay.peltz at gmail.com<mailto:jay.peltz at gmail.com>> wrote:

Hi Jeremy

I would like to know brand and model of battery first.

Jay
Peltz power

On Jul 21, 2021, at 7:22 AM, Jeremy Rodriguez <allsolarjeremy at msn.com<mailto:allsolarjeremy at msn.com>> wrote:

 What’s going on with a battery bank that reads 1.275 SG on all the batteries but one, which has cell readings slightly higher.
The bank is probably 7 years old and this is not a full time residence.
It’s shutting down with LBCO error.
I need to go check the site, but I’d expect a dead or weak cell here.
What else can be checked , battery wise?

Jeremy Rodriguez
Solar Installation / Design Expert
All Solar, Inc.
1453 M St
Penrose Colorado 81240

Sent by Jeremy's iPhone. Sorry for typos and shorthand.
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