Lifepo4 dead HELP

[740GLE]

Why discharge it all the way, when you can just discharge one or two cells to balance the cells out. You’ve already cut open the enclosure.

Was mentioned back on page one.

 

[Texas-Mark]

Why discharge it all the way, when you can just discharge one or two cells to balance the cells out.

Balancing is not the only problem and not the reason for discharging. Somehow the BMS got messed up and is reporting the pack as a 3 string not a 4 string. This is causing the BMS to report the wrong total pack voltage and thus causing some settings not to function properly. He is trying to get the BMS to reset if possible (sort of a last resort). He already tried unplugging the balance cable to try and reset it. And yes, the sense cable is good, it was tested and the BMS is reporting the correct individual cell voltages. But since it thinks it is a 3 string, it is only reporting around 10V total (even though actual output voltage is around 13V). That of course messes with the the low voltage cutoff as well as other settings. You need to read the whole thread.

 

[timselectric]

Does this BMS have a setting for how many cells?
Maybe it was accidentally changed to 3?

 

[Mickie]

Does this BMS have a setting for how many cells?
Maybe it was accidentally changed to to 3?

There is no way to change the parameter as far as i can see.
If i disconnect the the balance wires from yhe bms it shows 13+ volts at the terminals but once i reconnet the balance wires it shows 5+ volts but i test each wire for continuity and they are all good and in the app all cell show with correct voltages its just as a pack its reading 3 cells instead of 4.

 

[Mickie]

I just noticed something. When i remove the temprature connector im getting 12.24v at the terminals. When i reconnect it i get 5.7 but in the app its still saying 3 string

 

[Texas-Mark]

When i remove the temprature connector im getting 12.24v at the terminals.

What temp reading does the app give it's when disconnected? I could see it causing the reported temp to go to an extreme. But usually that would result in BMS shut down.

If i disconnect the the balance wires from yhe bms it shows 13+ volts at the terminals

It's looking more and more like the BMS has some serious issues. Disconnecting the sense leads should disable the BMS, not enable it.

Might be time to just get a new smart BMS. like a JBD.

 

[Mickie]

What temp reading does the app give it's when disconnected? I could see it causing the reported temp to go to an extreme. But usually that would result in BMS shut down.


It's looking more and more like the BMS has some serious issues. Disconnecting the sense leads should disable the BMS, not enable it.

Might be time to just get a new smart BMS. like a JBD.

Thise are the temprature reading when disconnected.

 

[John Frum]

https://eepower.com/resistor-guide/resistor-types/ntc-thermistor/#

 

[D71]

I’m not confused. … This forum was not acting right yesterday. Could not see all your posted pictures and such.

How many of these himassi batteries do you have? You stated earlier mucked with bms settings in this one then current problems began.

This is basic logic.
Troubleshooting 101 was it working before you mucked with it? ‘You admitted it was most likely you for creating the current problem”.

Why not read your other battery then change settings to unmucked defaults?
Or did you muck with both and settings are same on both bms?
In other words: Are you only having problems with this one battery?

what program in in attached picture… did you use it to change settings?

 

[Mickie]

I’m not confused. … This forum was not acting right yesterday. Could not see all your posted pictures and such.

How many of these himassi batteries do you have? You stated earlier mucked with bms settings in this one then current problems began.

This is basic logic.
Troubleshooting 101 was it working before you mucked with it? ‘You admitted it was most likely you for creating the current problem”.

Why not read your other battery then change settings to unmucked defaults?
Or did you muck with both and settings are same on both bms?
In other words: Are you only having problems with this one battery?

what program in in attached picture… did you use it to change settings?

I have 4 battries. They all had the same settings. The part that i messed with wasnt in that picture. I was using a different app where i could turn on and off the cmos and dmos. I turned off the dmos and the bms went into sleep mode. I used the smart charger which is a AC charger to wake up the bms and when it woke up the in the app it was showing 3 strings 10+ volts.

 

[D71]

I have 4 battries. They all had the same settings. The part that i messed with wasnt in that picture. I was using a different app where i could turn on and off the cmos and dmos. I turned off the dmos and the bms went into sleep mode. I used the smart charger which is a AC charger to wake up the bms and when it woke up the in the app it was showing 3 strings 10+ volts.

person known as “ amples“ on these forums experienced something similar = why wanted you to message that person. They reported their ac wall charger blew up….

it was working fine before you messed with it other then cells mismatched…. Correct?

My best advice again is contact Himassi. Explain what has happened see if they will help you.

 

[Mickie]

person known as “ amples“ on these forums experienced something similar = why wanted you to message that person. They reported their ac wall charger blew up….

it was working fine before you messed with it other then cells mismatched…. Correct?

Yes it was working fine apart from cells not balanced.

 

[D71]

Yes it was working fine apart from cells not balanced.

Thank you … being honest in this day and age is admirable.

Please to save your money contact himassi. They took care of my problem. They might help you or offer a bms or sell you a bms. We all learn and more so from mistakes sometimes. I make screw ups all the time. It is why and how we keep learning. It sucks for right now. School of hard knocks.

again contact Himassi

 

[Mickie]

Thank you … being honest in this day and age is admirable.

Please to save your money contact himassi. They took care of my problem. They might help you or offer a bms or sell you a bms. We all learn and more so from mistakes sometimes. I make screw ups all the time. It is why and how we keep learning. It sucks for right now. School of hard knocks.

again contact Himassi

I tried emailing them but no reply. I wasnt the one who purchased them so im unable to contact them thru amazon.

 

[Texas-Mark]

I was using a different app where i could turn on and off the cmos and dmos.

So this is not the correct app? I wonder if when you thought you were turning off the dmos, it actually changed the string number and just appeared to turn it off because it then thought it had low voltage which would have turned it off.

 

[D71]

I tried emailing them but no reply. I wasnt the one who purchased them so im unable to contact them thru amazon.

Given ppl say they are same as chins…… Screen shot Taken from Will’s video are all the connections the same as this pictured screen shot.
In other words did you pull any pins?

I have 35-40 yrs electrical experience…. Seen a lot of weird things.

Electricians used to create problems all the time by jamming the meter leads into the plugs and opening - damaging the female pins.
There is a spring like feature in these pins that will get spread and not make good contact with the male pin end. Hot dog down the hallyway.

I think you damaged this when you were incorrectly checking total cell voltage and only going across 3 cells for reported ~10. Volts
vs going across all 4 cells. Did you take a reading and jam the meter lead into this plug end and possibly damage the female pin. Wallow it out.
it only takes a little bit damage spread to lose this connection. Fixing it is a pita. You have to determine which pin is the probe per unreported cell … then use a needle - pin to fix it - try to pick it until makes a tight connection again.

never shove a meter lead in these type plugs female pins.

you might be able to see it with naked eye or magnifying glass

 

[Mickie]

Given ppl say they are same as chins…… Screen shot Taken from Will’s video are all the connections the same as this pictured screen shot.
In other words did you pull any pins?

I have 35-40 yrs electrical experience…. Seen a lot of weird things.

Electricians used to create problems all the time by jamming the meter leads into the plugs and opening - damaging the female pins.
There is a spring like feature in these pins that will get spread and not make good contact with the male pin end. Hot dog down the hallyway.

I think you damaged this when you were incorrectly checking total cell voltage and only going across 3 cells for reported ~10. Volts
vs going across all 4 cells. Did you take a reading and jam the meter lead into this plug end and possibly damage the female pin. Wallow it out.
it only takes a little bit damage spread to lose this connection. Fixing it is a pita. You have to determine which pin is the probe per unreported cell … then use a needle - pin to fix it - try to pick it until makes a tight connection again.

never shove a meter lead in these type plugs female pins.

you might be able to see it with naked eye or magnifying glass

Its the exact setup like the one in will's video. Remember the 10 volts was even before i opened the battery up so it wouldnt have been an issue with the meter and pins.

 

[Mickie]

I just think waking up the bms did some sort of damage to it and i will just have to reolace the bms. Hope i can find one that can work with these 3 battries as i dnt think ill get back the same VIP bms .

 

[D71]

I just think waking up the bms did some sort of damage to it and i will just have to reolace the bms. Hope i can find one that can work with these 3 battries as i dnt think ill get back the same VIP bms .

Did you look at end of that plug…. I have literally seen this damage thousands of times. If your vision is not as old as mine you can see if it is spread takes all but few minutes…. To look.

When you posted your picture you were measuring the battery voltage across 3 cells with the meter…. that would be 10 volts.
when you read the plug it reported correct voltage. If it is not the plug female pin spread then bms - software.

the only reason am trying to help you is you seem honest. Admit you messed it up. I have dealt with liars my entire career…. I am retired now.

look at end of the plug to see if pins are damaged…. Never stick a meter lead in a plug like that. There are special pin ends to test them…. Or back probing is other way…. Yours’ is sealant covered. Humor me… look at the pins see if they look like the negative pin… black wire. We know it works

 

[Mickie]

Im charging it up now to try something so once the charger shuts off ill check the pin.

Did you look at end of that plug…. I have literally seen this damage thousands of times. If your vision is not as old as mine you can see if it is spread takes all but few minutes…. To look.

When you posted your picture you were measuring the battery voltage across 3 cells with the meter…. that would be 10 volts.
when you read the plug it reported correct voltage. If it is not the plug female pin spread then bms - software.

the only reason am trying to help you is you seem honest. Admit you messed it up. I have dealt with liars my entire career…. I am retired now.

look at end of the plug to see if pins are damaged…. Never stick a meter lead in a plug like that. There are special pin ends to test them…. Or back probing is other way…. Yours’ is sealant covered. Humor me… look at the pins see if they look like the negative pin… black wire. We know it works

Im charging it up now to try something so once the charger shuts off ill check the pins