Weird issue with 6000XP 🤷‍♂️
- Thread starter ChrisSwolls
- Start date
ChrisSwolls
New Member
So discharged the bank a bit more lastnight. They discharged unevenly for sure, I set charging amps to 5 for it to come back up.
That was at the end or close to the end of discharge after lastnight. No chargeverter yet, it’s ordered but waiting for the next ship date. I’ve just been charging off PV for now. The cells were hitting BAL yesterday but I also have over voltage protection and alarm listed in BMS.
ChrisSwolls
New Member
Yeah, just the SOC difference and why one or 2 is getting drug down more than the others. It sounds like that might be normal though so no biggie there.
The Deltas are looking much better, still getting Overvoltage alarm and protection mode around 3.4xV per cell which seems off, but I’m guessing cycling them will help.
ScrotpusGobbleBottom
Corn Pop was a bad dude.
It is kinda off but there is A LOT of energy between 3.40 and 3.49 That simply means that you might have a ways to go if most cells are at 3.45 and some hit 3.65. Cycling will fix this, but the best thing to do is hold the cells at just under protection activation voltage. The balancer is triggered at a specific voltage you need to stay at or above there. What I do periodically is watch cell voltages like a hawk, wait till the balancer starts, and then lower the current enough so that I am charging but only enough to hold the voltage, not necessarily to "charge" the battery. The idea is to minimize voltage gain and staying in the balancing V as long as possible.
Do you know when your battery starts balancing? The triggers are cell voltage and a 10mv delta usually.
ChrisSwolls
New Member
I missed it today, I believe around 98% total SOC they start or 3.4v per cell on average. I’ll watch it close tomorrow, I had to switch the house off the system and to grid tonight to run the jacuzzi. For some reason the jacuzzi does not like during on the XP. Not sure if it’s a load issue as I haven’t been actively watching when it trips or, if it’s a weird GFCI thing. I plan to play around with that tomorrow and check.
I think when I get home from work at 6am I’ll shut off the PV, run a little 800w heater while I sleep.
I want to get it to 90% total SOC-ish and charge real low like you mentioned at 2A
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ScrotpusGobbleBottom
Corn Pop was a bad dude.
good plan!
ScrotpusGobbleBottom
Corn Pop was a bad dude.
I do not like the fact that it is balancing at 3.385. I never start until a cell hits 3.45.
Probably just my preference, and possibly doesnt matter, I dont know. BUT if I am right, you may be chasing your tail a little bit.
Can you change the balance turn on voltage?
Probably just my preference, and possibly doesnt matter, I dont know. BUT if I am right, you may be chasing your tail a little bit.
Can you change the balance turn on voltage?
ChrisSwolls
New Member
I’m not sure, I haven’t played with any of the BMS settings, so they need a password to access? I did think that was weird also, I thought it should be mid 3.4x range. The cells should also be getting above 3.4x without hitting Over volt and the BMS cutting out I believe.
@EG4_Jared any thoughts?
ChrisSwolls
New Member
Alrighty, kicked on the load, gonna grab some shut eye for a bit. Do these cell voltages look low for 100% SOC? Everything within the pack balanced out pretty well though. It’s set for a 2A slowwww charge.
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ScrotpusGobbleBottom
Corn Pop was a bad dude.
YES that looks right on target for a 17 amp draw on a 400 Ah battery.
You may not know, but If you charge a lifepo4 single cell to 100% It will (hopefully) stop charging when the cell reaches 3.65 and then if undisturbed with zero load it would settle around 3.45 or so.
This means that 3.33 with a 17 amp load on a 400 amp battery is perfectly fine.
This means the battery is fine, tho it doesnt mean it is balanced yet. 3.33 is not a good V to see imbalance.
The cell deviation really starts to show after 3.47 on a charger.
Cell deviation always looks fine at 3.33 with a healthy battery as it does with your batteries.
My goal is to have less than or equal to a .005 delta at 3.5v while charging. I believe that since I never charge to 3.65, why bother with any more than that..
You may not know, but If you charge a lifepo4 single cell to 100% It will (hopefully) stop charging when the cell reaches 3.65 and then if undisturbed with zero load it would settle around 3.45 or so.
This means that 3.33 with a 17 amp load on a 400 amp battery is perfectly fine.
This means the battery is fine, tho it doesnt mean it is balanced yet. 3.33 is not a good V to see imbalance.
The cell deviation really starts to show after 3.47 on a charger.
Cell deviation always looks fine at 3.33 with a healthy battery as it does with your batteries.
My goal is to have less than or equal to a .005 delta at 3.5v while charging. I believe that since I never charge to 3.65, why bother with any more than that..
ChrisSwolls
New Member
That was before I threw the load on it I believe.
ScrotpusGobbleBottom
Corn Pop was a bad dude.
The second picture says it has a load. Were the pictures taken the same minute or so?
ChrisSwolls
New Member
The BMS pic was taken first. I wanted to see what they settled at after sitting for the night and topping off the charge after I left for work lastnight. The second was after I turned the heater on. If you check the pic, the current section has 0’s.
ScrotpusGobbleBottom
Corn Pop was a bad dude.
I see now. Im still thinking everything is fine. This could imply that you are a little further away from balanced tho.
Need to see what it looks like when the cells are charging and around 3.48
brucenolan
New Member
As ScrousGB said, you need to see delta while charging at 3.48/cell and above. your cells are way out of balance and need to be held at balance voltage but below protection voltage for some time. The BMS in the Lifepower4 pack does not have much balance current, it took me a week of charging, (24/7) with a varible power supply pushing up the CV setting slightly as needed till I got to 3.6 per cell and under .020 delta on ONE pack. that is why I open and charge the low cells one at a time to balance new packs. if you continue as is the stock BMS will eventually balance out the cells, might take months !! however the 6000XP default CV (setting #7)is pushing you into protection. thats not helping. How are you holding voltage during charge to 2 amps?
brucenolan
New Member
firmware on his batteries start balance at 3.45 and continue to balance high cells till all cells fall below 3.45, password protected parameters not sure if EG4 will give up the password
brucenolan
New Member
here is the power supply I use to balance: any similar would work
link to Amazon:
link to Amazon:
ChrisSwolls
New Member
So I just went out and checked. When set at 2A I didn’t see any positive current on packs 1 & 2, but saw amperage on packs 3 & 4. See first pic.
I then upped charge current to 7A, that’ll be pic 2.
I finally settled at 10A, that’s pic 3,
I’m starting to pull my hair out with this. lol. I’m hoping my chargeverter gets in sooner, rather than later. I’m chasing my tail here, can’t get cell voltages to 3.4x without overcurrent protection. I’m going to let it charge at 10A for a bit and try dropping it down to between 2-5 once it gets closer.
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ScrotpusGobbleBottom
Corn Pop was a bad dude.
looks good at 10 amps. Give it some time.
Did you mean over voltage protection??
If it says over current protection that would be a different issue.
ChrisSwolls
New Member
Correct, cell over voltage alarm and the protection mode. I worded that weird lol
brucenolan
New Member
Chris, how are you adjusting charge current?
ChrisSwolls
New Member
Via the inverter or EG4 monitor. I then verify with comms hub and ammeter that it’s close.
brucenolan
New Member
so on the 6000XP you are adjusting current at setting #6? or in monitor.eg4electronics.com at maintenance tab for charge settings, what is the "charge voltage (V)" right below "charge current limit(Adc) set to?
this is where you can set voltage to stop from hitting "overvoltage protection" if you set the current limit and leave this at default (56.4) the 6000XP will try to output current and push voltage to this set point,
if you set voltage lower 6000XP will taper current as needed to hit voltage set point and keep your batteries out of overvoltage and allow BMS to balance the cells
this is where you can set voltage to stop from hitting "overvoltage protection" if you set the current limit and leave this at default (56.4) the 6000XP will try to output current and push voltage to this set point,
if you set voltage lower 6000XP will taper current as needed to hit voltage set point and keep your batteries out of overvoltage and allow BMS to balance the cells
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ChrisSwolls
New Member
To adjust the settings, that is correct. I either set it on the unit itself (I still just follow the book for now lol) or use EG4 monitor with my laptop sitting next to the unit. I’ve primarily been using the monitor app.
All the settings were set by Sig techs after I called in, the only thing I played with was lowering the current, to hopefully slow charge so they can balance out a bit more.
Current is currently set to 10A, charge voltage is set to 56.4. I’ll lower charge current a bit, the batteries are close to 100% for the day.
What’s weird though is overall SOC is saying close to 100% but cell voltages look kinda low for that?
All the settings were set by Sig techs after I called in, the only thing I played with was lowering the current, to hopefully slow charge so they can balance out a bit more.
Current is currently set to 10A, charge voltage is set to 56.4. I’ll lower charge current a bit, the batteries are close to 100% for the day.
What’s weird though is overall SOC is saying close to 100% but cell voltages look kinda low for that?
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brucenolan
New Member
Well, you can leave the setting as adjusted by SigSolar and cells will eventually balance. (You will be bald by then)
lowering the current will not slow the charge as the runner cells will over voltage protect (OVP) because even 2 amps at 56.4 V will push runner cells up, lower charge voltage will stop that and allow BMS to balance. I suggest start at 55.0 volts and check the cell voltage on the high cells to keep below OVP and move up charge voltage as delta come down, will take time.
My batteries float at 54.0 and show 100% after absorbing at 55.4 and all packs are < 0.020 delta at 55.4 (most are < 0.010)
I don't think the BMS looks at cell voltage for SOC, looks at total pack voltage
lowering the current will not slow the charge as the runner cells will over voltage protect (OVP) because even 2 amps at 56.4 V will push runner cells up, lower charge voltage will stop that and allow BMS to balance. I suggest start at 55.0 volts and check the cell voltage on the high cells to keep below OVP and move up charge voltage as delta come down, will take time.
My batteries float at 54.0 and show 100% after absorbing at 55.4 and all packs are < 0.020 delta at 55.4 (most are < 0.010)
I don't think the BMS looks at cell voltage for SOC, looks at total pack voltage
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