Yeah, I was watching a few of his videos and he's seen this thread and said it's the exact issue that he had, but I thought a battery re-calibration got him up and running again at least for the ones that didn't require a BMS replacement. I'm down for whatever - just want to get more than and 81% avg of my batteries.This sounds kinda similar to what Jeff was experiencing and he had to have the BMS replaced.
I would come to the conclusion that if my batteries are charged to 56 volts and held there for a time then go down to float then they are pretty much charged
However the battery monitoring system tells me it is 84% SOC, that tells me that the monitoring system is out of whack.
They where at one point all sync'd but now they are wonky... BMS_Test reflected the same results. About 5 mins later on my setup they all said 56.2-3 on the battery voltage and the MPPT was in absorption state... Been working with Sean at SS a couple times but calling is better than emailing...
@EJansen Im not sure what exactly you mean by "recalibration" but here is a post where I wrote out detailed instructions on how to top-balance each battery separately and then deep cycle them. Is this what you are looking for? I based my post off of a post Ben from SS made.
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eg4 6500 with eg4 battery operation question
Not sure if it matters but I have the first gen eg4 6500 that were sent out, I am just now getting it wired and connected. I have updated the firmware with the current upload and have removed the ground/neutral bond screw. I Have good communication now between the inverter and the battery. I am...diysolarforum.com
I wasn't sure if this was an issue with the battery / BMS or not. I was using Solar Assistant which just averages the SOC from each battery and reports that. I know some folks prefer to use the Victron Smart Shunt or others and add that into solar assistant as well, but I haven't gone that route as of yet - not sure I will.@EJansen Are you sure this is an issue with the batteries themselves and not the monitoring system you are using? In one of your posts you show the voltage of the batteries all pretty much the same, but the SOC all over the place.
I didn't do them all separately and I think that was part of the issue regardless of going well under 20% DOD on my test case / battery, so after going through what was sent to me today by Tim @ SS, I started with battery #6, the biggest problem child, and shut all other batteries off. I then set the dip switches on battery #6 to what I had on battery #1, disconnected all other battery communications, rebooted the battery, and then disconnected / reconnected SA. It now saw only that one battery in SA, and then I was on a mission to drain it to 46V. It took far longer than I thought it would. Even when it got to 0% and I was pulling almost 5K out of that one battery, it wouldn't die:Have you tried top-balancing each battery separately and then reconnecting them and deep cycling them?
Be aware when charging that the inverter will not charge with both grid and solar at the same time. Even if you have it set that way. It will only charge from Solar first and then once Solar is completely gone, then it will charge from grid.I wasn't sure if this was an issue with the battery / BMS or not. I was using Solar Assistant which just averages the SOC from each battery and reports that. I know some folks prefer to use the Victron Smart Shunt or others and add that into solar assistant as well, but I haven't gone that route as of yet - not sure I will.
Yeah, I noticed the voltages as being the same as well, so I wasn't sure what was going on.
I didn't do them all separately and I think that was part of the issue regardless of going well under 20% DOD on my test case / battery, so after going through what was sent to me today by Tim @ SS, I started with battery #6, the biggest problem child, and shut all other batteries off. I then set the dip switches on battery #6 to what I had on battery #1, disconnected all other battery communications, rebooted the battery, and then disconnected / reconnected SA. It now saw only that one battery in SA, and then I was on a mission to drain it to 46V. It took far longer than I thought it would. Even when it got to 0% and I was pulling almost 5K out of that one battery, it wouldn't die:
View attachment 149859
That appeared to be a good thing though. I got it down to about 47v before the larger loads couldn't be powered anymore, and the inverters kept shutting off, so I figured that was good (I had the inverters configured to shut off if the batteries were less than 5%). I then turned the solar and grid back on to start the charging process, but hours later, I'm only at 10% and the battery isn't charging for some reason - this is the part thats also been killing me. This screeshot is from a few seconds ago and it's currently set to 'Solar/Utility/Battery':
View attachment 149860
Now what? How do I get it to charge?
Also, since I didn't mention it earlier - I've been in USER mode almost since inception and I've stayed there. I had all of the settings that outlined below, I just had a different charging current. I set it to 40 just to try exactly what was suggested though, but it still doesn't charge.
Program / Description / Setting
02 / Maximum charging current / 40
05 / Battery type / USE
26 / Bulk charging voltage / 56.2v
27 / Floating charging voltage / 54.0v
Update, 15 mins later, it's now at 11% and charging at 56 watts, but then throttles back to 0 - I have no idea why it's doing that; that's definitely not 40 amps.
View attachment 149864
Yeah you will probably have problems balancing all of them at the same time like that. Hopefully doing each one individually will work.I didn't do them all separately and I think that was part of the issue
20% for LiFePO4 is 51.6V
I was trying to charge at night, so there was no solar. As of this morning, it's still at 11% - but the screenshot below was what I sent to support last night.Be aware when charging that the inverter will not charge with both grid and solar at the same time. Even if you have it set that way. It will only charge from Solar first and then once Solar is completely gone, then it will charge from grid.
Not sure if the timing then you were trying to charge, so I figured I would throw that out there.
Also, there’s a max charge setting on the inverter for amperage but there’s also a grid charge setting as well. 2 and 11 I believe.
All my charging was done by PV input, when I discharged one battery to 45 volts and shut down my inverter I turned that battery off to reset and also turned on another of the battery bank stated the inverter then turned on the reset battery and then I turned off the other battery so that just the reset battery would charge as the high voltage of the other could upset the charging. I then found that the reset battery was not charging well so shut off the inverter turned it back on again and the charging rate went up and eventually that battery che=arged to 99% SOC.
It’s almost like the OCP isn’t set right in the BMS.I was trying to charge at night, so there was no solar. As of this morning, it's still at 11% - but the screenshot below was what I sent to support last night.
It looks like this might be the culprit:
View attachment 149928
Every time it attempts to charge, Cell1 throws and over current protection alarm and then it stops charging. So the fans ramp up like it's ready to send it, then the over current protection is triggered and it goes back to not charging.
It’s almost like the OCP isn’t set right in the BMS.
Yeah, when you have the battery hooked up in parallel with the other batteries, the current is being split between all the batteries you have connected. So each battery is only getting a percentage of the total power coming in. I’m wondering if the current is under whatever threshold is set in that specific BMS, and that’s why it’s letting it charge.I'm also wondering if maybe by itself it says that it doesn't want to charge, it rejects it and the inverter stops sending it - but as soon as the others say they do want to charge, and since it's on the same bus bar, it's somehow charging because of that? Pure speculation / no idea how it works.
There's no communication between the batteries in the inverter, so it sounds like it's up to the BMS if it wants to accept the charge.
After turning all of the other batteries on it decided that it wanted to charge.. What is going on here?
Im guessing this is what was happening.Yeah, when you have the battery hooked up in parallel with the other batteries, the current is being split between all the batteries you have connected