Growatt3000 24v with Daly100A BMS unit settings and issues.

[schroederjd]

Really glad to hear this. I'm in the same spot (firmware updater completed the erase, then hit a 'Unhandled Exception' error, and now it won't do anything!). I'll try a new cable. Not sure where to find another PC...

Well, I've now tried two cables on two different computers. The second computer seemed to have more success uploading the firmware (it made it through the "program" and "verify" steps; however, the inverter would never restart after the update. It would just keep beeping. And after powering it down and restarting in manually, it was still 'dead' (bank screen, continuous beeping, and red flashing LED). I've tried two different firmware versions (20200316 and 20200707). Going to take one last stab at it using the newest ISP tool (V4.20), but I'm not hopeful.

Any other suggestions?

 

[gdpetti]

Yes... seems to be working after another issue with the BMS... so now, it seems a matter of tweaking the settings as Ian said.... Understanding them would come first, but it is shutting off and on regularly.. OSIS.... I was a little late checking it last night and this morning, but before it would have been having that same problem. I'll continue to check in the following days.
Thanks.

 

[Zwy]

Yes... seems to be working after another issue with the BMS... so now, it seems a matter of tweaking the settings as Ian said.... Understanding them would come first, but it is shutting off and on regularly.. OSIS.... I was a little late checking it last night and this morning, but before it would have been having that same problem. I'll continue to check in the following days.
Thanks.

The video I linked is the best info I've found out there for settings. Steve Reel did a great job showing the settings and explaining them. My best advice is watching the video several times, comparing your settings to what he describes in the video.

As I stated, your setting on #21 needs to be set high enough over your BMS. Second, any voltage drop from battery to Growatt on both negative and positive sides of the circuit can cause the Growatt to hit low voltage cutoff under load. The voltage drop needs to be checked under load, preferably under the highest load. If you are drawing 130a and have 2 volts voltage drop, the Growatt will most likely think there is a low voltage cutout situation.

 

[Zwy]

Yes... seems to be working after another issue with the BMS... so now, it seems a matter of tweaking the settings as Ian said.... Understanding them would come first, but it is shutting off and on regularly.. OSIS.... I was a little late checking it last night and this morning, but before it would have been having that same problem. I'll continue to check in the following days.
Thanks.

What size is your Daly BMS and what are the settings you are using?

 

[gdpetti]

For Program #21, Low Volt Cutoff, the setting is 21.4.... the battery cells are listed as 2.5/cell, so 20, so I put 21.4 for low volt cutoff. As for the BMS, I just put a new Daly BMS on it.... had problems with previous Daly... this one is just a little larger... common port 24v 200a/100a DL8S (3.2v rated LifePo4), figured I'd just get the larger one in case I need extra charging at some point. I had the 100/50a unit before. This current model is #18650. Overcharge is 3.75v, overdischarge 2.2v, charge current is 29.2v.

I have the Growatt set at 29v bulk, currently trying absorb at 28v instead of the previous 27.2... seemed fine all day after install.... but same problem tonight again... same 15 minute sequence even as I play with the settings... can not get that beep to stay off... seems to stay off in 'alarm' mode, but each time I check back, the beep setting for 15 is always 'on' as this problem sets it off. Turning it off again does nothing... tried Ian' suggestion, but that doesn't work.

But this real problem seems to be with the solar only charging after sunset, right? I haven't waked up early enough yet to check the sunrise situation, I just missed it this morning... unit was already on with the sun just peeking thru the trees on the horizon. So, I'll have to check the morning situation, but now, the sunset shutdown seems more important. Could it be the OSO setting in Program 14?

One difference was that I babysat the unit before/during sunset and noticed it stayed at 26.1 as the sun set.... not 27 like last night. Tried lowering Program 11 to 10a, but that didn't seem to do anything.... at least not unless you need a day of shutdown to reset the program settings. If the setting of OSO is set, it seems the unit isn't configured to recognize that the sun is setting, so no alarm or beeping necessary to let me know it can't charge anymore. I can see the charging off solar on screen go on and off as the sun sets.... voltage stays on 26.1 for the battery this night, not 27 as last night. The new Daly is 3.2v rated... but wasn't the last one as well? Either way, the alarm setting for Program 17 seems to stay in 'off' mode whenever I check it... it is the beepin in Program 15 that doesn't stay in 'off' mode when checked, but wouldn't this sunset problem of solar charging shutting down be an 'alarm' issue, not regular beeping? I did see the charging light go off and the fault light flick on for a quick flash before sunset as the charging was going out with the limited sunlight, but it didn't stay on, just flashed and the charging stayed off for a few seconds until the solar charging would start up again... this went on quite a while till the beeping and no sun, no charging problem started.

The unit seems to be sending an alarm beep, not a regular beep, no? Whenever checked, the 'alarm' program is 'off', but the beep program in 15 is on again.... every time... can't keep it in 'off' position. Is this sunset in OSO mode a 'usual' thing? Is it to be expected? If so, then the only real problem is the beeping or alarm telling me so.

 

[gdpetti]

Made it out early this morning to the campervan (off grid setup).... similar but different, unit was off, no backlit screen... before sunrise.... then unit came on and fans started the same cycle... couple seconds on, then off and alarm beeps... the alarm symbol shows up on screen... then about 30seconds... and once again... BUT then, the charging started but failed after but more than 30seconds.... 45 to a minute... then the fans, alarm beeps... stops and then after a few seconds... not sure, maybe 15 to 30, the solar charging attempted again... failed... but it took a minute before the fans/alarm beeps... that was the fourth time... maybe fifth, not sure... but after another minute the solar charging took hold. So, the morning cycle is same but shorter due to the light increasing, even if panels aren't producing much as the sun hadn't even risen yet, but the sky was well lit. Sort of opposite of the sunset/twilight problem as when it stops cycling(fans/alarm), then the screen shuts off as well... doesn't stay on at night.

So, I'm watching the video again... he says the in Program 1, SOL doesn't run off battery unless the solar panels are working, so you can't use SOL after sunset, as the battery won't engage, it will switch to grid, or try to, which is what the fans are trying to do, right? Isn't that why the are coming on? then the alarm? even if the alarm is turned off... but after the alarm sounds, the beep program seems to go to 'on' position again.
So, I need to setup Program 1 with SBU.... both it and SOL are based on Program 12 (switch to grid) which is set at 23v, but it shouldn't do so if my battery is still showing 26v or more, right? I think this is what is happening. It's trying to switch to grid too early because the solar panels are shutting down... All this and I have next to ZERO draw on the batteries... under .5 v.... goes down to .05 even... so it isn't a load issue. It seems to be either a settings issue or the unit is bad... if I can't tweak the settings, then will a firmware update fix it? Ian didn't think so... but his idea on fixing the beeping didn't work either. The beeping stays 'off' only until this after sunset/before sunrise problem of the solar panels going to sleep/waking up starts. The alarm icon shows up on screen even if it says 'off' in Program 17....once it starts, the beeping program for Program 15 returns to 'on' position.
Maybe I should try lowering Program 12 below the default 23v? Is this shutdown problem(fans/alarm) of the solar panels typical of this unit?
Wondering about Program 13... switch back to battery from grid at what voltage? Default is 27, but since I don't have the grid plugged in, should I reduce it lower? Trying to find the problem with these settings.

 

[Zwy]

Made it out early this morning to the campervan (off grid setup).... similar but different, unit was off, no backlit screen... before sunrise.... then unit came on and fans started the same cycle... couple seconds on, then off and alarm beeps... the alarm symbol shows up on screen... then about 30seconds... and once again... BUT then, the charging started but failed after but more than 30seconds.... 45 to a minute... then the fans, alarm beeps... stops and then after a few seconds... not sure, maybe 15 to 30, the solar charging attempted again... failed... but it took a minute before the fans/alarm beeps... that was the fourth time... maybe fifth, not sure... but after another minute the solar charging took hold. So, the morning cycle is same but shorter due to the light increasing, even if panels aren't producing much as the sun hadn't even risen yet, but the sky was well lit. Sort of opposite of the sunset/twilight problem as when it stops cycling(fans/alarm), then the screen shuts off as well... doesn't stay on at night.

So, I'm watching the video again... he says the in Program 1, SOL doesn't run off battery unless the solar panels are working, so you can't use SOL after sunset, as the battery won't engage, it will switch to grid, or try to, which is what the fans are trying to do, right? Isn't that why the are coming on? then the alarm? even if the alarm is turned off... but after the alarm sounds, the beep program seems to go to 'on' position again.
So, I need to setup Program 1 with SBU.... both it and SOL are based on Program 12 (switch to grid) which is set at 23v, but it shouldn't do so if my battery is still showing 26v or more, right?

I've stated since the beginning it should be SBU. SOL will attempt switch to grid.

You could set setting #12 to 21v, or even 20.00v to see if the problem still occurs.

I think this is what is happening. It's trying to switch to grid too early because the solar panels are shutting down... All this and I have next to ZERO draw on the batteries... under .5 v.... goes down to .05 even... so it isn't a load issue. It seems to be either a settings issue or the unit is bad... if I can't tweak the settings, then will a firmware update fix it? Ian didn't think so... but his idea on fixing the beeping didn't work either. The beeping stays 'off' only until this after sunset/before sunrise problem of the solar panels going to sleep/waking up starts. The alarm icon shows up on screen even if it says 'off' in Program 17....once it starts, the beeping program for Program 15 returns to 'on' position.
Maybe I should try lowering Program 12 below the default 23v? Is this shutdown problem(fans/alarm) of the solar panels typical of this unit?

With fans running, I doubt it is a low voltage cutoff, that would tend to drain the batteries faster. Possibly overload on amps. Do you have an amp clamp?

Wondering about Program 13... switch back to battery from grid at what voltage? Default is 27, but since I don't have the grid plugged in, should I reduce it lower? Trying to find the problem with these settings.

13 could be set higher or lower, I'd maybe go lower as you're not connected to grid power. But as I've stated before, if you have a large voltage drop in the system under load, it will cause the unit to come off and on as it tries to restart.

 

[gdpetti]

Yeah, I'm on SBU, just trying anything to see what happens... so far, nothing much... same result tonight. I did notice the charging went higher today... 29.8- 29.9 at times... even though the Bulk setting is 28.8.. and the float 28.2... maybe that did something? Low cut off still set at 21.4v
I did use the inverter to run a table saw for a little while... inverter later shut off, checked the battery level and it was down just under 25v and rising back up... cutoff level for Program12 is 22.5, so I suppose that did it. Program 13 is set to 25.5v. Not sure how low it got when it shut off, as I was outside. This use of the inverter was in the middle of the day.. not during the sunset solar shutdown problem. I keep adjusting the setttings a little, so I'd have to check again on what exactly they are.

Program 14 is still OSO.. I could do your Program 12 to 21v or even 20, the battery low volt cutoff point to test things. The booklet says Program 12 is default 23.0v but can go down to 22.0v. So, it seems I could try 22 instead of 22.5 as I think I last set it.

I think my meter has an amp clamp, but I literally have nothing running usually... amp draw is ~.5a when this occurs. I have a battery meter I'm checking against the Growatt. The interesting thing is that the shorter pre-sunrise process is similar to the post-sunset process of the fans kicking on for 2 seconds, and the alarm for 3 seconds, starting on the latter half of the fans' second second..... only the morning is getting lighter, so it only cycled about 4 times I think. Is this normal for only solar charging on this Growatt? Is this fan's coming on an attempt to go to grid? Nothing else is on screen... the alarm symbol shows up as the panels lose sunlight a few times and the charging stops. You can hear it click off. If the battery reading stays high enough, this shouldn't be happening, right?

 

[Zwy]

What do you have for a solar array and what is the VOC?

 

[gdpetti]

3 CSUN 310w mono panels... 60 cell... VOC is 40.0v
I set them up on the roof of the van in parallel mode because half the day is under a tree, even though it doesn't have leaves on it yet, and I think I'll send more time in those conditions than out in the open desert sun which is better for series mode. So, input doesn't seem a problem, even if the readings seem odd on the Growatt in PV mode, as if not reading at all... but since I'm not really/usually using the battery for an load yet, it shouldn't be charging much, right? I test stuff, but no regular loads... frig isn't on, nor the rest, even pulled the fuse on the little monitor for the heater which isn't being used, just to check the 'load'.
I take it that this 'problem' isn't normal for the Growatt? No one else has had this problem of the fans/alarm? No matter what my settings are at, it seems to remain... no change in that.

 

[Zwy]

3 CSUN 310w mono panels... 60 cell... VOC is 40.0v
I set them up on the roof of the van in parallel mode because half the day is under a tree, even though it doesn't have leaves on it yet, and I think I'll send more time in those conditions than out in the open desert sun which is better for series mode. So, input doesn't seem a problem, even if the readings seem odd on the Growatt in PV mode, as if not reading at all... but since I'm not really/usually using the battery for an load yet, it shouldn't be charging much, right? I test stuff, but no regular loads... frig isn't on, nor the rest, even pulled the fuse on the little monitor for the heater which isn't being used, just to check the 'load'.
I take it that this 'problem' isn't normal for the Growatt? No one else has had this problem of the fans/alarm? No matter what my settings are at, it seems to remain... no change in that.

At this point, as you have been in contact with Ian, I'd lean toward a replacement under warranty as there hasn't been a solution to the problem.

 

[gdpetti]

Well, after the firmware update, which helped... finally got rid of the beep, even if the icon remains on screen, but the US2 has to be used for LifePo and there is only one setting for bulk/absorption, no bulk, then absorb, changing one automatically changes the other, which isn't a problem, at least not now.
But I still had the up and down readings on for the battery voltage, which Ian said was the BMS. He recommended disconnecting the BMS and running a wire straight to the battery from the Growatt, which I did, and so far, it seems to have worked. The solar panels are all shaded now and not producing much, so I'll have to wait till tomorrow to see how high I can charge the battery, which under the Daly common port BMS, was stopping at 3.28v on the battery itself, but showing 25.7 on the Growatt, which had an 'open circuit' as Ian said which was causing the reading to go up and down from that 25.7 to 28, 29, 30 or 31 depending upon how high the charge setting was set.

Ok, so I need to test it tomorrow and see how it works out on OSO, solar charging only mode. It has already gone up to 26.4-6 depending upon any loads from the frig usually. So a little progress. If it keeps charging up to 26.8 or 90% SOC, it will seem to work, and I have the little ISDT BattGo attached to keep an eye on the cell balances, but if this works out, what to do with the 24v 3.2v Daly BMS? It is common port, so I guess that is why most people on this site use separate port, so they can control the settings.

 

[Just John]

Well, after the firmware update, which helped... finally got rid of the beep, even if the icon remains on screen, but the US2 has to be used for LifePo and there is only one setting for bulk/absorption, no bulk, then absorb, changing one automatically changes the other, which isn't a problem, at least not now.
But I still had the up and down readings on for the battery voltage, which Ian said was the BMS. He recommended disconnecting the BMS and running a wire straight to the battery from the Growatt, which I did, and so far, it seems to have worked. The solar panels are all shaded now and not producing much, so I'll have to wait till tomorrow to see how high I can charge the battery, which under the Daly common port BMS, was stopping at 3.28v on the battery itself, but showing 25.7 on the Growatt, which had an 'open circuit' as Ian said which was causing the reading to go up and down from that 25.7 to 28, 29, 30 or 31 depending upon how high the charge setting was set.

Ok, so I need to test it tomorrow and see how it works out on OSO, solar charging only mode. It has already gone up to 26.4-6 depending upon any loads from the frig usually. So a little progress. If it keeps charging up to 26.8 or 90% SOC, it will seem to work, and I have the little ISDT BattGo attached to keep an eye on the cell balances, but if this works out, what to do with the 24v 3.2v Daly BMS? It is common port, so I guess that is why most people on this site use separate port, so they can control the settings.

Most people here use common port, not sure why you think otherwise.
Seemingly random voltage fluctuations are usually a bad connection.
I am not sure why you are listening to someone telling you to try charging without a BMS, that is a really bad idea.

Obviously the Growatt that won't stop beeping can't be the problem, must be the BMS.

 

[gdpetti]

Well, like I said, the firmware update got rid of the beep, the program stays in 'off' mode, though the symbol remains on screen. I've tried all the connections, another Daly BMS, and as Ian said, it's the BMS going into 'open circuit' mode, if that term is correct, as I really don't understand it. Perhaps someone can explain it better, but the battery side was fine at 26.28, but the BMS/GW side was only showing 25.7v... but obviously it showed 26.28 like the battery once the BMS was disconnected. The question now is whether it charges up to 90% SOC at ~26.8v or not? So far this morning, it's all cloudy, so I'll have to wait a couple hours to really check the charge profile.

So far, it's done what Ian said it would. It looks like the BMS shut down at that 25.7v point. The solar charger stays on as before, and it would go active if a load was placed on it, so the panels and wiring all seem fine, but after the load (heat gun) was turned off, it would settle down some and recharge the battery back to that same 25.7v point and drift or go into float mode. The new firmware seems to have Program 19 and 20 at the same level, change one and it automatically changes the other, so no bulk then float. I've read somewhere that lithiums don't need to float. I know that most smaller electronics on lithium batteries drain down to 15-20% before we recharge them, at one speed, and when 'full', the device tells us to disconnect. So, this doesn't really surprise me.

It seems these GWs or All in Ones aren't compatible with these BMS's? Ian said the BMS's are his main problem. All I know is what I see. Has no one else had this problem when charging? Am I the only one? I'll have to check the charging today/tomorrow and then figure out what to do about the BMS situation. Will the GW charge up past 26.3/4? It was charging to 26.6 yesterday before the sun went behind the shaded tree. The only real load is the frig at up to 3 amps when the compressor comes on, which I can see the affect on the system/battery's charging. In solar only charging, it drained the batter back down to 26.3 it seems, so today I'll have to check the charging.

Remember this wasn't 'random voltage fluctuations', it was the norm. I put on a new Daly BMS and the same problem once that 25.7v point was hit... it went into 'float' and wouldn't go any higher. The solar charging stayed on, same as now, but the wattage/amps were small, only enough for any load. The watts pulled would go up as that refrigerator compressor turned on... but the watts would go back down when it went off.... maintaining the battery at 25.7v... the battery reading on the batter terminals themselves stayed around 26.3, but on the GW and wires before the BMS, they fluctuated up and down... from 25.7 to 28/29/30/31 depending upon the bulk setting.

So, I'll check the charging today once the clouds pass by.

 

[gdpetti]

Charging seems fine EXCEPT for one bad cell in the battery, that charges ~.5v faster/higher and discharges ~.7v faster with inverter on... Didn't notice this before, but I didn't watch the individual cell readings enough to notice. Not sure how much of this is causing the other issue with the Daly BMS. Would it operate ok if this bad cell was like the others? Otherwise, the GW seems to operate as expected. I need to replace this bad cell to test the Daly BMS though.

Is this cell fixable or not? It jumps up on charging by .5v ahead of the others and will go into overcharge if the GW isn't adjusted down more, which then shuts off the solar charging and takes the battery/GW back down to 26.7 to 27 and after a minute to 26.4v on each.

Is this cell fixable or not is the question now? Do I need to replace it? This cell is in position 5 of 8s alt layout. The 8th cell charges/discharges only a a little off the others, and as cell #8, that is probably expected? Cell 5 busbar has a regular piece of copper fitted from cell#4 as it needed to be a little longer to fit in the alt configuration, all the others use the regular copper with aluminum? cover to connect. This isn't the issue though is it? As it doesn't affect the others after it, osis, and the main terminals use just a copper washer over the terminal tops. It seems this cell is bad, is there another way to determine that?

 

[Zwy]

Yeah, I'm on SBU, just trying anything to see what happens... so far, nothing much... same result tonight. I did notice the charging went higher today... 29.8- 29.9 at times... even though the Bulk setting is 28.8.. and the float 28.2... maybe that did something?

Any higher than 29.2V can cause damage to your cells. I set mine at 28.4V max which is 3.55V per cell, I see no reason for higher. BMS is set for 29.2V.

Float set for 26.0 to 27.2V

Low cut off still set at 21.4v

That's good, what about the BMS? 2.6V preferred. And GW is set where?

I did use the inverter to run a table saw for a little while... inverter later shut off, checked the battery level and it was down just under 25v and rising back up... cutoff level for Program12 is 22.5, so I suppose that did it. Program 13 is set to 25.5v. Not sure how low it got when it shut off, as I was outside. This use of the inverter was in the middle of the day.. not during the sunset solar shutdown problem. I keep adjusting the setttings a little, so I'd have to check again on what exactly they are.

Program 14 is still OSO.. I could do your Program 12 to 21v or even 20, the battery low volt cutoff point to test things. The booklet says Program 12 is default 23.0v but can go down to 22.0v. So, it seems I could try 22 instead of 22.5 as I think I last set it.

I think my meter has an amp clamp, but I literally have nothing running usually... amp draw is ~.5a when this occurs. I have a battery meter I'm checking against the Growatt. The interesting thing is that the shorter pre-sunrise process is similar to the post-sunset process of the fans kicking on for 2 seconds, and the alarm for 3 seconds, starting on the latter half of the fans' second second..... only the morning is getting lighter, so it only cycled about 4 times I think. Is this normal for only solar charging on this Growatt? Is this fan's coming on an attempt to go to grid? Nothing else is on screen... the alarm symbol shows up as the panels lose sunlight a few times and the charging stops. You can hear it click off. If the battery reading stays high enough, this shouldn't be happening, right?

 

[gdpetti]

Hey Zwy, I did as Ian suggested, disconnected the BMS and it works... fine except that bad cell ... so I read up on this problem here and cleaning the busbars etc was the first move and WTF! Seems that was it.... on the main #5 cell , tested inverter... seems ok... in the shade now, and I'll clean that #8 cell negative terminal to see if the reading there changes, but it's only off .01v, so not really a problem right? Does the last cell/positive battery lead always show a slightly lower reading? Either way, I'll clean the negative, already cleaned the positive on #8 and no change... but it is reading normal charge/discharge otherwise.
So, I'll test again tomorrow to make sure... then the question is the BMS. Was this 'bad cell' the real problem it wasn't working properly? As Ian said about shutting the circuit and making it open so the GW showed such fluctuations? I'll have to test that, right? then test the program charging parameters. It is a real learning process for a newbie like me. I didn't see any dirt etc on that #5 busbar, but cleaned, sanded it anyway....

 

[Zwy]

Hey Zwy, I did as Ian suggested, disconnected the BMS and it works... fine except that bad cell ... so I read up on this problem here and cleaning the busbars etc was the first move and WTF! Seems that was it.... on the main #5 cell , tested inverter... seems ok... in the shade now, and I'll clean that #8 cell negative terminal to see if the reading there changes, but it's only off .01v, so not really a problem right? Does the last cell/positive battery lead always show a slightly lower reading? Either way, I'll clean the negative, already cleaned the positive on #8 and no change... but it is reading normal charge/discharge otherwise.
So, I'll test again tomorrow to make sure... then the question is the BMS. Was this 'bad cell' the real problem it wasn't working properly? As Ian said about shutting the circuit and making it open so the GW showed such fluctuations? I'll have to test that, right? then test the program charging parameters. It is a real learning process for a newbie like me. I didn't see any dirt etc on that #5 busbar, but cleaned, sanded it anyway....

I just wanted to point out where I set my Daly and GW, I'm only looking at charge cycles into about the 90% range of Ah.

What can occur is you have one cell that is a runner and the BMS cuts charging or discharge due to hitting the limits you set. What you want is to have the GW cut out before the BMS. I think this might be why you are seeing this behavior and then thinking it is a faulty BMS, when actually it is doing what it was designed to do according to set parameters. The GW should be set to cut charge and discharge long before the BMS. If the BMS sees a cell that is a runner and cuts off charge or discharge, then you need to change the settings on the GW to compensate for the runner cell.

 

[gdpetti]

Well, after cleaning, that cell doesn't "run" anymore... it's normal, and the same with the last #8 cell, only off ~.01v so not a problem, right? as it doesn't "run" either... all stable off the Daly BMS. So, I reattached the BMS this morning and back to the same problem of the fluctuating batt voltage on the GW monitor, while on the battery itself off the ISDT, it is normal charge/discharge.

If on the inverter, the BMS is stable ... usually at .7v below the battery reading off the ISDT cell meter, which I watch all the time now for comparison. Again, it's during the charging mostly I notice this low to high fluctuation, over and over, up and down every few seconds... 'open circuit' Ian said. The BMS seems to be shutting down the GW charging as it fluctuates up high over it's high voltage shutoff, but when I took the BMS off again, the system is stable... charging now nice and even.

So, bad BMS or what? It's common port, so fixed settings ~30v high cutoff and 17.6v? low cutoff? I don't have it here at the computer, but it's lower than the batteries...So low end shouldn't have been a problem, just the high, as the fluctuating voltage that shows up on the GW monitor screen can go low below 25, usually 25.5, but I did see it today go lower for a moment on discharge, while the high charge can go over 31 if not set to 27v or lower..... sometimes that doesn't work and it will shut off solar charging as well.... but the battery reading on the GW monitor may still be fluctuating up and down... wierd... so stable without the BMS, still testing the GW without the BMS now... nice and normal operation. The other smaller Daly BMS had the same problem if I remember correctly, I mostly bought a bigger one for higher charge potential of solar combined with the alternator charge while driving.... but don't think I need it... so thinking of returning this bigger BMS if allowed... as it seems incompatible... but you say yours' is working fine?

Under/over temps shouldn't be a problem as my system is most likely oversized to start with... a van build out... 3- 310w mono panels on top... 8s 24v 280AH battery setup in 8s-alt style. My problem is just the BMS as Ian said. I think most of the program parameters are 'default'... so higher than needed.... since the firmware update, the program parameters for 19 and 20 change together.... locked... no bulk, then float... just one, changing one, changes the other automatically, which isn't necessarily a problem I've read.... currently I set it higher to 28.2v to see what happens... on 26.9v on GW monitor, and 26.69 on battery itself, which seems to be the pattern, once the charging/discharging stops, it shows ~ the same number. I'm keeping an eye on it, as it seems the voltage goes down a little when the charging stops... or slows. I'm thinking of trying to top balance it and reset the other battery monitor which was always affected by the BMS, so I probably set that wrong in terms of the total AH, but I'll have to reset the negative wire again to do that, currently I'm bypassing the other battery monitor as I check the BMS/GW setup. Currently the GW is set to 28.2v, which is higher than I need.. I see others with the 29 bulk and 27.2 float.... 26.9v is about 96%, right? I think 90% is fine... which is where I'll keep the GW set if this works.... or somewhere inbetween. It seems anything higher towards 100% at 29.2v is for top balancing, no?
.
I just don't know what to do with the BMS if it is not working on this GW... but yours is working? Odd. Do you have the firmware update with US2 lithium battery setting instead of USER?... and thus the locked Program 19/20 as well? The beep is staying off, but the alarm symbol remains on the GW monitor screen. Otherwise, without the Daly BMS, it all seems to be working fine. If I set the Program charge setting low enough, then no surge should be a problem, though I would like the BMS backup... but it isn't working for some reason... and the GW isn't surging/fluctuating with the BMS off... very steady without it..

 

[gdpetti]

GW without BMS charging fine, at 27.1v on GW monitor, 26.68 on battery ISDT meter.

One thing when testing the BMS that I didn't think of is that I have a different battery meter's shunt between the out wire for the BMS to the GW.
Could this be the problem? I think I'll test it later if the current charge goes up to top balance... was set at 28.2... thinking of setting 29v on the GW as it's charging nice and slow as the clouds come and go... I didn't think of the shunt before. Can't remember, but I think I did check the negative wire out of the battery to the shunt before with the same results... have to see if I wrote that down.