Hi I’ve recently got two new pylontech batteries in my stack taking it upto 6 but now I seem to no longer be able to get to 100% I’m using the Pylontech settings can anyone help? Stayed at 99% for 5 hours until the over night schedule stopped.
Leave it longer then. If they are new they may take a while longer than a few hours.
Are they the in master position in the stack?
Don’t stress too much at 99% if all their individual voltages are correct. I have noticed on some of their firmwares the battery sits at 99% in some systems.
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Hi thanks yes the new ones are the master stack now, though 5 hours is a long time @ 99% no? They seem close cell wise lowest is .319 highest is .321 but that 100% is bugging me is there anything I can do to get this to register 100% now I’m thinking when I get the other two batteries will it decrease even more?
Victron recommends 52V charge, 51V float for Pylontech.
Pylontech says in their docs at least 52.5V…
On my system, I’ve observed that for reaching 100%, I need to set at least 52.2V.
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Not in my experience.
The 99% seems to be a trend i have noticed with mixing older and newer pylon batteries.
With the ve bus set like that, i noticed the battery will request higher and it does charge up to the higher voltage requested.
@Daza did they request a CCL of 0A at any point?
Thanks @alexpescaru and @lxonline I’ve not seen 0 CCL the only way I’ve seen that is in DVCC at the moment it’s 120A I’ve just set it to charge again. Yeah Victron pylontech settings is absorption voltage 52 and float voltage 51.
And @lxonline are you saying the system goes over the float voltage if up’d to 52.2volts?
@lxonline CCL doesn’t seem to move from 120A I’m back to 99% and the min and max cell voltages have moved to .448 lowest highest .493
At @lxonline is this what you’re talking about when saying the CVL increases? But this is still set to the Victron settings of 52volts yes the CCL has started to decrease
What i have seen is variable behaviour in all the pylon banks.
If the battery has requested 0CCL then it has considered itself fully charged.
Yes, the batteries go above the 52v set in the ve bus. But again, i see different behaviours depending on firmware and battery model used (and mixed), @alexpescaru has worked out his own method for what he has installed through his experience.
Justbe aware though that if you are feeding back to grid the set point moves 0.4v above. (So in the case of 52v it becomes 52.4 in the working of the system.
Just check with your system though and watch the behaviour.
I have a custom widget for banks i want to keep an eye on
The information is usually including the following parameters.
System charge voltage set point
Battery CVL
Battery voltage from battery monitor
Ve bus battery voltage
Usually that gives me a good indication of whether it is behaving ok.
Other information to compare is of course the charge current limit with SOC. If your cells are pretty well balanced you have not much to worry about.
That is what i was referring to. The battery requests higher (no you don’t want it that high). You see on your screen shot the CCL is 40A there @Daza
Use the widgets.
@lxonline they are all the standard Victron pylontech settings, just broke the 100% no settings changed. So I thought with the DVCC the pylon BMS does all the levels for Amps and volts and the multiplus settings is just back up?
Yes CCL is now 0.0
Gonna have to try to get to grips with these widgets but I noticed it in home assistant that SOC didn’t get to 100% but now it is in both Victron, pylon and home assistant. Could it be that it just needed a bit more time to balance the packs? What I hope it doesn’t do is go outside my 6 hour window in order to achieve the 100% will have to keep an eye on this for sure but solved for now. Thanks to you both @lxonline @alexpescaru much appreciated
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The not quite getting to 100% is documented in the pylon setup guide. Nothing to worry about. It will come right with time.
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They are happy then.
Probably. They will be different as they are different ages.
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I didn’t envision it would be taking so long though as the calculations show 600Ah would take 4.85hours at 0% state of charge with a 130A charge current which is well within the 10kVA, think when I get the other two batteries I’ll charge them up as a two stack and then the old stack and then add them all and charge again, thank you @lxonline @alexpescaru @nickdb
No need for such complication - charging separately.
Just put them with the pack, daisy chain the communication and the master battery will take care or everything.
It will average the SOC up until they are all 100%.
Even the charged ones will contribute to the charging of the discharged ones - no other choice here, Kirchhoff’s laws.
This is how I’ve done, starting with 4 and, through time, now I have 8 (2.4kW and 4.8kW mixed up) and all are working perfectly in sync.
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Ok great as the overall system configuration is going to be 8 US5000 so your config shows it works in the field so that’s great fo me and good that I don’t have to that song and dance with packs lol
Just another voice to the “99% is fine” choir. I have two older US5000 and a much newer one added about 3 months ago. I rarely get to 100% now, it always sits at 99%.
The older batteries are SoH 96%, the new one is SoH 100%, which I figured is the issue.
@ZStation_UK cheers I seem to be hitting 100% again the winter will be the test as I’ve got a lot of capacity now so got a higher SOC that I’m going into the night with at the moment. All batteries are wired in parallel so hopefully easier for them to balance and stay balanced.
My SOH with the old batteries was 97% the additional two has put it at 98% SOH so all good just wish there was an easy way to tell what batteries are US5000-1C’s with the barcodes.
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