Hello everyone, can someone explain the charging curve shown to me?
I’m not quite sure why there is a 50% deviation in the display.
Battery status: min 23% max. 68% Average: 46%
The storage capacity is 40 kWh…
I couldn’t find a suitable explanation in the search function.
Best regards and thanks in advance,
Peter
The dash shows the lowest and highest SOC was during the hour and calculates the average during the window.
Thank you for your reply, nickdb, but I have another question.
After 10 p.m. (22:00), I have almost no consumption. What is the reason for the load deviation of min Soc: 21% and max Soc: 68% (47%)?
I could understand a fluctuation of ±5%, but 47%???
Many thanks in advance and best regards
Peter
You need to look at the source of the SOC for answers, VRM just reports what it is sent.
If you have a BMS then it may be inaccurate, a shunt may be misconfigured or incorrectly installed.
The internal monitor of the multis is also not very accurate and estimates some usage.
Your battery voltage is dropping off a lot, that may be contributing.
Also, check you have the right monitor configured in the GX system settings and DVCC, if you’re using it.
The settings are looking fine for me.
Battery system 4x Packs with 15 LiFePo4 (max. Load Voltage 3,45V per Cell) Pace BMS.
Max. load current per pack 4x50A=200A
Am I missing something?
Regards
Peter
What is the monitor in settings system setup? It should also be set to the BMS.
The Pace BMS is famously terrible for big jumps in SOC, it’s one of the reasons I stopped using them.
If all settings are fine then your BMS appears to be the problem.
It is set to “Automatic.”
I will now try to set the settings fix to BMS.
I will let you know tomorrow if it works!
Best regards
Peter
The SOC chart you posted from VRM advanced is direct from the BMS, and the deviation is shown there, so this does appear to be a BMS issue.
Okay, i get it.
What kind of BMS would you prefer for Victron? JK BMS?
A supported one ideally, JK is unsupported but known to be compatible, though there seem to be endless topics about problems with them.
Some use Daly. Others JK.
I myself switched from Daly to JK after 8 failures. Was getting a little too expensive. Yes. You may receive a free BMS from Daly, but if your batteries are over(dis)charged….you will still have to replace them from your own wallet.
Attached the relult from today!
It looks further strange to me! Hm..
The Shunt diagram looks good to me.
I have to think about a new BMS!
With some BMS’s having pretty poor SOC calculations (the DIY ones often the worst) people have resorted to shunts instead. You lose management, but management with a hopeless SOC isn’t worth all that much.
How you configure a BMS does matter, but if it can’t accurately measure what’s going on in the battery, it will never work properly.
Have a look at Orion as well, it is pretty decent.
No BMS is perfect, just some are less imperfect than others.
The battery system is not a DIY product, and UFO told me that it should be fully compatible with Victron.
But it is what it is. If you buy cheap, you buy twice!
Regards Peter
Well aware, just commenting that this is more common with DIY batteries.
Pace is a common generic choice for many cost-effective batteries, even some supported by Victron (BSL, Hubble etc).
It is used because it offers quick and easy integrations into popular inverters, but it has issues which are seen across these different brands to varying degrees.
How it behaves can also vary on how you use it, so it may work fine in one application, or rather go unnoticed, but in another it has issues.
