SOC - Smart Shunt or Lynx Shunt?

[ESSGobel]

Hi,

looking for a good SOC calculation of my 4 batterie packs.
Actually the Gobels are calculating the SOC and this is not working fine.
What would be the best change?

actual situation:

change:

I have seen a description of the smart shunt build in DIY into a Lynx.

[OGPS (Ed @ Off-Grid Power Systems - offgridps.com)]

Unfortunately, that’s what you get with cheap BMS’s. Even my PB series JK-BMS’s are crap. I would suggest two different paths for you to consider:

1. Use a SmartShunt and not a Lynx Shunt. The Lynx Shunt is terribly inaccurate along with its other deficiencies. Disable DVCC and set the SmartShunt as your battery monitor. Manually set your charger settings in all your chargers. Easy peasy and relatively inexpensive.
2. Get an iBMS that works with the BMS in those Gobel batteries along with a SmartShunt connection kit for the iBMS and a SmartShunt. You will retain closed-loop communications, have a good BMS, and reliable SoC tracking. It costs more but gives you all the features you hoped for with those Gobel batteries.

You can find the iBMS products here: https://shop.jamestronics.com

[kr0815]

Are you sure they are inacurate?

I have 2 Daly BMS here, also thought i have to improve measurement, bought a smartshunt

I had to realize there is only a SOC difference between Daly and Smartshunt of 1-2%

[ESSGobel]

I have 2 charges of Gobel Batteries, two orders. The old one shows during a full cycle up to 4% SOC difference per day!
Tried to adjust but it is and stays inaccurant.
Now in winter I see the problem, would like to have 20% reserve for grid failure, do not even know how much SOC is left inside the batteries.

OK, smart shunt. There are different, I have 4 packs with each 150A load, 250A discharge (I reduced that but it is capable to handle that).
Is there any other difference on ip21 and ip65 further then water resistence?

found that, I think I will do that, but the bended bars keep me holding back:

Smart Shunt im Victron Lynx System

[ESSGobel]

this would be my actual thinking of:

changes are:

• 1000A Smart Shunt IP21
• Fuses inside Lynx on battery side
• Switches on Plus Side to battery

what do I get out of it?

• real SOC inside Victron system
• accurate voltage measurement
• better fused on battery side
• easier demount of battery packs

Option the iBMS, but do not know now anything about the benefits and how many neaded and costs.

[ESSGobel]

next:

[ESSGobel]

what about the size of the smart shunt, 500A seams to be small on a 1000A busbar and my Gobel packs are capeable of 800A.
but 3x MP2 5k can only do 210A, if both ESS are fully discharging it will be 420A, but what about peaks ?
is a 500A Smart Shunt good enough ? maybe once in my lifetime during a fault or something they will pull max and peak out ??

[ESSGobel]

das ist jetzt mein Plan:

3x Lynx Power In M8
1x DIY Lynx Smart Shunt 1000A
4x Adler EF3 250A Sicherungen
4x Batterietrennschalter 48V 275A

[ESSGobel]

Can anyone tell me anything about battery disconnect switches? Are they really good? Or are they a problem in the long run?