question

love2learn avatar image
love2learn asked

Syncing Multiplus and Shunt SOC

My Victron shunt and Multiplus are showing 2 different SOC readings. The shunt is showing 100% but the 24/3000/70 is showing anywhere from 70-80% SOC. I have programmed the shunt to know that the battery bank has 412aH @ 24v nominal.


How do I know which reading is accurate, or if either of them even are correct at all?

MultiPlus Quattro Inverter Chargerbattery chargingSmartShuntbattery capacity
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

1 Answer
Stefanie (Victron Energy Staff) avatar image
Stefanie (Victron Energy Staff) answered ·

@Love2Learn,

is there any specific reason why you have the MultiPlus battery monitor activated when you also have a BMV/SmartShunt? There should only be one battery monitor in the system.

The shunt is the the one to trust while the MultiPlus internal battery monitor relies on calculated data.

6 comments
2 |3000

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

love2learn avatar image love2learn commented ·
I thought I had the battery monitor turned off. I'll go in and double check.


That being said, how do I make the SOC reading accurate with the shunt? I'll be charging from solar at 20 amps while the SoC reads 100%

0 Likes 0 ·
Stefanie (Victron Energy Staff) avatar image Stefanie (Victron Energy Staff) ♦♦ love2learn commented ·

Please post screenshots of your shunt settings and also battery settings from your MPPT.

0 Likes 0 ·
love2learn avatar image love2learn Stefanie (Victron Energy Staff) ♦♦ commented ·

Batteries:

4x SOK 206Ah 12v

2 Series, 2 Parallel, for 412Ah @ 24v configuration


Victron MPPT (100/50):

Battery Voltage: 24v

Max Charge Current: 50a

Charger: Enabled

Battery Preset: User Defined

Expert Mode: ON

Absorption Voltage: 29.2v

Float Voltage: 27.6v

Equalization Voltage: 29.2v

Rebulk Voltage Offset: 0.80v

Absorption Duration: Fixed

Absorption Time: 15 Minutes

Tail Current: Disabled

Equalize Current: 0%

Automatic Equalization: Disabled

Equalize Stop Mode: Automatic (On voltage)

Maximum Equalize duration: 0 Minutes

Manual equalization: DO NOT CLICK START

Temperature Compensation: Disabled

Low Temperature Cutoff: Disabled


Victron Multiplus 24/3000/70 Inverter:

Charge Current: 50a

Absorption Voltage: 29.2v

Float Voltage: 27.6v

Equalization: DISABLED


Victron SmartShunt:

Battery Capacity: 412Ah

Charged Voltage: 27.6v

Discharge Floor: 10%

Tail Current: 2.00%

Charged Detection Time: 3m

Peukert Exponent: 1.05

Charge Efficiency Factor: 98%

Current Threshold: 0.10a

Time-to-go averaging Period: 3m

Battery Starts Synchronized: Disabled

0 Likes 0 ·
Show more comments