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Soc when bulk finished Ve configure victron setting

kpw

New Member
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May 7, 2021
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61
Hi yall, When using the victron ve configure it has a setting for "soc bulk finished percentage" default value was set at 95% I felt that was way to high. any advice appreciated.

*280 amp eve 12v battery
 
First, do you NEED this feature enabled? In many cases, you don't, and if you can get by without it, it can avoid some issues, and there are some instances where you don't want to use it at all because it won't work correctly.

Can you summarize your system config and indicate why you want to use that feature?
 
thanks for the reply,

system is a victron multiplus II 12v/3000 with a 4s 280a eve diy battery.

I figured I might as well use the the feature since it is offered. what issues can having it enabled cause?

do I need a victron shunt to use this feature or is the monitoring device built into the inverter already?
 
system is a victron multiplus II 12v/3000 with a 4s 280a eve diy battery.

I figured I might as well use the the feature since it is offered. what issues can having it enabled cause?

It depends on your system. In some cases, erroneous SoC based trigger events. In others, nothing.

do I need a victron shunt to use this feature or is the monitoring device built into the inverter already?

No. The shunt would render the built-in battery monitor useless, as the shunt is more capable.

Do you plan to charge in any other way besides AC charging with the inverter?
Do you plan to have a Cerbo or other GX device in the system?
 
yes I also charge with a victron mppt 30 amp cc no- communication to inverter.
no plans for a cerbo or gx device.
 
what I do also like about the battery monitor feature is it allows a low soc inverter shut down . when selected in the programing page one must fill in a soc bulk finished percentage to use any of the features I belive.
 
yes I also charge with a victron mppt 30 amp cc no- communication to inverter.
no plans for a cerbo or gx device.

The MP battery monitor function is worthless to you. You should not enable it. It can only see what passes through the inverter. Since the MPPT charge current does not pass through the inverter (impossible to do so), the battery monitor can't see that, so your SoC will always be wrong.

If you install a GX device, the GX device can feed MPPT charge information to the MP battery monitor and improve its accuracy.

If you want a battery monitor to properly report SoC, you either need a smartshunt with the MP battery monitor disabled, or a GX device.

Since I only use VRM for monitoring, I'm trying to think of where you would actually SEE the MP reported battery monitor. Besides VRM, the only way I can think to get that info is connecting directly with a MK3-USB adapter (PC/MAC VictronConnect) or the VE.Bus smart dongle (MAC, smartphone via bluetooth, but NOT a PC).
 
what I do also like about the battery monitor feature is it allows a low soc inverter shut down . when selected in the programing page one must fill in a soc bulk finished percentage to use any of the features I belive.

The SoC will only go down (except with AC charging)... not up as it can't see the MPPT current incoming, so it will shut down even when the battery is full/nearly full.
 
BUT!!!!

If you are charging to 14.4V-ish, 95% is a good number. They're pretty much poked near full.

also recommend you use the T-sense for a second layer of low temp protection and the V-sense leads for more accurate voltage sensing.
 
Ok got it!

hypothetically, what would a general % be for a end of bulk soc for Lifepo4 cells?
 
What about the VE blutetooth dongle and VEsmart network?

Wouldn’t that have the MP talking to the smart shunt for SoC?

Or is the MP only able to see that via Cerbo?
 
What about the VE blutetooth dongle and VEsmart network?

Nope. VE.Bus smart dongle could share MP voltage and temperate data to other VE.Smart connected devices.

Wouldn’t that have the MP talking to the smart shunt for SoC?

Or is the MP only able to see that via Cerbo?

This.

Cerbo + MPPT + MP: the MP battery monitor would be reasonably accurate as the Cerbo would tell the MP about the current produced by the MPPT, and it would subtract its own draw from the inverter to establish the net flow to the battery and calculate SoC.

IMHO, I doubt it's as good as a smartshunt.
 
So smart shunt + smart MPPT + smart dongle all on the same VEsmart network won’t share SoC to the MPPT?

I mean the shunt rules all for what goes in and out of the battery and the MPPT bases its charging off the smart shunt voltage/SOC settings.
 
So smart shunt + smart MPPT + smart dongle all on the same VEsmart network won’t share SoC to the MPPT?

Sorry. the OP doesn't have a smart shunt, and I missed that detail in your post.

The smart dongle will have no voltage input into the VE.Smart network due to the presence of the smarshunt, but may provide temperature data if the smartshunt doesn't have a temp sensor.

I mean the shunt rules all for what goes in and out of the battery and the MPPT bases its charging off the smart shunt voltage/SOC settings.

The MPPT in no way uses SoC in it's charging. It will use the shunt provided voltage and battery current value to establish absorption voltage and tail current if so configured. It will use any available temp data for lead acid temp comp or LFP low temp protection.
 
Sorry. the OP doesn't have a smart shunt, and I missed that detail in your post.

The smart dongle will have no voltage input into the VE.Smart network due to the presence of the smarshunt, but may provide temperature data if the smartshunt doesn't have a temp sensor.



The MPPT in no way uses SoC in it's charging. It will use the shunt provided voltage and battery current value to establish absorption voltage and tail current if so configured. It will use any available temp data for lead acid temp comp or LFP low temp protection.
I thought the smart dongle does have a voltage input into smart network (just like temp) as it has a voltage sense lead just like the shunt, I think the shunt voltage is just considered the master.
 
I thought the smart dongle does have a voltage input into smart network (just like temp) as it has a voltage sense lead just like the shunt, I think the shunt voltage is just considered the master.

I thought that's what I said... :P

Yes, the smart dongle can provide voltage/temp data to other VE.Smart devices.

This portion of the manual partially describes the selection order:

 

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