It’s common knowledge that you dont leave LifePo4 batteries at 100% for long term storage, 40-50% is ideal.
I would like Victron to let us know how to lower the voltage so that I can leave my boat for 6 months each year with the Mutiplus and MPPT’s maintaining the batteries at a given SOC. This is probably easier to set a voltage for this.
Found this new setting that gets close but Victron states dont use it.
"Using the “Limit managed battery charge voltage” DVCC feature on a for long-term storage of Victron Smart batteries Victron GX Device is generally not recommended . This setting is designed solely to temporarily help in the initial cell balancing of certain third-party batteries (like Pylontech).
Would also like to be able to monitor system via VRM portal when system in this lower power state.
Currently I have too discharge to 50% SOC and turn BMS off shut it’s relay off to disconnect batteries for storage.
I have an all Victron 24V system consisting of Ekrano, Lynx 500 BMS, 24V Smart Batteries, (2)24/5000/120 Mutiplus and a MPPT 150/45.
Set your float a lot lower, then re-absorption times much further apart?
Seems like though storage means exactly that. leave totally disconnected and off. If you are wanting to avoid unnecessary cycling this is the way
Pylontec actually recommend charging to 90% then disconnecting and switching off. Recharge in 6 months if they are not intending to be used and left in storage.
“Set your float a lot lower”, that is exactly what I would like to do.
On ekrano gx “settings->system setup->charge Control->limit managed battery charge voltage” default is currently 55V, going to reduce it to 26.4V, 3.3V/cell, which should put me around 70% SOC.
The issue here is that this system is on a boat where when I store the boat in the water for the winter I need to have the batteries enabled to run the bilge pumps etc to keep the boat floating. I have solar and shore power from inverters controlled by DVCC but they keep batteries at 27V 100% SOC all the time.
Have REC BMS on the batteries I built for my RV and home, where I can easily set maximum charge voltage.
I went with Lynx 500 BMS and (6)SMART Victron 200ah batteries on boat and I can not find a recommended way to lower float.
You could possibly try to set the charged/ float voltage a little lower on the multiplus settings, but think the solar will override that?
In the last tab on VE Configure, there is a setting to prioritise other energy sources and set the battery float voltage. I have set a few at 26.9volts (instead of 27) and left solar to do the rest. I think 26.0volts is about 30% charged, but havn’t done much more experimenting as yet. not much sun here at the moment.
My system is running DVCC where the BMS controls voltage through the CVL(Charge Voltage Limit) value broadcast over the VE.can bus to all charging devices. The obvious place to have a setting to reduce float voltage would be at the Victron Lynx BMS but there there are no settings available there.
The VE.can from BMS is connected to Ekrano where it passes the CVLvalue from BMS to VE.direct to MPTT and VE.bus to Multiuplus which the Ekrano could change before passing it on as it passes through the device.
Hoping some one has tried "Using the “Limit managed battery charge voltage” DVCC feature on Ekrano to lower float DVCC value.
If you did that, how would you raise CVL again when you want to either put the float voltage back again or do cell balancing/SoC reset at a higher voltage?
Looks to me like you’d have to go in and manually change the setting…
Settings->System Setup->Charge control “Limit managed battery charge voltage” is available via VRM portal or directly from Ekrano touch screen.
I am going to set it to 3.35V/cell (26.8V for 24V bank) for a test that should be around 90% SOC.
The default value in system is currently 55V which when I set it back to this value should run a balance cycle at 28.4V.
Am not too worried about running a balance cycle every time I run down cells as Victron does.
I have built (4)battery banks now for my house with (48)Eve 304 Ah cells in each and run have run for years now at 60-80% charge and cells have kept to with in 20 mv when taken back to 100% charge every few months.