Victron VE.Bus Configuration Guide

Re-bulk voltage The Re-bulk voltage is the point that the charger returns to the bulk charging stage. It depends upon the float
voltage. Lithium batteries tend to have a more stable voltage output and a narrower voltage range than lead acid batteries, so in
lithium mode the value between float and re-bulking is reduced.
Required setting per lithium type
A) Batteries with built-in BMS
Batteries with built-in BMS, including charge and discharge interruptors, such as the Victron Superpack, Battleborn or Simplify
battery brands. Also known as 'drop-in replacement' type batteries. For these types, enable the lithium battery mode; and set the
charging voltages as per the battery manual. There is no need for Assistants or other configuration.
B) Victron V12.8 and 25.6V batteries, requiring a VE.Bus BMS
These require additional configuration that is not currently supported by VictronConnect. Please use VEConfigure instead and
install the VE.Bus BMS Assistant, as well as check the Lithium battery checkbox.
C) Intelligent batteries, connected to a GX-device with DVCC enabled:
Checking or not checking the box doesn’t matter; it has no effect. In systems with such a battery, all charger settings are
overridden by parameters coming from the CAN-bus.
Examples are Victron 24V Lithiums with a Lynx BMS, BYD, Pylontech, MG Electronics, Freedomwon, Redflow, and others.
10.4.11. Storage mode
With this feature active, after 24 hours in float charge, the charging voltage will be reduced below the float voltage to provide
optimum protection of the battery against overcharging; charging current will continue to be applied regularly to compensate for
self-discharge. This is the rest voltage if the battery is fully charged.#
10.4.12. Use equalisation
For optimum charging, special traction batteries require a fixed charging current phase in addition to a voltage curve. Beware that
this often results in a higher charging voltage that can be damaging to DC loads!
10.4.13. Weak AC input
If the quality of the supply waveform is less than the charger expects, it will reduce its output to ensure that the COS phi
(difference between current/voltage phases) remains acceptable. This protection can be deactivated for low capacity or poorly
regulated power supplies.
10.4.14. Stop after excessive bulk
If the absorption voltage has not been reached after 10 hours, the battery may be faulty and the charger will switch off for safety
reasons. This setting will trigger the lithium battery options and wizard, depending on the configuration of your lithium battery and
manufacturers advice you may need to adjust additional settings as well.
10.5. AC Input Control
The AC Input Control can be set up in numerous ways, for example, the Multi will disconnect from the grid when the batteries are
full enough and/or the AC load is not too big. The Multi will disconnect from the grid most of the time. It will only let the grid in
when the batteries are empty or when you are running a big AC load. You now can use the grid like you would use a backup
generator.
The mechanism behind the AC Input Control is the opening or closing the Multi’s internal AC input relay.
This feature in not enabled by default.
The normal function of this relay is to open as soon as the grid or generator is not there. For example, during a blackout or when
a generator is off. This is a safety action. The relay prevents energy feeding into the grid during a blackout or when the generator
is off.
This relay can also be setup to purposefully ignore the grid. It will still perform its normal safety action but it can open and
disconnect from the grid under more situations. It can ignore the grid when the batteries are still full enough. Now DC solar power
can be prioritized and the grid will be used like a backup generator
10.5.1. When can the grid be controlled?
The AC input relay can be programmed to selectively ignore the grid, while looking at two parameters: It can look at battery
voltage and/or at AC load parameters.
The grid is ignored when the batteries are full enough. The grid is let in when the batteries are empty:
• This setting can be used to charge the batteries from the grid should the batteries get too empty. This can occur, for example, at
night or during a long period of bad weather.
VictronConnect - VE.Bus Configuration guide
Page 16 Description of Settings