Victron energy BlueSolar MPPT 100/30 Manual página 12

2. For CAN-bus Lithium batteries, like BYD, the battery tells the
system, including the solar charger, what charge voltage to
use. This Charge Voltage Limit (CVL) is for some batteries
even dynamic; changes over time; based on for example
maximum cell voltage in the pack and other parameters.
When, in case of the above-mentioned exceptions, several solar
chargers are connected to a GX device, these chargers will
automatically be synchronised.
Variations to expected behaviour
1. Pausing of the absorption time counter
The absorption time counter starts when the configured
absorption voltage is reached and pauses when the output
voltage is below the configured absorption voltage.
An example of when this voltage drop could occur is when PV
power (due to clouds, trees, bridges) is insufficient to charge
the battery and to power the loads.
When the absorption timer is paused, the absorption LED will
flash very slowly.
2. Restarting the charge process
The charging algorithm will reset if charging has stopped (i.e.
the absorption time has paused) for an hour. This may occur
when the PV voltage drops below the battery voltage due to
bad weather, shade or similar.
3. Battery being charged or discharged before solar charging
begins
The automatic absorption time is based on the start-up battery
voltage (see table). This absorption time estimation can be
incorrect if there is an additional charge source (eg alternator)
or load on the batteries.
This is an inherent issue in the default algorithm. However, in
most cases it is still better than a fixed absorption time
regardless of other charge sources or battery state.
It is possible to override the default absorption time algorithm
by setting a fixed absorption time when programming the solar
charge controller. Be aware this can result in overcharging your
batteries. Please see your battery manufacturer for
recommended settings.
4. Absorption time determined by tail current
In some applications it may be preferable to terminate
absorption time based on tail current only. This can be
10