Victron energy SmartSolar MPPT 100/30 Manual page 25

Float voltage
This setting sets the float voltage.
Re-bulk voltage offset
This setting sets the re-bulk voltage offset. This offset voltage is used to determine when a charge stage stops and the bulk stage
starts again, i.e. the charge cycle resets and starts at the first charge stage again.
The re-bulk voltage is calculated by adding the re-bulk voltage offset to the lowest voltage setting (normally this is the float stage).
An example: If the re-bulk offset is set at 0.1V and the float voltage at 13.8V, the charge cycle will restart once the battery voltage
drops below 13.7V (13.8 minus 0.1) for one minute.
Equalization voltage
This setting set the equalization voltage.
Equalization current percentage
This setting sets the percentage of the "maximum charge current" setting that will be used to calculate the equalization charge
current.
For example: If the "maximum charge current" setting is set at 10A and the "Equalization current percentage" setting is set to
10%, the Equalization current will be 1A (10% of 10A).
Automatic equalization
This setting sets the repeat interval when the equalization stage should take place. This can be set between 1 and 250 days.
Setting to 1 means a daily equalization, 2 means every other day and so on.
An equalization stage is typically used to balance the cells and also to prevent stratification of the electrolyte in flooded lead-acid
batteries. If equalization is needed or not depends on the type of battery if (automatic) equalization is needed and under what
conditions. Check with the battery supplier to find out if equalization is needed for the battery.
During the equalization stage, the charge voltage increases up to the set "Equalization voltage". This is maintained as long as the
charge current stays below the "equalization current percentage" setting of the "Maximum current" setting.
Duration of the Automatic equalization cycle:
• For all VRLA battery presets and for some flooded battery presets, the automatic equalization stage ends when the voltage limit
(maxV) has been reached.
• For the lithium battery preset, equalization is not available.
• When an automatic equalization stage has not been completed within one day, it will not resume the next day. The next
equalization surge will take place according to the interval as set in the "Auto Equalization" setting.
Equalisation stop mode
This setting determines when the equalisation stage should end:
• Automatic: Equalization stops if the battery voltage has reached the equalisation voltage.
• Fixed time: Equalization stops when the time has reached the time as set in the "Maximum equalization duration" setting.
Maximum equalization duration
This setting sets the maximum time that the equalization stage will last.
Manual equalization
Use this to perform a "once-off" equalization. Once the "start now" button is pressed, a one-hour equalization cycle will be
performed, alternatively, the equalization stage can be stopped manually.
Tail current
This setting sets the current threshold to end the absorption stage before the maximum absorption time has been reached. If the
charge current drops below the set tail current, for one minute, the absorption stage will end and the float stage will start. This
setting can be disabled by setting it to zero.
Temperature compensation
This setting sets the temperature compensation coefficient that is needed for temperature compensated charging.
Many battery types require a lower charge voltage in warm operating conditions and a higher charge voltage in cold operating
conditions. The configured coefficient is in mV per degree Celsius for the whole battery bank, not per cell. The base temperature
for the compensation is 25°C (77°F).
The chart below indicates the absorption and float charge voltage behaviour at different temperatures. The graph displays the
temperature compensation for a 12V system and uses a -16mV/°C temperature compensation coefficient. For a 24V system
multiply the voltages by 2.
Page 21
MPPT solar charger manual
Configuration and settings