Victron energy SmartSolar MPPT 75/10 Anleitung Seite 11

2. Restarting the charge process
The charging algorithm will reset if charging has stopped 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 achieved by increasing the default absorption time
multiplier.
(warning: the tail current of lead-acid batteries does not decrease to zero when the
batteries are fully charged, and this "remaining" tail current can increase substantially
when the batteries age)
Default setting, LiFePO4 batteries
LiFePO4 batteries do not need to be fully charged to prevent premature failure.
The default absorption voltage setting is 14,2V (28,4V).
And the default absorption time setting is 2 hours.
Default float setting: 13,2V (26,4V).
These settings are adjustable.
Reset of the charge algorithm:
The default setting for restarting the charge cycle is Vbatt < (Vfloat – 0,4V) for lead-acid,
and Vbatt < (Vfloat – 0,1V) for LiFePO4 batteries, during 1 minute.
(values for 12V batteries, multiply by two for 24V)
3.9 Automatic equalization
Automatic equalization is default set to 'OFF'. With the Victron Connect app (see sect 1.9)
this setting can be configured with a number between 1 (every day) and 250 (once every
250 days).
When automatic equalization is active, the absorption charge will be followed by a voltage
limited constant current period. The current is limited to 8% or 25% of the bulk current. The
bulk current is the rated charger current unless a lower maximum current setting has been
chosen.
When using a setting with 8% current limit, automatic equalization ends when the voltage
limit has been reached, or after 1 hour, whichever comes first.
Other settings: automatic equalization ends after 4 hours.
When automatic equalization is not completely finished within one day, it will not resume the
next day, the next equalization session will take place as determined by the day interval.
3.10 VE.Direct communication port
See section 1.10 and 3.5.
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