Victron energy BlueSolar MPPT 150/35, Manual

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3.7 Battery charging information
The charge controller starts a new charge cycle every morning,
when the sun starts shining.
Lead-acid batteries: default method to determine length and
end of absorption
The charging algorithm behaviour of MPPTs differs from AC
connected battery chargers. Please read this section of the
manual carefully to understand MPPT behaviour, and always
follow the recommendations of your battery manufacturer.
By default, the absorption time is determined on idle battery
voltage at the start of each day based on the following table:
Battery voltage Vb
(@start-up)
Multiplier
Maximum
absorption time
Vb < 11,9V x 1 6h
11,9V < Vb < 12,2V x 2/3 4h
12,2V < Vb < 12,6V x 1/3 2h
Vb > 12,6V x 1/6 1h
(12V values, adjust for 24V))
Default absorption voltage: 14,4V
Default float voltage: 13,8V
The absorption time counter starts once switched from bulk to
absorption.
The MPPT Solar Chargers will also end absorption and switch to
float when the battery current drops below a low current threshold
limit, the ‘tail current’.
The default tail current value value is 2A.
The default settings (voltages, absorption time multiplier and tail
current) can be modified with the Victronconnect app via
Bluetooth (VE.Direct Bluetooth Smart dongle needed) or via
VE.Direct.