Victron energy BMV-600S Manuel page 6

The BMV is now ready for use and the + and – selection keys can be
used to select the desired read-out:
Label Description
Battery voltage: this readout is useful to make a rough estimation of
V
the battery's state-of-charge. A 12 V battery is considered empty when
it cannot maintain a voltage of 10.5 V under load conditions. Excessive
voltage drops for a charged battery when under heavy load can also
indicate that battery capacity is insufficient.
VS** Starter battery voltage (BMV 602S): this readout is useful to make a
rough estimation of the starter battery's state-of-charge.
I Current: this represents the actual current flowing in to or out of the
battery. A discharge current is indicated as a negative value (current
flowing out of the battery). If for example a DC to AC inverter draws 5
A from the battery, it will be displayed as –5.0 A.
CE Consumed Energy: this displays the amount of Ah consumed from
the battery. A fully charged battery sets this readout to 0.0 Ah
(synchronised system). If a current of 12 A is drawn from the battery
for a period of 3hours, this readout will show –36.0 Ah.
SOC State-of-charge: this is the best way to monitor the actual state of the
battery. This readout represents the current amount of energy left in
the battery. A fully charged battery will be indicated by a value of
100.0%. A fully discharged battery will be indicated by a value of 0.0%.
TTG Time-to-go: this is an estimation of how long the battery can support
the present load until it needs recharging.
1.2 Synchronising the BMV
For a reliable readout, the state of charge as displayed by the battery
monitor has to be synchronised regularly with the true state of charge of
the battery. This is accomplished by fully charging the battery. In case of
a 12 V battery, the BMV resets to "fully charged" when the following
"charged parameters" are met: the voltage exceeds 13.2 V and
simultaneously the (tail-) charge current is less than 4.0 % of the total
battery capacity (e.g. 8 A for a 200 Ah battery) during 4 minutes.
The BMV can also be synchronised (i.e. set to "battery fully charged")
manually if required. This can be achieved in normal operating mode by
holding the + and – buttons simultaneously for 3 seconds, or in setup
mode by using the SYNC option (see sect. 3.4.1).
2
Units
V
V
A
Ah
%
h