Victron energy BMV-600S Manuel page 10

4. Connect the shunt to both the positive and negative of the
battery as described in the installation guide, but do not connect
anything to the load side of the shunt.
5. Issue the zero command (see chapter 2.5).
6. Disconnect the negative battery connection from the shunt.
7. Connect the load to the shunt.
8. Reconnect the battery negative to the shunt.
2.3 Background information
When your BMV is installed it is time to adjust the battery monitor to
your battery system. But before discussing the functions in the setup
menu, four important items must be explained first. It is important that
as a user of the BMV you have some insight into these four items. The
actual setup menu functions are explained in chapter 2.5 - Function
overview.
2.3.1 Charge Efficiency Factor (CEF)
The amount of Ah extracted from the battery during discharge does not
equal the amount of Ah needed to recharge it to the same level. Part of
the Ah is not stored chemically but lost by for example gassing. The
ratio between these two is called the Charge-Efficiency-Factor (CEF).
A charge efficiency of 90 % means that 10 Ah must be transferred to
the battery to get 9 Ah actually stored in the battery. The charge
efficiency of a battery depends on the battery type, age and usage.
2.3.2 Peukert's exponent
As mentioned in chapter 1.3, the Peukert efficiency describes how,
when you discharge a battery faster than the 20 h rating, its Ah
capacity decreases. The amount of battery capacity reduction is called
the 'Peukert exponent' and can be adjusted from 1.00 to 1.50. The
higher the Peukert exponent the faster the battery size shrinks with
increasing discharge rate. An ideal (theoretical) battery has a Peukert
Exponent of 1.00 and has a fixed capacity; regardless of the size of the
discharge current. Of course such batteries do not exist, and a setting
of 1.00 in the BMV is only implemented to bypass Peukert
compensation. The default setting for the Peukert exponent is 1.25,
and is an acceptable average value for most lead acid type of
batteries. However for precise battery monitoring, entering the right
Peukert exponent is essential.
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