Charge Efficiency Factor; Current Threshold; Time-To-Go Averaging Period; Battery Starts Synchronised - Progress Solar/Wind SLT 700 Series Operator's Manual

Setting
Peukert exponent (setting 05)

7.2.7. Charge efficiency factor

The "Charge Efficiency Factor" compensates for the capacity (Ah) losses during charging. A setting of 100% means that there are
no losses.
A charge efficiency of 95% means that 10Ah must be transferred to the battery to get 9.5Ah actually stored in the battery. The
charge efficiency of a battery depends on battery type, age and usage. The battery monitor takes this phenomenon into account
with the charge efficiency factor.
The charge efficiency of a lead acid battery is almost 100% as long as no gas generation takes place. Gassing means that
part of the charge current is not transformed into chemical energy, which is stored in the plates of the battery, but is used to
decompose water into oxygen and hydrogen gas (highly explosive!). The energy stored in the plates can be retrieved during
the next discharge, whereas the energy used to decompose water is lost. Gassing can easily be observed in flooded batteries.
Please note that the 'oxygen only' end of the charge phase of sealed (VRLA) gel and AGM batteries also results in a reduced
charge efficiency.
Setting
Charge efficiency factor (setting 06)

7.2.8. Current threshold

When the current measured falls below the "Current threshold" parameter it will be considered zero. The "Current threshold" is
used to cancel out very small currents that can negatively affect the long-term state of charge readout in noisy environments. For
example, if the actual long-term current is 0.0A and, due to injected noise or small offsets, the battery monitor measures 0.05A
the battery monitor might, in the long term, incorrectly indicate that the battery is empty or will need to be recharged. When the
current threshold in this example is set to 0.1A, the battery monitor calculates with 0.0A so that errors are eliminated.
A value of 0.0A disables this function.
Setting
Current threshold (setting 07)

7.2.9. Time-to-go averaging period

The time-to-go averaging period specifies the time window (in minutes) that the moving averaging filter works. A value of 0
(zero) disables the filter and gives an instantaneous (real-time) readout. However, the displayed "Time remaining" value may
fluctuate heavily. Selecting the longest time, 12 minutes, will ensure that only long-term load fluctuations are included in the "Time
remaining" calculations.
Setting
Time-to-go averaging period (setting 08)

7.2.10. Battery starts synchronised

Note that if the battery monitor settings are accessed via the head unit, this setting will be part of the miscellaneous setting, and if
accessed via VictronConnect it will be part of the battery settings.
The battery state of charge will become 100% after the battery monitor is powered up. When set to ON, the battery monitor
will consider itself synchronised when powered up, resulting in a state of charge of 100%. If set to OFF, the battery monitor will
consider it unsynchronised when powered up, resulting in a state of charge that is unknown until the first actual synchronisation.
Please be aware that situations can occur where special consideration is needed when setting this feature to ON. One of these
situations occurs in systems where the battery is often disconnected from the battery monitor, for example on a boat. If you
leave the boat and disconnect the DC system via the main DC breaker and at that moment the batteries were, for example, 75%
charged. On return to the boat, the DC system is reconnected and the battery monitor will now indicate 100%. This will give a
false impression that the batteries are full, while in reality they are partially discharged.
There are two ways of solving this, one is to not disconnect the battery monitor when the batteries are partially discharged or
alternatively turn the "Battery starts synchronised" feature off. Now when the battery monitor is reconnected the state of charge
will display "---" and will not show 100% until the batteries have been fully charged. Please note that leaving a lead acid battery in
a partially discharged state for a length of time will cause battery damage.
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Manual - BMV-712 Smart
Default
1.25
Default setting
95%
Default
0.10A
Default
3 minutes 0 - 12 minutes
Range Step size
1.00 - 1.50 0.01
Range Step size
50 - 100% 1%
Range Step size
0.00 - 2.00A 0.01A
Range Step size
1 minute
All features and settings