Energy Mode; Terms And Definitions - Cristec BAT-MON-3.5 Manuel Utilisateur

5.2 E
NERGY MODE
After pressing the circle in Energy mode the energy harvest is graphically displayed over the last 30 days.
So you can see easily how much energy (Ah) the charging source supplied to your battery system.
5.3 T
ERMS AND DEFINITIONS
Nominal (or rated) capacity
To obtain a reasonable accuracy of the remaining time (see section 5.1) as well as the percentage charge display,
the capacity of the battery to be monitored must be set. Please note that the nominal capacity of the battery
should only be adjusted when the batteries are 100% charged : the capacity indicator is set to 100% and all
internal statistics are reset.
Alarm capacity
A message appears on the monitor to charge the battery (battery circle appears orange) when the battery falls
below the set capacity threshold. The alarm capacity alarm is preset to 50 %. For an average application, this
value is usually suitable ; however, the alarm can be set according to the requirements of the application.
Charge efficiency factor (CEF)
Each battery has a
(discharge) and the Amperes hours required (charge) to recover its original state of charge. This means that more
amp hours must be charged into the battery than can be withdrawn. The efficiency of a lead battery is between
80% and 98%. If the CEF deteriorates below 75% during operation, this basically means that the battery has
reached the end of its service life and needs to be replaced. The factory default is 98%. The CEF is automatically
adjusted by battery management averaging over the last 4 cycles.
Cycle depth
The cycle depth indicates by which purcent value (%) a battery must be discharged and charged so that a charge
cycle is counted. For starter batteries should be a value between 10-20% and for GEL batteries can be set
50 %.
Peukert factor (or exponent)
The capacity of lead-acid batteries is usually stated for a 20-hour discharge. This means, for example, that a 100
amp-hour battery can deliver 5 amps for 20 hours before the battery runs out. If the discharge current is higher,
for example 10 amperes, then the battery is unable to supply the full 100 ampere hours. In this case, the battery
voltage drops below the lower limit of 10.8V for 12V batteries before the battery has delivered its rated capacity.
This relationship can be mathematically determined with the Peukert equation. This equation is used to adjust
the remaining time (see section 5.1) at high discharge rates. Under normal circumstances, the Peukert exponent
need not be changed. Usually, for lead batteries, unless different values are available, the Peukert exponent is set
to 1.27, for lithium systems to 1.02.
Remaining time
The remaining time is the time that the main battery can still be used with the current power consumption until
the capacity alarm is reached. During charging, the estimated charging time is displayed until the batteries are
about 95% charged. The maximum value during a discharge process is 99.9 hours (> 4 days). The remaining time is
automatically corrected taking into account the Peukert function.
charge efficiency. The CEF is the ratio between the Ampere hours that are withdrawn
down to
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