Battery/Tank Monitor BTM2
REV 1A - FEB 2022 - Software Version 1.xPage 27
The detection of the unavailable capacity is only possible if the battery is discharged up to the first
discharge limit (depending on battery type & load, below approx. battery voltage < 11.5 V).
If the battery is never discharged to this first discharge limit, this detection cannot take place and a
100% intact battery is assumed.
We therefore recommend that this is done once a year at the start of the season to determine the
performance of the battery system.
5.2.3 Residual time calculation
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 expected charging time is displayed until the batteries are charged to approx.
95 %. 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.
5.2.4 Calculating the current state of charge
During charging, the Ah efficiency of the battery (C.E.F.) is automatically taken into account in the
capacity calculation. In doing so, the charging current is evaluated with the C.E.F. value (in %).
6. tips and tricks
a)
If the message "not synchronised" does not go out despite 100% full charge (U > 14.0V
and I < 2% of the nominal capacity) of the battery, this can be achieved manually by
changing the nominal battery capacity by 1 Ah.
Please check that each charging source is correctly recognised. Charging currents are
always positive if all consumers are switched off at the same time.
b)
Battery full detection does not work. Please check the charging voltage of your battery
charger / solar system and set the battery type to WET to work with the lowest possible
values.
Please check whether each charging source is detected with the correct current, charging
currents are always positive if all consumers are switched off at the same time. This must
be checked individually for each charging source. Only the shunt with the B- connection
may be connected to the negative pole of the battery, nothing else!
Software update
A micro SD card is required to update the software of the battery tank monitor. After receiving the
software, the file must be copied to the previously empty micro SD card (FAT32) (without folder,
top level).
To update, insert the SD card into the SD card slot on the back of the monitor and disconnect the
power supply from the battery monitor. The power supply is then switched on and the screen
shows that new software has been detected and is being installed automatically. During the
