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Victron Lynx Smart BMS 500 Manual

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10.4.2. Incorrect state of charge reading
An incorrect state of charge can be caused by a variety of reasons.
Incorrect battery settings
The following parameter(s) will have an effect on the state of charge calculations if they have been set up incorrectly:
• Battery capacity
Incorrect state of charge due to a synchronisation issue:
The state of charge is a calculated value and will need to be reset (synchronised) every now and then.
The synchronisation process is automatic will be performed each time the battery is fully charged. The battery monitor determines
that battery is fully charged when all 3 "charged" conditions have been met. The "charged" conditions are:
• Charged voltage (Voltage)
• Tail current (% of battery capacity)
• Charge detection time (minutes)
Practical example the conditions that need to be met before a synchronisation will take place:
• The battery voltage has to be above 13.8V
• The charge current has to be less than 0.04 x battery capacity (Ah). For a 200Ah battery this is 0.04 x 200 = 8A
• Both above conditions have to be stable for 3 minutes
If the battery is not fully charged or if the automatic synchronisation does not happen, the state of charge value will start to drift
and will eventually not represent the actual state of charge of the battery.
The following parameter(s) will have an effect on automatic synchronisation if they have been set incorrectly:
• Charged voltage
• Tail current
• Charged detection time
• Not occasionally fully charging the battery
For more information on these parameters see the chapter: "Battery settings".
Incorrect state of charge due to incorrect current reading:
The state of charge is calculated by looking at how much current flows in and out of the battery. If the current reading is incorrect,
the state of charge will also be incorrect. See paragraph Incomplete current reading [32]
10.4.3. State of charge is missing
This means that the battery monitor is in an unsynchronised state. This can occur when the Lynx Smart BMS has just been
installed or after the Lynx Smart BMS has been unpowered for some time and is being powered up again.
To fix this, fully charge the battery. Once the battery is close to a full charge, the battery monitor should synchronise automatically.
If that doesn't work, review the synchronisation settings.
10.4.4. State of charge does not increase fast enough or too fast when charging
This can happen when the battery monitor thinks the battery is bigger or smaller than in reality. Check if the battery capacity has
been set correctly.
10.4.5. Synchronisation issues
If the battery monitor does not synchronise automatically, one possibility could be that the battery never reaches a fully charged
state. Fully charge the battery and see if the state of charge eventually indicates 100%.
10.5. VictronConnect issues
Cannot connect with the VictronConnect App
It is highly unlikely that the Bluetooth interface is faulty. These are some pointers to try before seeking support:
• Is the battery voltage still high enough? If the battery voltage drops to a very low level, the Lynx Smart BMS will eventually turn
its Bluetooth interface off.
• Is there already another phone or tablet connected to the product? Only one phone or tablet can be connected at any given
time. Make sure no other devices are connected and try again.
• Are you close enough to the product? In open space the maximum distance is about 20 meters.
Lynx Smart BMS
Page 33 Troubleshooting and Support
… 36 …


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