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To investigate look at the history tab in the VictronConnect app. The histogram displays how long the batteries have been charged
in the Bulk, Absorption and Float stage each day, for the last 30 days. If you click on one of the histogram columns you will see a
breakdown of the charge stages.
You can use the charge times to see if the PV array is properly sized for your requirements. A system which never reaches the
float stage could have the following issues:
• Not enough solar panels
• Too much load
• A problem with the array causing it to have a reduced power output.
• For more potential reasons see paragraph: "PV power or yield less than expected"
Please note that above information does not apply to an ESS system. An ESS system will always be in the bulk charge stage
while grid is connected.
System spending all its time in bulk with breakdown of charge stages - System in bulk and absorption
9.3.7. Wrong temperature compensation setting
If the temperature compensation coefficient is set incorrectly, the batteries can be undercharged or be overcharged. The
temperature compensation can be set via VictronConnect or via a display.
To find out the correct temperature compensation coefficient setting for your battery, refer to the battery documentation. When in
doubt use the default value of -64.80mV/°C for lead acid batteries and disable the temperature compensation setting for lithium
batteries.
9.3.8. Battery charge current too low
Check the "Max charge current" setting in the VictronConnect app or via the display.
If the "Max charge current" has been set too low, it will take longer to charge the batteries and/or the batteries will not be fully
charged at the end of day.
9.4. Batteries are overcharged
Batteries that are being overcharged are very dangerous! There is a risk of battery explosion, fire or acid
leakage. Do not smoke, create sparks or have open flames in the same room as where the batteries are
located.
Overcharging batteries will cause battery damage and can be caused by:
• Incorrect charge voltage settings.
• Battery voltage setting too high.
• Applying equalization while the battery is not suitable for equalization.
• High current and undersized batteries.
• Battery faults.
• Too high current, while the battery is not accepting charge anymore because of aging or prior mistreatment.
9.4.1. Battery voltage setting too high
If the "battery voltage" setting in the VictronConnect App has been set to a voltage higher than the actual system voltage, the
battery will be overcharged.
Page 48
MPPT solar charger manual
Troubleshooting and Support
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