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The voltage drop is caused by the following:
• Battery cables with insufficient cross-sectional area
• Badly crimped cable lugs or terminals
• Loose terminal connections
• Bad or loose fuse(s)
For more information on cabling issues and voltage drop see the
Battery cable voltage drop check
This check can only be performed if the solar charger is in the bulk charge stage and is charging with full current.
1.
Measure the voltage on the battery terminals of the solar charger using the VictronConnect app or a multi meter.
2.
Measure the battery voltage on the terminals of the battery using a multi meter.
3.
Compare the two voltages to see if there is a voltage difference.
5.4.7. 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.
5.5. 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.
5.5.1. Battery charge voltages too high
If the battery charge voltages are set too high this will cause the batteries to overcharge.
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Troubleshooting Guide - MPPT
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