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• 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.
9.3.5. Temperature difference between solar charger and battery
It is important that the ambient temperatures of the battery and the controller are equal if the solar charger is not receiving battery
temperature data.
This chapter does not apply if the solar charger is connected to a VE.Smart Network with a battery
temperature measurement or is equipped with a temperature sensor.
The solar charger will measure ambient temperature at the beginning of the day, as soon as power is generated by the solar
array.
It will temperature compensate the charge voltage according to this temperature measurement.
Once the solar charger goes into the float stage it will measure the ambient temperature again and will use that measurement to
adjust the voltages again.
If there are large ambient temperature difference between solar charger and battery, the battery will be charged at the wrong
voltages.
An example of this is if the solar charger is located near a window in the sun, and the batteries are located on a cold concrete
floor in the shade.
Always make sure that the ambient conditions are equal for both the solar charger and the battery.
9.3.6. Insufficient solar
Check if the solar charger reaches the float charge stage each day.
Page 47
MPPT solar charger manual
Wiring unlimited book
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