Reverse Battery Polarity - Victron energy BlueSolar MPPT 150/35 Manual

• Open (or faulty) circuit breaker in the battery supply cable.
• Incorrectly wired battery cables.
Battery voltage check
Use the VictronConnect app, a connected display or a GX device to read the solar charger battery voltage.
Alternatively, use a multimeter to measure the battery voltage at the terminals of the solar charger.
Step 1
Use a multimeter to measure the voltage at the battery terminals.
Step 2
Step 3 Compare the two voltages.
In case of a voltage difference, investigate the reason behind it by tracing the path from the solar charger to the
battery to identify the cause.
• Check and confirm that all cabling is accurately connected and that there are no wiring errors.
• Inspect the cable connections for tightness while keeping the maximum torque levels in mind.
Step 4
• Verify the correct crimping of all cable lugs or terminals.
• Check the fuses and circuit breakers.
Should you come across a blown fuse, make sure to check the correct wiring of the battery
polarity before replacing it. Refer to the

8.5.3. Reverse battery polarity

Reverse polarity occurs when the positive and negative battery cables are accidentally swapped. This means the negative battery
terminal connects to the positive solar charger terminal, and the positive battery terminal connects to the negative solar charger
terminal.
Be aware that a red or positively labelled cable may not necessarily indicate the cable is positive. A wiring or
labelling mistake during the solar charger installation is possible.
Always double-check the battery polarity before reconnecting the battery wires to the solar charger.
Page 45
MPPT solar charger manual
Examples of correct and incorrect (reverse) battery polarity.
Reverse battery polarity [45] chapter.
Troubleshooting