Product Manual

Reverse battery polarity can in rare occasions be accompanied with a blown battery fuse (one that is located in the battery cable).
But in most cases the ultra-fast internal fuse inside the solar charger will blow to ensure a proper fail-safe situation. This internal
fuse will usually blow before the external fuse blows. The internal fuse is located in a non-serviceable area of the solar charger. It
is not possible to replace or repair this fuse. This fuse will only blow in case of an internal fault, and replacing the fuse will not fix
the internal fault.
Always verify the battery polarity before reconnecting the battery wires to the solar charger.
9.2.2. Reverse PV polarity
In case of reverse PV voltage, the solar charger will not indicate an error. The only way to tell is by the following signs:
• The controller is not charging the batteries.
• The controller is getting hot.
• The PV voltage is very low or zero Volt.
If this is the case check for reverse polarity by ensuring that the positive PV cable is connected to the positive PV terminal, and
the negative cable is connected to the negative terminal.
9.2.3. Battery full
Once the battery is full the solar charger will stop charging or will greatly reduce the charge current.
This is especially the case when at the same time the DC loads in the system are not consuming any power from the battery.
To find out what the state of charge (SoC) of the battery is, check the battery monitor (if present), or alternatively check what
charge stage the controller is in. Also observe that the solar cycle is (briefly) progressing trough these charge stages at the
beginning of the daily charge cycle:
• Bulk stage: 0-80% SoC
• Absorption stage 80-100% SoC
• Float or storage stage: 100% SoC.
Be aware that it can also be possible that the solar charger thinks the battery is full, while in reality the battery is not full. This can
occur when the charge voltages have been set too low, causing the solar charger to prematurely switch to the absorption or float
stage.
9.2.4. Remote terminal is missing, is disconnected or external control is active
Generally speaking both the remote connector and the wire loop need to be present for the controller to be operational. In some
advanced systems it can be that the remote on/off connector is connected to an external device, a switch, a relay or another type
of external control, like a battery BMS system.
Remote connector with wire loop
There are several ways to activate via remote on/off: Use modes of the system on-off:
• ON when the L and H terminals are interconnected via a switch or a relay contact
• ON when the L terminal is pulled to battery minus (VL< 3.5V)
• ON when the H terminal is high (2.9V<VH<Vbat)
General remote terminal check
1. Check if the connector with the wire loop is present.
2. Check if the connector has been inserted all the way in.
3. Check that the wire loop is making electrical contact.
4. Be aware that if an external device is connected to the remote terminal, the wire loop has been removed and one or two
wires will be connected between the remote connector and the external device.
9.2.5. The charger is disabled
Check the VictronConnect App to make sure the charger has been enabled.
MPPT solar charger manual
Page 41 Troubleshooting and Support