9.5.7. MC4 connectors wrongly connected
For a detailed explanation on how to connect MC4 connectors, MC4 splitters and MC4 combiners, see the Wiring unlimited book,
chapter 4.10: “Solar panels”.
9.5.8. Optimisers cannot be used
Do not use solar panels with optimisers together with the solar charger.
Nearly all optimisers contain an MPPT or other tracking mechanisms and this interferes with the MPPT algorithm in the solar
charger.
9.5.9. Earth fault detection missing
This solar charger is not equipped with an earth fault relay or an earth fault warning circuit. Use an external ground fault relay or
ground fault detector.
9.5.10. Ground current
The system should not have a current flowing to ground under normal operation.
If a ground current is detected, first investigate all the equipment connected to that system and check for ground faults.
Next, check how many connections to ground the system has. There should only be a single point in the system connected to
ground . This should be at the battery.
For more information on system grounding, see chapter 7.7: "System grounding" in the Wiring Unlimited book.
The solar charger is non-isolated, the minus of the PV input is at the same potential as the minus of the battery output.
9.6. Communication issues
This chapter describes issues that might arise when the solar charger is connected to the VictronConnect app, other Victron
devices or third-party devices.
9.6.1. VictronConnect issues
For a full troubleshooting guide on the VictronConnect app see the VictronConnect manual.
9.6.2. VE.Direct port communication issues
These are not common and if this occurs it is probably due to one of these issues listed in this paragraph.
Physical cable connector or data port issues Try a different VE.Direct cable and see if the unit will now communicate. Is the
connector inserted properly and deep enough? Is the connector damaged? Inspect the VE.Direct port, are there bent pins? If this
is the case, use long nose pliers to straighten the pins, while the unit is unpowered.
VE.Direct communication issues To check if VE.Direct communication is operating correctly, connect the solar charger to a
GX device and check if the controller shows up on the GX device’s list. If it does not show up, check that TX port function in
VictronConnect is set to “Normal communication".
VE.Direct TX port issues Check the “TX port function” setting in VictronConnect. Does the set function match the application it is
being used in. To test if the TX port is operational check its functionality using a TX digital output cable.
VE.Direct RX Port issues Check the “RX port function” setting in VictronConnect. Does the set function match the application it
is being used in. To test if the RX port is operational check its functionality using a VE.Direct non-inverting remote on/off cable.
9.6.3. VE.Can port communication issues
These are not common and if this occurs it is probably due to one of these issues:
• Try a different RJ45 cable and see if the unit will now communicate.
• Do not use self-made RJ45 cables, always use a manufactured cable. This rules out connector crimping issues.
• The RJ45 UTP cable needs to be a “straight” cable. Cross-over cables cannot be used. For more information see the book
Wiring Unlimited paragraph 5.3: “RJ45 straight UTP cable”.
• Is the connector inserted properly and deep enough? You will need to hear a click.
• Is the connector damaged?
MPPT solar charger manual
Page 58 Troubleshooting and Support
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