Error 28 - Power Stage Issue; Error 33 - Pv Over Voltage; Error 38, 39 - Pv Input Shutdown; Information 65 - Communication Warning - Victron energy MPPT 150/70 Manual

8.11.8. Error 28 - Power stage issue

This error will not auto-reset.
Disconnect all wires, and then reconnect all wires. If the error persists, the charger is probably faulty.
Note that this error was introduced in v1.36. So when doing an update, it might look like the firmware update caused this issue;
but it doesn't. The solar charger was then already not performing 100% before the update; updating to v1.36 or later merely made
the issue more visible. The unit needs to be replaced.

8.11.9. Error 33 - PV over voltage

This error will auto-reset after the PV voltage has dropped to a safe limit.
This error is an indication that the PV array configuration with regard to open-circuit voltage is critical for this charger. Check
configuration, and if required, re-organise panels.
For more information, refer to the

8.11.10. Error 38, 39 - PV Input shutdown

When these errors show, the PV Input is internally shorted to protect the battery from overcharging. Prior to any other
troubleshooting, make sure to update to the latest firmware version.
Possible reasons for this error to occur:
• The "Battery voltage" parameter (12/24/36/48V) is set incorrectly. Use the VictronConnect app to set the correct "Battery
voltage" parameter.
• Another device is connected to the battery, configured to a higher voltage. For example, an inverter/charger is configured to
equalise at 17 Volts, while this is not configured in the solar charger.
Error recovery:
• Error 38: First, disconnect the solar panels and then disconnect the battery. Wait for 3 minutes, then first reconnect the battery
and then the panels.
• Error 39: The charger will automatically resume operation once the battery voltage drops below its maximum voltage setting
(normally Equalisation or Absorption voltages). It can also take a minute to reset the fault.
• If the error persists, the solar charger is probably faulty.

8.11.11. Information 65 - Communication warning

Communication with one of the paralleled chargers was lost. To clear the warning, switch the charger off and back on.

8.11.12. Information 66 - Incompatible device

The solar charger is being paralleled to another solar charger that has different settings and/or a different charge algorithm.
Make sure all settings are the same and update firmware on all chargers to the latest version.

8.11.13. Error 67 - BMS Connection lost

This error shows when the charger is configured to be controlled by a BMS but does not receive any BMS control messages. In
that situation, the charger stops charging by reducing its output voltage to the battery base voltage (12V/24V/36V/48V). This is a
safety mechanism, the reason to still enable the output is to allow a system to self-recover from a low battery voltage situation.
Solar chargers only show this error when there is solar power available, and thus the device is ready to initiate charging. It does
not show at night. And in case there is a permanent problem, the error will appear in the morning and clear at night, and so forth.
Solution: check the connection between the charger and the BMS.
How to reconfigure the charger to standalone mode:
The solar charger automatically configures itself to be BMS-controlled when they are connected to one; either direct or via a GX
Device. And that setting is semi-permanent: power cycling the charger will not reset it.
When removing the solar charger from such a system and reusing it in a system without BMS, that setting needs to be cleared.
Here is how to do that:
• Chargers with LCD display: go into the setup menu, and change setting 'BMS' from 'Y' to 'N' (setup item 31).
• Other chargers: reset the charger to factory defaults with VictronConnect, and then reconfigure it.
Page 65
MPPT solar charger manual
PV voltage too high [53] chapter.
Troubleshooting