8.5.11. Error 27 - Charger short circuit
This error will auto-reset. If the error does not auto-reset disconnect the charge controller from all power-sources, wait 3 minutes,
and power up again. If the error persists the charge controller is probably faulty.
8.5.12. Error 28 - Power stage issue
This error will not auto-reset.
Disconnect all wires, and then reconnect all wires. If the error persists the charge controller 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.
8.5.13. Error 29 - Over-Charge protection
This error will auto-reset. This protection looks at the actual battery voltage and compares this to the settings. In case your actual
voltage is above what is expected it shuts down to isolate the battery from the rest of the unit. Firstly check battery settings
(absorption/float voltages) to see if something is wrong here. Another possible cause is an over-sized PV array configuration, if
there are too many panels in series the battery voltage cannot be reduced any further. Consider modifying PV panel wiring to
reduce the PV voltage.
8.5.14. Error 43 - Inverter shutdown (Ground Fault)
The voltage difference between Neutral and Ground is too high.
Inverter or Multi (not connected to the grid):
• The internal ground relay is activated but the voltage over the relay is too high. The relay might be damaged.
Multi (connected to the grid):
• The ground wire in the installation is not present or not connected properly.
• Line and Neutral are swapped in the installation.
This error will not auto-reset. Check the installation and restart the unit using the power-switch.
8.5.15. Error 50, Error 52 - Inverter overload, Inverter peak current
Some loads like motors or pumps draw large inrush currents in a start-up situation. In such circumstances, it is possible that the
start-up current exceeds the over current trip level of the inverter. In this case the output voltage will quickly decrease to limit the
output current of the inverter. If the over current trip level is continuously exceeded, the inverter will shut down: wait 30 seconds
and then restart.
The Inverter can supply more power than the nominal power level for a short time. If the time is exceed the inverter stops.
After three restarts followed by another overload within 30 seconds of restarting, the inverter will shutdown and remain off. To
restart the inverter, switch it Off, then On.
If the error persists reduce the load on the AC out terminal by switching off or disconnecting appliances.
8.5.16. Error 51 - Inverter temperature too high
A high ambient temperature or enduring high load may result in shut down to over temperature. Reduce load and/or move
inverter to better ventilated area and check for obstructions near the fan outlets.
The inverter will restart after 30 seconds. The inverter will not stay off after multiple retries.
8.5.17. Error 53, Error 54 - Inverter output voltage
If the battery voltage is getting low and a large load is applied to the AC output the inverter is unable to maintain the proper output
voltage. Re-charge the battery or reduce the AC loads to continue operation.
8.5.18. Error 55, Error 56, Error 58 - Inverter self test failed
The inverter performs diagnostic tests before it activates its output. In the case that one of these tests fails an error message is
displayed and the inverter does not turn on.
First try to restart the inverter, by switching it Off, and then On. If error persists the inverter is probably faulty.
Multi RS Solar
Page 45
Appendix
