Fault 18
fault 18
this fault took out my mcb and rcd on cu. now having tried several times to reboot my sunsynk eco 3.6 , it just shows 0 for all 4 dials. does anyone know if this is a internal fuse or relay that is inside that may have blown?
its only 5 weeks old so it looks likely i will have to send it back if theres no easy fix
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This is the Sunsynk documentation for an F18 error:
F18 AC over current fault of hardware
This is an overload on the “Load Terminal”
Possibly caused by heavy surge current from air-conditioners.
This is also quite a common fault can also because by a battery issue but generally it's caused by an rush current to the Load. Switch on at the same time.
We have had experience where people have had F-18 faults during the night again it is often caused by an heavy in rush current too many items switching on together.
You need to separate your essential and non-essential load only have essential on the load connection and none. Essential loads such. As AC on the. Grid side. Remember the inverter sends power from both the Grid connection and a the load connection
F20 DC over current fault of the hardware
This is normally caused by the battery not being able to deliver email to current inverting needs. Overcurrent on the battery.
To clear this fault you must focus on the battery and battery discharge settings.
You need to check the C rating of the battery, can the battery provide the current your system needs you may have an 8 kW inverter but unless the battery can supply 8 kW it will simply crash out.
Check the battery C rating
eck the maximum discharge the inverter is set to
On the controller check the maximum power inverter can supply this is a global setting you can see this on the main controller
Check the battery cables are heavy enough to meet the demands
High current overload on start up may also cause this causes fault
I do not believe there is any internal protection devices. It is possible that the passthrough current that caused the fault has cooked one of the relays.
Before you decide to send it back for repairs, it may be worth while contact Sunsynk support.