Sunsynk F26 fault: DC busbar unbalanced
Keep an eye on it
Urgency: low
What it means
On split-phase systems the load on the two phases is very uneven, so the inverter's internal DC bus became unbalanced. Spreading the heavy loads usually fixes it.
Likely causes
- Big load difference between phases
- One very heavy appliance on one phase
What you can safely check
- Switch off or unplug heavy appliances (kettle, heater, geyser, pool pump) on the backup circuits.
- Restart the inverter once using its documented switch-off and switch-on procedure.
- If it keeps coming back, stop and call a qualified installer.
When to call a pro
If it doesn't clear on its own, happens often, or comes with burning smells, heat or noise, call a qualified installer.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Source: Deye Hybrid Inverter User Manual SUN-3K…6K-SG04LP1-EU, section 7 “Fault information and processing” (paraphrased)
Sunsynk inverters are built on the Deye platform and use the same F-codes. Check your Sunsynk manual if anything differs.