What to do when your inverter shows a fault during load-shedding
Load-shedding is hard on inverters: the grid disappears, comes back with surges, and your appliances all switch on at once.
Normal messages during load-shedding
Codes like 'no AC grid' (Deye/Sunsynk F35), grid voltage low (F42) or grid frequency out of range (F47/F48) are usually the inverter reacting to the grid, not a broken system.
Safe steps
- Confirm load-shedding or a municipal outage in your area.
- Switch off heavy appliances so the battery isn't overloaded.
- When power returns, check the inverter's grid breaker on the DB board is on.
- If the message stays after the grid is back, restart the inverter using its documented procedure.
When it's not normal
Call a pro for faults that mention insulation, leakage, arc, earth, BMS or over-temperature that keeps returning – and always if you smell burning or see smoke.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Common questions
- Why does my inverter beep when the power goes off?
- Most inverters beep to tell you they've switched to battery. It usually stops by itself or can be muted in the settings.
- Will load-shedding damage my inverter?
- A correctly installed inverter is designed for grid outages. Surges when power returns are why surge protection is worth asking your installer about.