Deye F47: AC Over Frequency
F47 means the grid frequency rose above the allowed range, so the inverter disconnected to stay within grid-protection rules. Frequency is set by the utility, not by you, so F47 is almost always a grid-side event that clears on its own when the grid settles.
What usually causes F47
- A short grid frequency excursion on the utility side.
- An unstable or weak grid, more common in some regions and on generators.
- Running off a generator whose frequency drifts can trigger it.
The safe fix, step by step
- Wait for it to clear. The inverter reconnects automatically once the frequency is back in range. A brief, occasional F47 is normal.
- Watch the frequency. Rare events are nothing to act on. Frequent F47 suggests an unstable supply.
- If you run on a generator, make sure it's sized and tuned for a stable frequency.
- For persistent F47, contact your installer or utility about grid stability.
Related Deye codes
FAQ
Can I do anything about grid frequency?
Not directly, it's controlled by the utility. Your role is to notice whether F47 is rare (normal) or frequent (worth raising with your installer or utility).
It happens when I'm on my backup generator.
Generators can drift in frequency, which trips F47. A correctly sized, well-maintained generator with stable output reduces these events.
Sources
- Deye Hybrid Inverter User Manual (F47 = "AC over frequency"; frequency must stay within the specified range).
- Deye dealer technical references for grid-frequency codes.
⚠️ Safety disclaimer. Solar inverters carry lethal DC and AC voltage even when "off". This guide covers observation only. Grid and generator issues should be handled by your installer, utility, or a qualified technician.