Warning What does this mean?
Your system is down or running degraded, but this is not an immediate safety danger. Work through the safe steps below.
SMA Inverter Event 801 — Stuck Waiting for Grid Voltage
Event 801 — “Waiting for grid voltage” — means your SMA Sunny Boy cannot see the AC grid at all. Think of it as the inverter saying ‘I am ready, but there is no grid to connect to.’ SMA's official event documentation points at the usual suspects: the AC circuit breaker is off, the AC cable is damaged or incorrectly connected, or the country data set was configured incorrectly at commissioning. The inverter simply waits in standby — nothing is damaged yet. Work through the physical checks before assuming a hardware fault.
What should I do first?
Two quick questions — we'll point you to the right starting point.
Is this code still showing on your inverter's display?
Is your system producing power right now?
What this code means
SMA documents event 801 in its official event-messages reference with the full message ‘Waiting for grid voltage > Grid failure > Check AC circuit breaker’. The documented cause is refreshingly specific: the AC cable is not correctly connected, or the country data set is not correctly configured. In other words, 801 is the inverter reporting that the grid side of its life is missing — as opposed to events like 501 (grid frequency out of range) where the grid is present but misbehaving.
That distinction matters for diagnosis. If the display shows 801, the inverter is not complaining about grid quality; it is complaining about grid absence. On a new installation, that almost always means commissioning is incomplete — the AC wiring is not finished, the breaker is still off, or the country data set was never set correctly. On an existing system that was working yesterday, it means something changed on the AC side: a tripped breaker, a failed isolator, cable damage, or a genuine outage.
What is this downtime costing you?
Rough estimate while your system isn't producing. Adjust the numbers to match your setup.
≈ – kWh of lost production per day.
Estimate only — assumes ~80% real-world output vs. nameplate. Actual losses depend on weather, shading, panel direction, and your tariff.
Common causes
- The AC miniature circuit breaker for the inverter is switched off or has tripped
- A damaged, loose or incorrectly wired AC cable to the inverter
- The wrong country data set selected during commissioning
- A genuine grid outage — no voltage at the inverter's connection point
- A blown AC fuse (on older SMA models with fuses)
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.
When to call an electrician
Opening the inverter to check AC wiring, replacing fuses, changing the country data set, or adjusting monitored grid-voltage operating limits are all installer or electrician tasks — SMA's own corrective measures say grid-limit changes need the grid operator's agreement. If 801 persists with a healthy grid present, SMA directs you to contact Service rather than keep cycling breakers.
Frequently asked questions
What is the difference between event 801 and a grid fault like 501?
Event 501 means the grid is there but its frequency is out of range, so the inverter disconnected. Event 801 means the inverter cannot see any grid voltage at all — absence, not bad quality.
Can event 801 damage my inverter?
No. The inverter sits safely in standby waiting for the grid. The risk is lost production, not hardware damage.
How long will the inverter wait?
Indefinitely — it monitors the AC terminals continuously and begins its connection sequence as soon as voltage is present and stable for the required reconnection time.
I have just had my SMA installed and it shows 801. Is something wrong?
Probably just incomplete commissioning: AC breaker still off, AC cable not yet terminated, or the country data set not set. Your installer should resolve all three in one visit.
Need a professional?
This fault may need professional diagnosis. Contact a qualified solar electrician in your area.
Sources: meaning and troubleshooting verified against the manufacturer's documentation — SMA official event messages documentation (manuals.sma.de) — Event 801 ‘Waiting for grid voltage > Grid failure > Check AC circuit breaker’ (AC cable not correctly connected or country data set not correctly configured); SMA Sunny Boy operating/service manuals