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.
Growatt Inverter Error 58 — Is Low Output Voltage Dangerous?
Error 58 on a Growatt SPF off-grid inverter means the AC output voltage has fallen too low — outside the range the inverter considers safe. The inverter shuts its output down to protect your appliances. The usual trigger is simply too much load, and it often clears after you shed load and restart.
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
This code belongs to Growatt’s SPF off-grid range (SPF 3500/5000ES, SPF TL HVM series). In the manual’s fault reference table, code 58 reads ‘Output voltage is too low,’ and the troubleshooting section groups it with code 06 as ‘Output abnormal’ — the inverter’s output voltage has gone higher than 280Vac or lower than 80Vac. Either way, the inverter decides its output can’t be trusted and shuts it down. In practice you’ll see the code on the display with your loads dead — even though the panels may be producing fine and the battery may be full.
The most common real-world cause is overload. Off-grid inverters have a hard limit on what they can supply, and motor-driven appliances — pumps, compressors, power tools — draw a large surge when they start. If the total demand exceeds what the inverter can deliver, output voltage collapses and 58 appears. A short circuit in the output wiring or a faulty appliance can cause the same collapse.
Growatt’s documented remedy is refreshingly simple: reduce the connected load, then restart the unit. If the error doesn’t come back, it was an overload event and you’ve already fixed it. If 58 returns with little or no load connected, the problem is inside the inverter or the output wiring — and that’s a job for service, not for repeated restarts. The inverter can’t tell a one-off surge from a wiring problem, which is why what happens after the restart matters so much.
One caution: don’t fall into a loop of restarting against the same heavy load. Each restart attempt into a short circuit or a massively overloaded output stresses the inverter. Shed the load first, then restart once. If it trips again, stop and call for service.
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
- Total connected load exceeding the inverter’s rated output.
- Motor or compressor startup surge (pumps, fridges, air conditioners, power tools).
- Short circuit in the output wiring or inside a connected appliance.
- A faulty appliance dragging the output voltage down.
- Loose output wiring connections (for a qualified person to check).
- Internal inverter fault (if it trips with no load).
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
Call a professional immediately if 58 returns with no load connected, if you smell burning or see scorch marks near outlets or the inverter, or if you suspect a short circuit anywhere. Do not keep restarting the inverter into a suspected short — and never open the inverter casing.
Frequently asked questions
Is error 58 dangerous?
The code itself is a protection response — the inverter shutting down rather than feeding bad power to your appliances. But the underlying cause can be: a short circuit in your wiring or an appliance needs prompt professional attention.
What’s the difference between error 06 and error 58?
In Growatt’s SPF documentation they are grouped together as ‘output abnormal’: 06 covers output voltage too high, 58 covers output voltage too low. Both mean the output left the safe window and the inverter shut it down.
Can I reset error 58 myself?
Yes — shed the load first, then restart the inverter. That’s Growatt’s documented remedy. If the code comes straight back, stop resetting and call for service.
Will 58 damage my appliances?
The shutdown is designed to prevent exactly that — the inverter cuts output before bad voltage can reach your equipment. Appliances are far safer with the inverter shutting down than without it.
How much load is too much?
Stay comfortably below the inverter’s rated continuous output (check your model’s nameplate — e.g. 5kW for an SPF 5000ES), and remember motors can briefly draw several times their running power at startup — a fridge compressor or borehole pump can easily exceed the limit for a second or two. If you’re regularly near the limit, you need load management or a bigger inverter — ask your installer.
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 — Growatt SPF series User Manual — Fault Reference Code: ‘58 Output voltage is too low’; Troubleshooting: ‘Fault code 06/58 — Output abnormal (Inverter voltage is higher than 280Vac or lower than 80Vac): 1. Reduce the connected load. 2. Restart the unit, if the error happens again, please return to repair center.’ (official Growatt manuals, africa.growatt.com and hg.growatt.com; content confirmed from the official documents as indexed — direct PDF fetch timed out).