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System fault · All setups
Solar system not producing electricity
Panels are on the roof, inverter is installed, but generation is showing zero — or something close to it. The portal shows nothing. The inverter display may be blank or showing a fault.
Free remote diagnostic pay only if we fix it — from £95 if remediable remotely
- Check the basics before calling an engineer
- Fault code guides the diagnosis
- Monitoring offline ≠ not generating
Can't find the cause?
A remote diagnostic session reviews the event log, portal data, and system configuration to identify the cause and tell you whether it needs an engineer on site or can be fixed remotely.
Book your free remote diagnosticSolar system repairJust had my whole givenergy system go down. Battery and inverter. Ron sorted me out today 3 hours to get it all sorted. Clear instructions and successful. Could not ask for better. Now that givenergy has gone bust i was concerned as to where to go for help. I have found it and can recommend them to all you givenergy users out there. Off for a cup of coffee now😄
Eaton Edwards · Jul 2026 Google
Absolutely wonderful. Would recommend without hesitation. I had an issue I was thinking would never be fixed and they fixed it. Help, advice and support every step of the way. I can't recommend highly enough. Thank you so much ⭐
jill brocklehurst · Jul 2026 Google
I had a red status light on my GivEnergy battery pack and Ron at Solar Tech Support was a great help resolving the problem. He was able to do a remote diagnosis of the invertor BMS firmware and hardware and gave very quick practical and professional support. Thanks Rob
Rob Heminsley · Jul 2026 Google
My Givenergy battery stopped working nearly a month ago. After unsuccessfully reaching out to my installer, who looks like he's also busted, I found Solar Tech Support on a Google search. They fixed my issue in a couple of hours. Any frustrated Givenergy customers, I highly recommend these guys.
Sarma Amirapu · May 2026
Ron diagnosed the problem remotely - efficiently and order the part identified as the fault - this part came directly from to me and Ron visited within a few days and within the hour corrected the problem and since everything has been excellent -highly recommended - very pleasant manner and lovely to work with . Ivor Morris.
Ivor Morris · Jul 2026 Google
First: check the inverter display directly. If the monitoring portal shows zero but the inverter display shows a live generation figure in watts, your system is generating — you have a monitoring connectivity issue, not a generation fault. See monitoring offline.
Why a system stops producing
Starting with the most common and easiest to fix.
Isolation switch turned off
AC or DC isolator switched off — after a maintenance visit, a power cut, or accidentally. Easiest fix: check all accessible switches and turn back on.
MCB tripped in consumer unit
The solar MCB or RCD in the consumer unit has tripped. Reset it once — if it trips again immediately there is an underlying fault.
Inverter fault trip
The inverter has tripped on a fault and is showing a red light or fault code. Find the code, understand what it means, then decide whether a single reset is appropriate. See inverter red light.
Grid disconnection or outage
If the grid supply is absent or outside limits, the inverter disconnects and stops generating (G98/G99 compliance). Generation resumes automatically when the grid returns. Check whether your house has any power at all.
DC string fault
A blown DC fuse, open-circuit string, or failed panel is preventing solar energy from reaching the inverter. The inverter may show no fault — it simply has no DC input to convert.
Inverter hardware failure
Less common. The inverter itself has failed — from age, power surge, or component failure. Usually shows a persistent fault code that doesn't clear with reset. Requires engineer diagnosis.
How to diagnose zero generation
Work through these in order on a day with at least some sunlight.
1
Check the inverter display and status lights
Go to the inverter physically and check its display. If there is a fault code visible, that is your starting point. If there is no display at all — completely dark — the inverter has no AC power. If it looks normal and shows output wattage, but the portal shows zero, you have a monitoring issue rather than a generation fault.
2
Check all isolation switches
Locate and visually check: the AC solar isolator (usually a red rotary switch near the consumer unit), the DC solar isolator (on or near the inverter, often labelled DC ISOLATOR or PV ISOLATOR), and any battery isolator. All should be in the ON position. Switches can be knocked off accidentally during maintenance or by curious visitors.
3
Check the consumer unit for tripped breakers
Open the consumer unit and look for any MCB or RCD that has tripped (in the mid or down position). Solar circuits are usually labelled. Reset any tripped breaker — if it trips again immediately, do not force it back on. Call an electrician.
4
Check the portal event log
Open your monitoring portal and look at the event log. Find when generation last showed any output and what events occurred around that time. Fault codes, firmware update events, and connectivity losses are all logged and will point you towards the cause.
5
If all looks normal — check AC voltage at the output
If the isolators are all on, there are no tripped breakers, the inverter display looks normal, but generation is still zero, the issue is likely a DC-side problem — no solar energy reaching the inverter from the panels. This could be a blown DC string fuse, open-circuit string cable, or panel-level fault. This requires engineer investigation to diagnose safely.
Brand-specific zero-generation checks
Some brands have system modes or monitoring quirks that make a system appear to not be producing when generation is actually occurring. Check the note for your brand first.
GivEnergy
GivEnergy hybrid inverters have a Backup-Only mode that prevents grid export and can make the system appear to not produce to the grid — but solar is still generating and charging the battery. Check the System Mode setting in the GivEnergy portal before concluding zero generation. See the GivEnergy hub for portal navigation.
Growatt
Growatt hybrid inverters have a "Battery First" power priority mode that suppresses solar export in the monitoring app even when the PV is generating. Also, Growatt ShineWiFi dongles drop cloud connection regularly — always verify the inverter display shows live generation data before concluding zero output.
Sunsynk / Deye
Sunsynk inverters can enter a latched fault state after a sustained grid event, displaying zero export figures even after supply is restored. A controlled restart — AC isolation off, DC isolation off, wait 2 minutes, restore in reverse order — typically clears this state. If the fault recurs, log the event code from the Settings > Fault Log menu.
Frequently asked questions
Check in this order: (1) the inverter display for fault codes; (2) all isolation switches are on; (3) no MCBs have tripped in the consumer unit; (4) the portal event log for when and why generation stopped. In a significant number of cases it is a switched-off isolator or tripped breaker — simple to fix without an engineer.
Yes — check the inverter display directly. If it shows a live generation figure in watts, your system is generating and the portal offline status is a monitoring connectivity issue. See the monitoring offline page for that fault.
Sudden cessation is usually caused by an inverter fault trip (check the display for a fault code), a switched-off isolator, a tripped MCB, or a grid disturbance that caused the inverter to disconnect. Check the consumer unit and inverter display first, then the portal event log for the exact time and cause.
Very heavy overcast conditions can reduce generation to near-zero — especially in winter. True zero on a sunny day is always a fault. If you're unsure whether weather is the cause, check historical data: on a similar day last week or last year, what was the system producing?
Book
Worked through the checks and still not generating?
If the basics are all correct but generation is still zero, a remote diagnostic session can review the full event log and system data to pinpoint the cause — and tell you whether it needs an engineer visit.
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- Remote diagnosis before any site visit
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