If you've checked the export limit and DC isolator and the system still shows zero output, the portal event log usually identifies the fault without a site visit. We review generation history, fault codes, and configuration changes remotely to confirm whether hardware is involved before recommending an engineer.
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The GivEnergy app or portal shows no solar output despite panels being installed and it being a clear day. This is almost always the export limit set to 0W, the DC isolator switched off, or the inverter in standby mode — all fixable without a site visit.
Generation is happening but the numbers are much lower than expected — or the system produces normally in the morning and stops in the afternoon. The classic afternoon drop is grid overvoltage: the inverter disconnects when grid voltage exceeds 253V.
The portal shows solar output hitting a ceiling (e.g. exactly 3.68kW regardless of sun) and staying flat. This is curtailment — either an export limit in settings, a G99 export restriction from your DNO, or demand-side capping when the battery is full and export is restricted.
Before going deeper, confirm these three things — they account for the large majority of zero-generation reports we receive.
Standard solar panels produce very little output below approximately 200W/m² irradiance. On a heavily overcast UK day, a 4kWp system may only produce 100–300W total — which can look like near-zero in the portal. Check the generation against expected irradiance for today's conditions before assuming a fault. Use the GivEnergy portal's historical comparison to see whether generation matches seasonal norms.
Log into givenergy.cloud → My Inverter → Settings → Export Limit. If this is set to 0W, the inverter will not push any power to the grid. On a sunny day with a full battery, this causes the inverter to clip all solar generation to match only the instantaneous house load — so the portal shows the panels producing, say, 400W instead of the 4,000W they could produce. Increase the export limit to 3,600W or the maximum your DNO connection allows.
In the portal: My Inverter → Event Log. Switch the view to today and look for F01 (grid voltage), F04 (isolation fault), or any fault listed at the time generation stopped. A single F01 at 13:45 and zero solar output from that point is diagnostic of grid overvoltage. Record the code and time — the GivEnergy fault code index gives the specific recovery path for each code.
An export limit of 0W is the single most common cause of GivEnergy showing very low or zero generation on a bright day. The inverter is working correctly — it is simply constrained from exporting, so it clips solar output to exactly what the house can consume at any instant.
The GivEnergy inverter monitors live house consumption via the CT clamp. With export limit = 0W, the maximum solar output the inverter will produce at any moment equals exactly the house consumption reading.
On a sunny afternoon when the house uses 400W and the battery is full: the inverter clips 3,600W of potential solar generation. The portal shows 400W solar — making it look like the panels are barely working.
Before raising the export limit: Confirm your property has an active Smart Export Guarantee (SEG) tariff or export agreement in place. Exporting without an SEG means you are giving electricity to the grid without payment. Octopus, E.on, OVO, and most major suppliers offer SEG tariffs — register for one before enabling export. See the export limit configuration guide for full details.
The PV DC isolator disconnects the solar panels from the inverter. If it is in the OFF position — either accidentally or following a maintenance visit — the inverter has no solar input and will show zero generation regardless of sun conditions.
Check all DC isolators are in the ON position (line symbol / vertical)
If a rotary isolator is stuck or damaged, do not force it — call an electrician
Check the PV MCB in the consumer unit — reset if tripped and observe whether it holds
If the MCB trips again immediately on reset, there is a DC-side fault — do not re-energise without an engineer inspection
After correcting, wait 2–3 minutes for the inverter to detect solar input and begin generating
Under UK grid code G98/G99, GivEnergy inverters must disconnect and stop generating if the grid voltage rises above 253V. This is not a fault — it is mandatory protection. But it causes real lost generation and is common in areas with dense solar installations.
Generation is normal in the morning, then drops suddenly in the afternoon (typically 11:00–16:00 on sunny days). The cut-off point varies — it depends on when grid voltage peaks on your local network.
Open the portal event log (My Inverter → Event Log) and filter to today. Look for F01 fault code entries — grid voltage fault. These will appear at the exact times generation stopped. The fault code description may also show the measured voltage (e.g., "Grid overvoltage: 256V").
Contact your Distribution Network Operator (DNO) — Western Power Distribution, UK Power Networks, Northern Powergrid, etc. They are legally obliged to investigate persistent overvoltage on the network. Reference the fault codes and dates from your portal. If your property is on a long rural spur, a voltage optimiser or a G100 export limitation device may be required as an interim measure.
Active Voltage Management (AVM): Some GivEnergy systems can use reactive power (VAr) compensation to reduce effective voltage at the inverter's connection point. This is a G99 grid connection option — ask your DNO or a G99-qualified engineer whether your installation can have AVM enabled. It reduces disconnections without needing hardware changes.
Even with a non-zero export limit, solar generation will be curtailed when the battery reaches 100% and house consumption is lower than the solar potential. This is normal inverter behaviour — not a fault. But it looks alarming in the portal.
| Situation | Portal shows | Status |
|---|---|---|
| Battery 100%, house uses 400W, export limit 3.6kW | Solar: 4,000W+, export: 3,600W | Normal |
| Battery 100%, house uses 400W, export limit 0W | Solar: 400W (clipped) | Curtailed — fix export limit |
| Battery 50%, house uses 400W, export limit 0W | Solar: 3,000W (charging battery) | Normal — battery charging |
| Battery 100%, export limit 3.6kW, G99 cap 3.68kW | Solar flatlined at exactly 3.68kW | Normal — G99 cap active |
If your installation is under a G99 limited export connection (common for systems over 3.68kW single-phase), the DNO may have set a maximum export cap that the inverter enforces permanently. This is correct operation — the limit is in your grid connection agreement, not the GivEnergy settings.
The GivEnergy portal's Remote Control section allows the system mode to be set to Off or Standby — which stops generation entirely. Third-party integrations including Octopus smart tariffs, Home Assistant, and demand charge programmes can also push this state without the homeowner being aware.
Log into givenergy.cloud → My Inverter → Settings cog → Remote Control. This shows the live state of system controls, not just the scheduled settings.
Click the Refresh button next to System Mode to fetch the live value — the displayed value can be stale. If it shows Off, Standby, or Import Only, change it to Normal (Self Consumption) and click Submit.
Click Battery in Remote Control. Refresh the Pause Battery value — if it shows Paused, change to Not Paused and submit. A paused battery with a full SoC will not permit solar charging and may cause the inverter to curtail generation.
If you have Octopus Intelligent, Home Assistant, GivTCP, or any other third-party connection to the GivEnergy API, temporarily disconnect or pause it. Some integrations set the export limit or system mode as part of their scheduling. If generation resumes after disconnecting the integration, the integration is the cause — reconfigure its export limit settings.
If all software and configuration checks have been completed and generation remains at zero, the fault is likely hardware. These cannot be diagnosed from the portal and require an engineer — but we can usually confirm whether hardware is the cause from monitoring data before a site visit.
GivEnergy inverters have one or two Maximum Power Point Trackers (MPPT) that convert the variable DC output from panels into usable power. An MPPT fault or failed input stage means the inverter receives no usable solar input even though panels are live.
The portal will show 0W PV input with no fault code — the inverter is running, connected to the grid, but not processing any solar.
Corroded DC connectors (MC4 connectors on the panel strings), reversed polarity on a string, or a failed isolator can all prevent solar DC from reaching the inverter input. This is also the failure mode after roofing work — roofers sometimes damage DC cables.
Individual panel failures (failed bypass diodes, delamination, cell cracking) reduce string output significantly. A single failed panel in a series string reduces the entire string's output. Chronic shading from new nearby structures has the same effect.
The configuration checks above resolve the majority of zero-generation reports. If you've worked through them and generation is still missing, the portal monitoring data usually points directly to the cause — without a site visit.
A remote session pulls the portal event log, generation history, PV voltage readings, and settings audit trail. In most cases we can confirm within 30 minutes whether the fault is configuration, grid-side, or hardware — and whether an engineer visit is actually needed. Free — £75 only if we fix it remotely.
How to set the export limit correctly — G98 connections, SEG tariffs, and DNO agreements.
Full reference for F01, F04 and all other fault codes — causes and recovery steps.
Blank display or system won't restart — covers isolators, deep discharge, and hardware faults.
CT clamp installed backwards or on the wrong cable — causes and correction procedure.
This is a brand-specific version of our general system not producing guide, which covers all brands.
A remote diagnostic reviews your portal generation history, PV voltage logs, fault code timeline, and settings audit trail. In most cases we establish the cause without a site visit — and confirm whether an engineer is actually needed before you pay for one.
I’ve worked on hundreds of GivEnergy systems and know the kit inside out. If yours is playing up, my promise is simple — no fix, no fee: just £75 if we fix it, free if we don’t.
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