My GivEnergy hybrid inverter + battery system had worked faultlessly for 3 years when it suddenly stopped charging and discharging the battery. On contacting my supplier, who had used a sub-contractor for the installation work, I was provided with an email address at GivEnergy but, as it turned out, this is only for GivEnergy Software who are not able to assist. A Google search led to the Solar Tech Support web site, which contains a wealth of helpful information. I requested a remote solar diagnostic, and after providing Ron access to my inverter, he was able to identify and fix the problem within minutes. I am very impressed by Ron’s expertise and knowledge, which included useful information on the current state of GivEnergy Ltd. I would thoroughly recommend Solar Tech Support.
SolaX Grid Disconnection Fault — G99 Overvoltage Fix UK
- Not affiliated with SolaX Power
- No fix, no fee
- G98 & G99 configuration specialists
Grid overvoltage is the most common cause of repeated SolaX disconnections in the UK. We review your SolaX Cloud voltage data, identify the pattern, and recommend the right fix — export limitation, DNO report, or reactive power adjustment.
Book your free remote diagnosticBack to SolaX hubIndependent — not affiliated with SolaX Power.
STS were incredibly responsive and helpful In diagnosing an issue with my GivEnergy inverter. Although distance meant it was impractical for me to use them to fully solve the issue, I’m grateful for the help and detail they provided. Don is a real professional gent and a hero in my eyes.
Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone
I reached on behalf of a friend, who had lost control of their battery following a storm. A couple giv energy “dealers” had attempted and said different fixes. None worked. Solar tech support solved it remotely on the first attempt almost instantly. Genuinely a 10/10 service.
Ron was extremely helpful and tried his best to repair/reset our GivEnergy inverter remotely. In the event he was unsuccessful but he couldn’t have been more helpful. If you have problems with a GivEnergy system please contact him. Highly recommended
Excellent service from Solar Tech Support. Extremely quick to respond, easy to deal with and clearly very talented engineers. They were persistent throughout a complex GivEnergy battery issue and resolved everything completely. Highly knowledgeable, professional and reassuring support from start to finish. Highly recommended.
6-step grid disconnection diagnosis
Work through these steps to understand why your SolaX inverter is disconnecting from the grid, whether it is a network issue or a configuration problem, and what to do about it.
Check SolaX Cloud for the fault code and voltage reading
Log into SolaX Cloud and check the fault history. The specific code tells you what the inverter detected:
If the voltage reading at disconnection was above 253V, the inverter disconnected because UK grid code requires it — the system is working correctly.
Identify the disconnection pattern from the event log
The pattern tells you the root cause. Check the SolaX Cloud event log covering at least the last 30 days:
Export the event log with timestamps — this data is exactly what a diagnostic engineer or your DNO needs to identify the root cause.
Understand the cause — this is usually a grid issue, not an inverter fault
SolaX X-Hybrid inverters comply with G98 and G99 UK grid codes. They are required to disconnect when grid voltage exceeds 253V or when frequency moves outside the safe range. This is a safety mechanism protecting the equipment and the network.
On UK distribution networks where multiple solar systems are connected to the same transformer, simultaneous export during peak generation pushes the local voltage upward. The houses furthest from the transformer see the highest voltage and are the first to trip. This is a network capacity issue — the solution is either export limitation on the inverter side or infrastructure reinforcement by the DNO.
Check if your system needs export limitation configured
If your SolaX system is rated above 3.68kW, it was installed under G99 regulations and may require export limitation. Export limitation restricts how much power the inverter sends to the grid, reducing your contribution to local overvoltage.
On the inverter, navigate to Settings → Advanced Settings → Export Control. If export control is not enabled and your DNO approval letter specifies an export limit, this must be configured. The inverter also needs a CT clamp or meter installed to measure export accurately.
Without correct export control, a G99 system may be non-compliant — the DNO can require disconnection, and you may lose Smart Export Guarantee payments.
Report to your DNO if voltage is persistently above 250V
If SolaX Cloud shows grid voltage regularly exceeding 250V during generation hours, contact your Distribution Network Operator. The DNO is responsible for maintaining voltage within the statutory range. They can adjust the transformer tap setting to lower voltage across the local network, or reinforce the infrastructure if needed.
Find your DNO by entering your postcode on the Energy Networks Association website. When reporting, provide the voltage readings and timestamps from SolaX Cloud. If your neighbours also have solar systems that are tripping, a joint complaint carries more weight with the DNO.
Book a diagnostic for configuration or reactive power adjustments
If grid disconnections continue despite correct export limitation, the inverter's reactive power settings or grid protection parameters may need adjusting within the G99-permitted range. These are installer-level settings that require technical knowledge to configure correctly.
STS can review your SolaX Cloud voltage data remotely, identify whether the issue is a network problem requiring DNO involvement or a configuration issue that can be resolved at the inverter, and recommend the appropriate fix. Remote diagnostic sessions are free — you only pay £75 if we fix it remotely.
Why grid disconnection faults are increasing on UK SolaX systems
Grid disconnection faults are becoming more frequent across the UK as solar installation density increases. The distribution networks in most residential areas were designed for one-way power delivery — from the transformer to the house. When multiple solar systems on the same network begin exporting simultaneously, power flows in the opposite direction and the voltage at the far end of the network rises. Once it exceeds 253V, every inverter on that section is required to disconnect.
Rural and suburban networks are the most affected. These networks tend to have higher impedance — longer cable runs from the transformer — which means voltage rises more for the same amount of export. A street with five or six solar systems can push the local voltage above the trip threshold on a clear summer afternoon, even if each system is relatively small. The houses furthest from the transformer will trip first and most frequently.
SolaX systems installed under G99 (above 3.68kW) should have export limitation configured to reduce their contribution to voltage rise. But many G99 systems were installed without export control enabled, or the CT clamp was never fitted, or the limit was set incorrectly. Correcting the export control configuration often reduces or eliminates the disconnection events without any network reinforcement needed. For systems where export limitation alone is not enough, the DNO needs to adjust the transformer tap or reinforce the local network.
SolaX grid disconnection fault codes
Grid voltage outside the 216V–253V safe range. Most commonly overvoltage above 253V during peak solar export. Inverter reconnects automatically when voltage drops.
Inverter lost synchronisation with grid frequency. Often occurs during grid instability after storms, outages, or rapid voltage fluctuations. Usually clears within minutes.
Inverter cannot measure grid voltage at all. Check AC isolators, consumer unit breakers, and wiring connections. If the mains supply is present, the AC cable or a relay inside the inverter may be faulty.
Internal relay switch malfunction. Can be caused by a poorly connected neutral line or three-phase imbalance on X3-Hybrid systems. May require inverter inspection or replacement.
Grid disconnection faults — common questions
Grid tripping? We identify the cause remotely.
We review your SolaX Cloud voltage data and fault history to determine whether the issue is a network problem requiring DNO action, a missing export limit, or a configuration fix we can resolve remotely.
- Not affiliated with SolaX Power
- No fix, no fee
- G98 & G99 configuration specialists
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