Recurrent "Grid Over Voltage" faults at solar peak times. We review your SolisCloud data and configure Volt-Watt response to reduce trips.
Book your free remote diagnosticBack to Solis hubNote: This is a grid infrastructure issue. We help you manage it through inverter settings.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
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
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Brilliant support to get my solar battery working again. I didn’t expect help on a Saturday but Ron answered the phone, listened and sent me the information I needed to get it going, answered questions etc. A brilliant service I’d happily recommend.
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Called back within a day and gave good advice.
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
Big thanks to Ron. He was incredibly patient and helpful over the phone, taking the time to walk myself and the installer through every troubleshooting step. Through lots of testing he figured out the issue was definitely a hardware issue, which allows us to consider our next steps. Support fees are clear and they operate a “no fix no fee” policy. It is rare to find that kind of honesty combined with dedicated phone support nowadays. I highly recommend Ron, if you need help with your solar system don’t hesitate to give him a call.
A superb service from Ron who went beyond the normal service received from other Tech support companies. I live abroad and was badly let down when my givenergy system failed (and the company went bankrupt) and the local supplier ran away from the problem. Ron sorted the problem and even accessed specialist coding for the inverter that would not be available for suppliers. Ron also ran a full diagnostic to insure that all was in good working order afterwards. Without Rons support and patient assistance I doubt I would ever have got the system back up and running. Well done and thankyou and you have a customer for the future.
Important: Grid overvoltage is not an inverter fault — it's a protection. When many solar systems export simultaneously, they raise local grid voltage above safe limits. Your Solis is doing exactly what it should do: disconnecting to protect the network. We help you reduce the frequency of disconnections without sacrificing safety.
This is a grid quality issue, not an inverter failure. Follow these steps to understand, monitor, and mitigate the problem.
Log into SolisCloud (soliscloud.com). Navigate to the Event Log or Historical Data section. Find the timestamp when the "Grid Over Voltage" fault was recorded. Click into that event and note:
This data tells you whether the overvoltage is transient (occasional spikes) or persistent (sustained high voltage).
Solis inverters follow the G98 grid code, which requires disconnection when:
In areas with high solar density (many installations on the same street), midday solar export pushes local grid voltage above 253V. This is particularly common in southern England and regions with rapid solar uptake. Check your SolisCloud data:
After a grid overvoltage disconnect, observe the behaviour:
The inverter reconnects within 5–10 minutes. The grid voltage spike was brief and the system recovers naturally.
Action: This is normal grid behaviour. Volt-Watt response will help reduce frequency.
The inverter stays disconnected for 30+ minutes. Grid voltage remains above 253V throughout the solar peak period.
Action: Volt-Watt + export limit required. May need DNO involvement.
Note the pattern over 3–5 sunny days. This helps your engineer decide on the best mitigation approach.
Volt-Watt response is a grid support function. When grid voltage rises above a set threshold, the inverter automatically reduces its power output. Lower export = lower voltage rise = fewer disconnections. To enable:
Volt-Watt typically reduces (but doesn't eliminate) overvoltage events by 50–80%.
If Volt-Watt alone doesn't solve the problem, set a maximum export limit. This permanently caps the inverter's output to reduce peak export and keep grid voltage lower. Trade-off: you lose some peak generation, but avoid repeated disconnections.
Export limiting is a permanent trade-off. Use it alongside Volt-Watt for best results.
The CT (Current Transformer) clamp measures grid import/export. It's used by Volt-Watt and export limiting functions to manage power flow. If installed backwards, the inverter misreads the grid and Volt-Watt/export limiting won't work correctly:
Check the main AC cable where the CT clamp is mounted. The clamp should have an arrow printed on its body. Verify it points the correct way. If reversed, your installer or a qualified engineer should correct it — it's a simple physical fix but requires safe access to the main AC wiring.
A reversed CT clamp is one of the most common causes of ineffective Volt-Watt response.
In areas with high solar density (many installations on one street or circuit), simultaneous export from multiple inverters raises local grid voltage. The voltage rise follows Ohm's Law: V = I × R. If 10 homes each export 4kW on a cable with resistance, the cumulative current creates a voltage drop that adds to the base grid voltage. During peak solar periods (11am–3pm), this can exceed the G98 limit of 253V.
This is not an inverter fault — it's a grid infrastructure issue. Your Solis is protecting the network by disconnecting. Protecting the grid prevents damage to transformers and other customers' equipment. The fault code is a safety feature, not a system failure. Managing the problem requires either: (1) reducing export (Volt-Watt/export limit), (2) improving grid infrastructure (DNO action), or (3) accepting occasional disconnections as normal.
Solis S6 and RHI hybrid inverters support Volt-Watt response — a grid support function that reduces output when voltage rises. This is increasingly expected of solar installers as standard practice. In areas with persistent overvoltage, Volt-Watt can reduce disconnect frequency by 50–80%. Export limiting (capping maximum output) provides additional protection but at the cost of peak generation.
Return to the Solis brand hub to explore other common faults and services.
Solis support hubWe review your SolisCloud data and configure Volt-Watt response to reduce disconnection frequency. We'll also verify your CT clamp is correctly installed.
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