We review your SolarMan event log, check grid code configuration, and determine whether the trips are caused by grid voltage, system settings, or an isolation fault.
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Great advice from Ronald at Solar Tech Support, got my inverter back on line and stable.
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Important: A grid disconnection is a safety function, not a system failure. Your Sofar inverter is doing exactly what the UK grid code requires — disconnecting when voltage or frequency exceeds safe limits. The system reconnects automatically when conditions normalise.
Sofar inverters report grid faults with specific codes: G-OV (overvoltage), G-UV (undervoltage), G-OF (overfrequency), G-UF (underfrequency), and G-ISO (isolation fault). The code tells you exactly which diagnostic path to follow.
Log into SolarMan and navigate to the alarm or event history. Find the grid disconnection event and note:
For ME3000SP units, check the LCD display for the most recent fault code. The ME3000SP logs faults locally as well as in SolarMan (if the datalogger is connected).
Grid disconnection faults split into two distinct categories:
The AC grid voltage or frequency has exceeded statutory limits. This is an external issue — the local electricity network is out of specification. The inverter disconnects as required by G98/G99 and reconnects when conditions normalise.
The insulation between DC circuits and earth has degraded. This is an internal system issue — water ingress into connectors, damaged cable insulation, or a battery module fault. Requires on-site testing with an insulation resistance meter.
The diagnostic path is completely different for each category. Grid quality faults require monitoring and possibly DNO engagement. Isolation faults require on-site DC testing.
In SolarMan, check the grid code setting under device configuration:
If the inverter still has a factory default grid code from another country, the voltage and frequency thresholds will be wrong — causing disconnections at voltages that are normal for the UK grid. This is particularly common on recently installed or replaced Sofar inverters where the commissioning was incomplete.
Grid code settings require installer-level access in SolarMan. If you need to change it, contact STS or a qualified installer.
If the fault code is G-OV, track the AC voltage in SolarMan across several sunny days to establish a pattern:
For HYD hybrid systems with battery storage, switching to self-consumption mode during peak solar hours can reduce export and lower your contribution to local voltage rise.
If grid overvoltage is persistent, you have two parallel options:
Export limiting reduces your Smart Export Guarantee income but keeps the system connected during periods when it would otherwise trip. For HYD systems with battery, self-consumption priority achieves a similar effect by charging the battery instead of exporting.
Sofar has two distinct product families in the UK, and grid disconnection faults manifest differently on each. The HYD hybrid series (HYD 3600–6000 EP) are all-in-one inverters that handle solar MPPT, battery management, and grid connection. They report grid faults through SolarMan with detailed voltage and frequency data. Because HYD systems have battery storage, they have a built-in advantage — excess solar can charge the battery instead of exporting, reducing contribution to local voltage rise.
The ME3000SP is an AC-coupled system that sits alongside a separate solar inverter. It manages battery charge and discharge but does not control the solar inverter's grid connection. If the solar inverter trips on grid overvoltage, the ME3000SP continues operating normally — it only trips if the voltage exceeds its own AC coupling point limits. This means you may see the solar inverter disconnecting while the ME3000SP stays online, or vice versa, depending on where the voltage threshold is breached first.
For both product families, the underlying cause of grid overvoltage trips in the UK is the same: grid infrastructure that was not designed for the level of distributed solar now connected to it. As solar installations increase in suburban areas, the cumulative export during peak hours pushes local voltage above G98 limits. This is a network-level problem, not a Sofar fault.
Return to the Sofar brand hub to explore other common faults and services.
Sofar support hubWe review your SolarMan event log, check grid code configuration, and determine whether the trips are caused by grid voltage, frequency, or an isolation fault. Clear diagnosis, clear next steps.
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