Solis OV-G-V01 (Alarm 1010) — Grid Over-Voltage

What it means: The AC voltage the inverter measures at its own grid terminals rose above the upper limit of the grid standard programmed into it, so it disconnected from the grid and stopped generating. Solis logs this as alarm 1010; the manual's fault table lists the LCD message as OV-G-V01/02/03/04 and Solis's own service article extends the range to OV-G-V05, which are different thresholds and trip delays of the same protection. In almost every case the fault is in the incoming supply or in the AC wiring between the inverter and the meter — not inside the inverter.

Why does Solis show OV-G-V01?

• Genuinely high feeder voltage, which on Pakistani distribution networks swings hard by hour of day
• Wrong grid standard selected in the inverter — Solis names the grid code being set improperly as the primary cause of this alarm
• Undersized or very long AC cable between the inverter and the distribution board. The Solis manual's first listed remedy is that the resistance of the AC cable is too high and a larger grid cable is needed
• Loose or corroded AC connections at the inverter connector, the AC distribution box or the meter, which add resistance and let voltage spike under load
• The inverter's own AC voltage measurement drifting out of calibration, which shows up as the LCD reading disagreeing with a meter by more than about 5 V

The Pakistan factor

Two separate Pakistani patterns hide behind the same code. The first is the feeder itself: end-of-line and rural feeders swing widely through the day, and voltage rebounds high the moment a load-shedding slot ends and the neighbourhood load drops off. The second is quieter and more common on newer installs — a long, thin AC cable run from an inverter mounted far from the distribution board. When the array is exporting hard at midday, the voltage rise along that cable is added on top of the feeder voltage, so the inverter sees a higher voltage than the meter does and trips at solar noon while the house supply looks fine. If your OV-G-V clusters at midday rather than in the evening, that is the one to check first. A third, purely administrative cause is worth ruling out cheaply: many units imported into Pakistan are commissioned on whatever grid standard they shipped with, which may not suit the local supply at all.

How to fix it (safe to try yourself)

1. Read the grid voltage on the inverter's own display and write down the time of day. Do this for several days. OV-G-V almost always clusters at particular hours, and that pattern is the single most useful thing you can hand your installer.
2. Count how often it happens. Solis's own guidance is that one or two occurrences a day point to an unstable grid rather than a fault in your system; a continuous alarm needs investigating properly.
3. Cross-check with a plug-in voltage meter at a wall socket on the same phase, at the same time of day. If the socket regularly reads well above the normal supply voltage, the supply is out of spec and no inverter setting will make that safe.
4. Compare the two numbers. If the inverter's display and your meter agree, the grid is high. If the inverter reads much higher than the meter, suspect the AC cable run or a loose connection between them — that is an installer's job, not yours.
5. Report persistent over-voltage to your DISCO in writing and keep a copy. It is their fault to fix, and a supply that is over-voltage is shortening the life of your fridge, motors and LED drivers as well as tripping the inverter.
6. Do not go into the inverter's Advanced Settings yourself. The Solis manual restricts that menu to fully qualified and accredited technicians, and the grid-standard and User-Def protection limits live there. Changing them wrongly removes the protection that is currently stopping an out-of-spec supply from reaching your appliances.
7. Ask your installer to confirm the grid standard matches the site, and to check AC cable size and tighten every AC connection with the supply isolated. Within the User-Def menu the manual permits an OV-G-V1 setting only in the 240–270 V range — a limit may be adjusted inside that range if your electricity company allows it, never disabled.
8. If the inverter's displayed voltage differs from a measured voltage by more than about 5 V, stop here. Solis's own guidance is that beyond that gap no calibration offset can be applied and the unit needs further diagnosis through their service channel — not through settings. Do not open the inverter.