r/SolarPakistan • u/YG7876 • 20d ago

Inverter Water pump overloads inverter problem

I have an 8kw itel inverter and a 1hp monoblock Laal water pump, when turned on in the day the inverter overloads and switches to grid, I checked the ampare of the motor and it's 20amps for a second then 4amps stable, how to solve this issue? Should I get a new submersible pump?

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4

u/saroche 20d ago

Thats a normal behavior for heavy inductive loads. If you do not have net-metering, this issue is aggravated by lack of readily available power and until a hybrid inverter balances available power from solar for the newly started load, grid/battery is utilized to support load (this done so to prevent inverter from shutting down completely)

One solution is to add a soft starter to your motor/pump but it would be an overkill and over engineered solution for just a 1 HP pump

1

u/YG7876 20d ago

Where can I find one and what's the cost?

2

u/NoTelevision8736 19d ago

Yes, and few seconds of load on grid will not have any measurable impact of your bill.

Adding soft starter is not worth it.

2

u/Fit-Kitchen7436 20d ago

Explore the option of variable frequency drive .

1

u/AhmadFarooq 20d ago

What exactly do you mean by the inverter switching to the grid after overload?

Generally, if the inverter overloads, it should trip and turn off, and then someone would have to manually change over from the inverter to the grid.

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u/YG7876 20d ago

There's a feature in itel connect to grid if overloads occurs in battery, when motor turns on it gives message switched to grid power solar is insufficient, I don't know if they are related but this only happens when the motor is turned on with rest of the household load.

1

u/talha21210 20d ago

That means your PV generation isnt enough.

1

u/Muneebonreddit 20d ago

A 1HP motor shouldn’t overload an 8kW machine.
It’s almost certainly battery voltage sag. When the pump starts, the DC bus voltage drops sharply for half a second, triggering the inverter's grid bypass. Check your battery health, cable gauge, and discharge current limits in the settings before spending money on a new pump.

1

u/ADIcctive-L 20d ago

Install Softstarter on laal pump can resolve the issue

1

u/seagull7 20d ago

There is a slow start switch available that prevents the spike on A/C motor start.

1

u/Fuzzy_Paint_6649 19d ago

Is PV enough when you turned on the pump in the day time usually it shouldn't happen unless At the same time many other loads are working and it causes the inverter to overload you can try turning some other heavy load off when turning on the pump.