440V system voltage

[HecThor]

Hello All, Just would like to get your opinion on this, the system voltage of the premises is 440V, the available inverters that we can source out only has 400V and 480V output, if ever I use a 400V inverter and connecting it to 440V system, do I need to use a transformer? How about using 480V? Thanks in advance

 

[beanland]

Inverter Range

Inverter Range

Check the dynamic range for the inverter, 440 is 10% below 480. If the inverter is rated for use at 480V +/-10%, then it should operate successfully at 440V. Check the manufacturer literature.

Inverters are current limited so a 480V inverter operated at 440V will have a 10% lower kW rating.

The other option is a boost transformer to change 440V to 480V. The are small for what they do.

 

[HecThor]

Check the dynamic range for the inverter, 440 is 10% below 480. If the inverter is rated for use at 480V +/-10%

Here's the inverter we're planning to use. Thanks for the answer. I guess the best way is to ask the manufacturer.

 

[beanland]

Missing

Missing

I see. Those technical specs are lacking. Good Luck. A boost transformer may be the solution.

 

[drcampbell]

Did you actually measure 440 volts, or is that just how the equipment's labeled?

 

[HecThor]

Did you actually measure 440 volts, or is that just how the equipment's labeled?

440V is shown in the Single Line Diagram for the building

 

[zbang]

440V is shown in the Single Line Diagram for the building

Since AFAICT the Philippines is a nominal 220 volt system, 440 doesn't seem that surprising.

 

[Adamjamma]

It will do the 480 or 440.... but designed for the split 480/240 setups... 440/220... but Acme probably has a transformer regulated for it...

 

[mbrooke]

440V is shown in the Single Line Diagram for the building

Are you sure its not 415 volts? Power in the Phillipnes is often 240/415Y in new installations. I'd break out a volt meter and measure.

 

[HecThor]

Are you sure its not 415 volts? Power in the Phillipnes is often 240/415Y in new installations. I'd break out a volt meter and measure.

Yes I'm sure its a radio station by the way

 

[ggunn]

Check the dynamic range for the inverter, 440 is 10% below 480. If the inverter is rated for use at 480V +/-10%, then it should operate successfully at 440V. Check the manufacturer literature.

Inverters are current limited so a 480V inverter operated at 440V will have a 10% lower kW rating.

The other option is a boost transformer to change 440V to 480V. The are small for what they do.

It may run at 440V but if the voltage dips even a little bit the inverter will go offline. I'd look at buck/boost transformers to center the voltage in the inverter's range; they aren't that expensive.

 

[drcampbell]

... break out a volt meter and measure.

D'Oh!

 

[mbrooke]

D'Oh!

Only if you forget to put your leads back on volts... I've destroyed a few flukes like that :rant: