Aurora GTI residual current and setting questions

[Jon Miller]

Hello all,

At my work we are looking to use two Aurora PVI 3.6 TL inverters for a 6kW Proven/Kingspan machine.
The site has three phase but we want to install onto two phases to keep inverter costs down.
Normally we would use SMA inverters but the options with SMA are limited for a split phase site as the Windyboy 3300 and 3800 have a max DC of 500 volts which is to low.
The Aurora has a lower cut in of 50 volts and a more programable power curve.

My questions are:

• If I use two transformless inverters with a common earth will I have residual current issues even if they are on different phases, or would I need an isolation transformer?

• As is true with SMA kit I can get the Aurora inverters much cheaper as the PV version, is there any physical difference or can I reprogram an Aurora to be suited to a turbine?

I look forward to any help.

Thanks

Jon[/list][/list]

[Rob Beckers]

Hi Jon,

Hello all,

At my work we are looking to use two Aurora PVI 3.6 TL inverters for a 6kW Proven/Kingspan machine.
The site has three phase but we want to install onto two phases to keep inverter costs down.
Normally we would use SMA inverters but the options with SMA are limited for a split phase site as the Windyboy 3300 and 3800 have a max DC of 500 volts which is to low.
The Aurora has a lower cut in of 50 volts and a more programable power curve.

My questions are:

• If I use two transformless inverters with a common earth will I have residual current issues even if they are on different phases, or would I need an isolation transformer?

You'll need an isolation transformer with one of the inverters.
For transformerless inverters the grid voltage is present on top of the DC voltage at the inverter input. Any time you want to put two or more TL inverters in parallel (ie. connect their inputs together) you'll need an isolation transformer for all but one of them.

• As is true with SMA kit I can get the Aurora inverters much cheaper as the PV version, is there any physical difference or can I reprogram an Aurora to be suited to a turbine?

I look forward to any help.

Thanks

Jon[/list][/list]

You are correct that the Power-One solar inverters are identical in hardware with their wind inverters. The difference is the firmware. Unfortunately there is no way to reprogram one to the other, only the factory can do that.

-RoB-