Hybrid inverters for 3 phase current - off grid system

[Sunnyfish]

Hello

For my Off-Grid System I have: 13,7 kWp and 13 kWh Batterystorage (2 x Growatt GBLI 6532, 6,5 kWh)

I use 3 x Growatt SPF 5000 ES Inverters. 3 Strings to create 3 phase current, which is one of the main use cases of those inverters. No separate battery inverters are required.

I am not sure how best to represent the system and it´s power generation with the communicating inverters for the generation of three-phase current.

In another post I read, that I this Inverter-hybrid configuration is only available with a grid connected system. What downside do I have when I use this work around (instead of use the off-grid configuration)? Which is the best way to represent this system?

 

Thanks!

 

[hotline_oh]

Dear Sunnyfish,

Thank you for your inquiry.

The off-grid planning in PV*SOL is based on the SMA Off-Grid Configurator program, which we once programmed for SMA. It only contains the SMA design rules and you can only plan off-grid systems with AC-coupled batteries. It is not possible to plan systems in which the battery is DC-coupled.

When using 3 x Growatt SPF 5000 ES, the batteries (2 x Growatt GBLI 6532, 6.5 kWh) are coupled on the DC side. This cannot be simulated correctly with the off-grid tool in PV*SOL.

You have two options:

1. You use the off-grid tool and simulate your DC-coupled system as an AC system. To do this, create a new Growatt SPF 5000 ES in the database for the PV inverters (or use the Growatt SPH 5000 instead). On the ‘Inverters’ page, select 3 x Growatt 5000:

On the ‘Battery Inverter and Battery’ page, select 3 x Growatt SPF 5000 ES and 2 x Growatt GBLI6531/2:

The single line diagram looks like this:

 

2. You switch to a grid-connected system with electrical appliances. You create a new Growatt SPF 5000 ES in the PV inverter database (or use the Growatt SPH 5000 instead). You also create a Growatt SPF 5000 ES with one Growatt GBLI 6532, 6.5 kWh in the battery system database and select "DC intermediate circuit coupling":

On the ‘Inverters’ page, select 3 x Growatt 5000:

On the ‘Battery System’ page, select 1 x Growatt SPF 5000 ES with Growatt GBLI6531/2 and No. of battery systems "2":

The single line diagram looks like this:

In the window “System type, Climate and Grid” you set the “Maximum Feed-in Power Clipping” to zero.

Then no energy will be fed into the grid. The value under “Total Consumption covered by grid” then represents the energy which cannot be covered by the PV system. This energy has to be provided by a generator.