Registering for fit scheme


I have recently transferred providers to yourself and need to register for the feed in tariff scheme.

My builder has been in contact after speaking to the electrician and he has asked why the battery schematic is required as no other provider he has dealt with has asked for this.

Do I need the battery schematic to join the scheme?

For clarity the installation was done in 2017 and has been exporting energy ever since but I have previously forgotten to register everything to join with my last provider.