G98
If you are connecting single or multiple phase generators at multiple premises of up to 16A (3.68kW) per phase, you need to complete a G98 application form before you can connect.
If you are connecting large scale generation, above 16A (3.68kW) per phase or energy storage, then you will need to complete a G99 form.
Depends if everything including the battery is all done with a single hybrid inverter, G98, as the system cannot export anymore than the inverter rating. If you have PV and battery with seperate inverters G99 as you can exceed the G98 limits.