Additional battery

i have 17- 430 watt panels a Giv-energy Converter and 2 x 5.2 giv-Energy Batteries
Could anyone tell me if i can add a further battery and store more energy.
and if so would i still qualify for it vat free.
Thank you

Maz Yes, you can add batteries. I believe you can have up to 5 on one inverter. Batteries are currently VAT free.

Cheers Chris