I have 32 pieces of 12V 56Ah AGM batteries here. If I discharge the batteries to 70% I would have 48V 300Ah. I would like to connect this to a Victron multiplus-ii gx 48/5000 inverter. Apart from the installation, I have 6300Wp of solar panels. Every year I inject approx 3500 kWh on the grid. That's why I want a system to store my own energy. The question is would I use all the batteries? So 8 sets of 48V together 300Ah. Total 15 kWh or should I use a few batteries less because I only have 6300 Wp of solar panels? Which Victron multiplus-ii gx should I buy, a 3000 or a 5000? If the batteries have lost their capacity, it is the intention to replace them with LifeP04 cells.