How much total voltage I need for a high voltage battery system?
This depends on inverter battery side specifications. For three hybrid inverter, it is always around 150V to 600V. We just need to consider this HV battery system volatge is being in this range. Foe example, 200V 50Ah, you will have 10kWh battery capacity, and 400V 50Ah you will have 20kWh battery capacity.