For the first PV system and the DC side,
The most economical solution to the red box 1 converter is a [ Select ] ["DC/DC Buck converter", "DC/AC Inverter", "AC/DC Rectifier", "DC/DC Buck-boost converter", "AC/AC Transformer", "DC/DC Boost converter"] converter.
The most economical solution to the red box 2 converter is a [ Select ] ["DC/DC Buck converter", "AC/DC Rectifier", "DC/DC Buck-boost converter", "AC/AC Transformer", "DC/AC Inverter", "DC/DC Boost converter"] converter.
The most economical solution to the red box 3 converter is a [ Select ] ["DC/DC Boost converter", "AC/DC Rectifier", "DC/AC Inverter", "DC/DC Buck-boost converter", "AC/AC Transformer", "DC/DC Buck converter"] converter.
The most economical solution to the red box 4 converter is a [ Select ] ["DC/AC Inverter", "DC/DC Boost converter", "AC/AC Transformer", "AC/DC Rectifier", "DC/DC Buck converter", "DC/DC Buck-boost converter"] converter.
The most economical solution to the red box 5 converter is a [ Select ] ["DC/DC Boost converter", "AC/DC Rectifier", "DC/AC Inverter", "DC/DC Buck-boost converter", "DC/DC Buck converter", "AC/AC Transformer"] converter. Remember this converter has to be bidirectional.