i believe i looked at zrd.com a couple of years ago. will need to refresh my memory. in any case i preferred an all mastervolt system since this is what they are used to work in SA, the group provides all components (BEP, Czone, Mastervolt) and its worldwide supported. there is a very good book in victron by the founder which deals with DC systems. i do not know about lithium but i believe its main stream in cars and boats. so i like the cutting edge but still prefer to stay mainstream. i do not know the specific price of 24V since it was included in upgrade to Lithium and in total was about 30,000 USD. the digital switching (Czone) was an additional 14000 USD
i am flying next week to sail the boat , by the news Knysna looks like hell from Dante will see.