what about the difference voltages between those different sort of batteries....how can i solve ?

Hi Mathias, I am in a stop and go in south Africa preparing my boat to cross altlantic. I found many issues in my electric diagram. First i will change my old batteries isolator (diodes system) for the cyrix-ct 120amp. I have a pack of cheap deep cycle 3x110amp (330amp total) wet lead batteries for house bank and 1x120amp AGM for cranking. Its the only ones i have on board for the moment. My question is. what about the difference voltages between those different sort of batteries....how can i solve ?

Thanks

Diego