i thaught you only could have 1 ZO2 main system lol i guess the modder was wrong on the first page that everything could go boom... well i honestly don't have any ptoblems 1 main can upkeep the 3 kerbonauts and you don't need much to do so i have a lunar base with 8 ZO2 solar panels and 1 nuclear with a large sidemount EPS and all goes find if you ask me