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Your bus bar is going to need to be whatever the maximum draw of ALL the things connected to it PLUS about 20% overhead for safety. As an example, a 24v 3Kw inverter will be able to draw over 150a on its own. If you add in 30a worth of DC fuse block and devices you'll need 150a + 30a = 180a...

Installing (2) 12V 300ah lithium batteries in parallel configuration. Planning on using a Buss bar for added connections but I have not purchased one yet. I am stationary currently. Can I temp share the positive terminals on each battery to connect everything going to positive side of battery...