separate busbars?

[ebchar]

I'm a complete novice who is following Will's 2000 watt, 24v system outlined here: https://www.mobile-solarpower.com/2000-watt-24v-solar-system.html
My question is about busbars. In Will's diagram, there is only 1 busbar for AC loads. Don't I need 2 busbars, one for positive and one for negative? Thanks for any guidance you can provide.

 

[chrisski]

That picture has a positive dc busbar and a negative dc busbar, but I see no loads attached to the AC, do no AC busbar.