[George from New England]

DC is for batteries and panels. I won’t use or try to use DC for anything household. Will cost much more in the end.

Your whole house is based on AC 240 split for 120/120 each side. Great, old-school design.

[dhs12345]

Never tried this before but you should be able to run your PC and anything with a bridge rectifier front end off of DC.

120VAC. Drop out is usually around 100VAC (maybe lower 90VAC)? 100VAC = ~ 140VDC which is well above the SELV requirement so that wouldn't work. But maybe you can work around the SELV requirement. Heck 120VAC is managed. Anyway, theoretically, you could run your PC and any like devices off of 140VDC. I might be a reliability hit to the bridge since you are only using one branch.