To maximize efficiency and reduce cost I am contemplating using the power from solar cells directly as dc without conversion to ac. I plan to wire and connect the solar panels in series and parallel to charge batteries and super capacitors. And then arrange the batteries and super-capacitors to yield 115 volts dc. This arrangement will be completely off-grid. By skipping the inverters, I hope to gain much efficiency and lower cost.
I know direct dc wiring is used in rvs but the voltage is lower. The 12 gauge and 14 gauge wiring in the house is already designed for 115 volts albeit rms ac. The dc should be ok for all loads except ac motors and compressors for which I will either keep a dedicated line from the grid or use inverters just for these.
Besides possible code violations, is there any other reason to not do this?