<< The Mentors and experienced PF users are keeping an eye on this thread for NEC and UL compliance. Please use the Report link in any post that looks problematic >> I am moving the US from Norway, Europe. I want to build a "go green" house, but keep some luxuries. I have a lot of very expensive Hi-end Audio equipment. And a lot of workshop tools. The tools are replaceable, but my Hi-fi is not. It is build in Norway, and it's irreplaceable. I am thinking of Solar panels and Tesla Batteries. As I understand, one can choose if it runs 110V or 230V.? I have read a previous similar thread in here. The issue of having 230-240V outlet in-house was addressed. By running a double (2 poled) circuit breaker, and new wiring with a Euro outlet, one will achieve 240V for appliances in the US. But at the frequency of 60Hz. My issue would be Not wanting to have to run a frequency converter, because of the noise and humming it generates. (as audio fidelity is key here) Some of my equipment can be reconfigured to run 110V @ 60Hz. But I have 5 power amps that Only run 230V. But it does state 230V 50/60Hz. So I'm assuming I can run the hole system at 230-240V in the US at 60Hz, as long as all my equipment states it, right? So I think my question is, Can I implement Solar and Tesla tech into the equation of achieving 230V in house, and would I be able to give back to the grid? or would I need two Tesla battery setups. One for in-house use, and one to feed the grid and the rest of the house? I am an electrician in Norway. So I am competent to rewire parts of the house. We do not have the same system In Norway as in the rest of Europe. But our 220-230V appliances are the same. (400V 3 phase appliances need rewiring for engine speed) As most of Europe has a TN400 system, where the inlet is 400V over 3 phases and N (neutral) separate + Ground. Each phase generating 230V with 3 combinations to N. In Norway most house inlets are IT230 system, where one has 3 phases, each pair ganerating 230V, and ground is separate to the system, running a Ground wire to the outside. (No N) Both systems deliver a +/- 15% 230V 50Hz.