FWiW myself and friends put a solar power system with recon'd Telstra batteries together for an off the grid house out the back of Bridgetown (W.Australia) in the mid 1980s.
Given it was private land and farming jack of all trades engineering maybe it was "illegal" - but I recall no mention of that at the time in any of the magazines we read and ears we pulled.
FWiW myself and friends put a solar power system with recon'd Telstra batteries together for an off the grid house out the back of Bridgetown (W.Australia) in the mid 1980s.
Given it was private land and farming jack of all trades engineering maybe it was "illegal" - but I recall no mention of that at the time in any of the magazines we read and ears we pulled.