Improvements in and relating to load balancing

A load balancing apparatus for providing a substantially balanced load on a 3-phase power supply. The apparatus includes first, second and third AC inputs, each having an associated input load sensing circuit, and each AC input configured to supply a respective AC output and a respective AC-DC converter configured to feed a respective DC load. A control circuit configured to monitor the first, second, and third input load sensing circuits and dynamically adjust the power output from one or more of the AC-DC converters based on the monitored load sensing circuits to provide a balanced load on each of the AC inputs. The AC-DC converters are configured to provide a variable DC output voltage, with at least two of the AC-DC converters feeding a common DC bus supplying a battery bank. The control circuit dynamically varies the DC output voltage of one or more of the converters to vary the distribution of the load current supplied by one or more of the AC-DC converters through the common DC bus to the battery bank. WO 2016/048173 PCT/NZ2015/050164 --- 1 --- --- j 15a 5b - - ~ -9a 2a 3 r5a 5c 15b --- ---+6b 9 -6a 13 10 -- --- 8b 6 c 15c 3 a 4a - 7a 7b --- - - 12 7c Figure 1 SUBSTITUTE SHEET (Rule 26)