paul, i'm using the little melexis board you sent me to measure current for the peter perkins bms i'm putting together. the bus bar i tested it on is 1 inch wide instead of 3/4 inch, and gives an output of 30 mV/20 amps, for a full range of +/- 1500 amps. i think i may mill the busbar a little narrower (down to 3/4 inch) where the current sensor mounts to get a little higher resolution, but for now i've just changed the software and it works nicely
(do you have any more of the little pcb's made up? i might need to buy a couple more)