There's a different Tamura that wouldn't require major redesign. It takes 5v input. The only problem is the aperture for this Tamura 600 amp sensor is too small:
http://www.tamuracorp.com/clientuplo...L01ZXXXS05.pdf
I have been using 0.75" wide bus bars, but I could just shave them down a bit??? I have been thinking hard about that for awhile.