hi d8veh
http://www.ebay.com.au/itm/251354753090?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
i brought one the cheap watts meter and did the shunt mod..and worked perfectly for the BBS01 350w36v 18A... getting Peak Amp of 28 and the rest of reading ..aH,voltage looks normal as expected...