I have three Toyota Prius NiMH battery packs which I have re-wired into three 14.4V 91AH battery banks. My plan is to parallel all three banks into a single regulated 13V output. All of the battery paralleling has been done using Schottky diodes. The total battery capacity will be about 273AH at 14.4V. Figuring out how to charge this much NiMH is the hard part. NiMH batteries require a current limited source for charging. I'd like to charge at a current limited 0.1C to .4C rate, 27.3A to 81A. The charger voltage would need to be at least 20V. Does anyone know where I can find a programmable current limited charger that can do this? Perhaps a 24V programmable 50A charger? Lastly, if it is a switch-mode charger I'm worried about HF RFI. If I can't buy a charger at reasonable cost I will be designing and building one. Thanks for any suggestions. Ed, KI6R, Tucson.