| Hi Peter, I have no information regarding the John Deere 48v alternator, other than it can take out an unprotected brushless DC motor controller. JD wanted to make sure, so they repeated the experiment until all the hand built prototypes were toast. Its good to work with JD, enlightening even. Note that you might do better. The usual automotive type of alternator is designed for production ease, and can be built without consideration for efficiency as a result of superior air cooling. At full output, usually screaming, they're about 55% efficient. Not a problem in an open frame mower with a 40hp Kubota. But not the best way to yield electricity from diesel either. Zena makes some interesting alternators. They might make a 48v unit that would include an adjustable voltage and charging rate. It will share the same automotive based design and construction, so heat and efficiency are again a concern. Would you consider a Mars motor and a regen braking system? This has been tried using straight diodes (no controller) with predictable results. I've been using an Advanced Marine motor in re-gen braking for my dyno work. It dumps the power back into the same bank from which the test motor draws. The regulation of the load is quite nice. The Kelly KBL301 controller with fan cooling runs 100 amps continuous. You can set the Kelly to limit the peak voltage and current in the set-up, or use a potentiometer to regulate the draw to balance the diesel load as needed. This would be my preferred system. The Mars motor spins up nicely. You can buy one from www.thunderstruck-ev.com, and a regen controller as well. Kelly sells the controller on-line, and delivery and reliability have not been a problem. About the same cost as retail JD. Thunderstruck also sells a small voltage detection module that couples in series to monitor the LiFePo string. One battery gets too high or low, and an alarm can be used to stop charging or limit discharge. My 5% idea that Brian matured into a simple robust product. Thunderstruck sells a 300w Sevcon DC-DC with a 13.2v output for your house bank. Good Luck, Arby --- On Tue, 4/5/11, Peter Hellenius <ptrh963@gmail.com> wrote:
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