I purchased the bike sport development rectifer relocater kit, and install the mosfet rectifer today. I think all is good! what do you guys think? 13.8v when ignition switch is on 14v when idleing 14.2 with a bit of throttle
All rectifiers produce heat regardless of the type. The benefit of the Mosfet is in the event of failure, it won’t boil your battery like the early type used by Ducati. Andy
Thanks Andy. I fitted a new mosfet one to my MHR, and then fitted a Lithium battery. Now I'm seeing comments that some mosfet regulator manufacturers are saying their units aren't suitable for lithium batteries. Now I'm very confused.... I thought they all were.
That’s to protect themselves from litigation. Lithium batteries require a very consistent voltage, around 14.2. MOSFET r/rs provide this. Older technology shunt type r/rs put out a voltage that can vary from 13-15. Lead acid batteries can tolerate that but lithium can’t. Any r/r, regardless of whether it’s mosfet or shunt, when it fails it can fail to low or to high ie to putting out a sub 12v voltage or a voltage over 14.5v. For a lithium battery the latter can be catastrophic. Battery management systems as fitted to the better, read more expensive, lithium batteries can mitigate this excess voltage to a degree by throttling the voltage down to 14.2 but the rest has to go somewhere. It’s dissipated as heat and even the BMS can be overwhelmed. There are manufacturers who state their r/r is suitable for a lithium battery, presumably because they’ve fitted the equivalent of a BMS into the r/r so in the event of any failure to high the excess voltage and heat stays around the r/r and doesn’t lead to a thermal event at the battery. in Europe you could check out Ultimate Rectifier, Carmo NL, or Rick’s Cafe Web shop. Alternatively look at the parts Ducati fit to the bikes they sell with lithium batteries eg Panigale and DesertX.
That makes sense. The original r/r was putting out 18v at idle, so I pulled that straight out. It's on my MHR. A quick inspection showed it to be a chinese knock of item fitted by some clown. I fitted a genuine Shindengen item and a voltmeter, then a good quality lithium battery. I'd like to do the same to my 750F1 as the battery is up in the tail fairing, which is an odd place for so much weight. Thanks. Mike
