DGuy Posted February 11, 2020 Share Posted February 11, 2020 Greetings: Just wired my 900GT so I can use my electric vest which takes about 5Amps... and it got me to wondering how much power is available. Has anyone here looked into this, is it documented somewhere? Just how much farkle can I put on this bike? TIA, Guy Link to comment Share on other sites More sharing options...
BBB Posted February 11, 2020 Share Posted February 11, 2020 If you are wiring directly to the battery, via a fused power distributor, then you’ll be fine hooking multiple items up. Just keep them to separate “circuits” Like this fuze block Fuzeblocks FZ-1 power distribution block: Amazon.co.uk: Car & Motorbike Fuzeblocks FZ-1 power distribution block: Amazon.co.uk: Car & Motorbike Red 2015 Tracer, UK spec (well, it was until I started messing with it...) Link to comment Share on other sites More sharing options...
kilo3 Posted February 11, 2020 Share Posted February 11, 2020 Service manual says stator outputs 14.0VAC, 29.6 A @ 5k rpm. The rectifier outputs 14.3-14.7 VDC with a capacity of 50A, but that's it's capacity rating, not actual output. I would guess then based on the stator, you have a total of 38amps at 12 VDC to play around with minus the OEM draw whatever that is. 1 Link to comment Share on other sites More sharing options...
Supporting Member betoney Posted February 11, 2020 Supporting Member Share Posted February 11, 2020 1 hour ago, DGuy said: Greetings: Just wired my 900GT so I can use my electric vest which takes about 5Amps... and it got me to wondering how much power is available. Has anyone here looked into this, is it documented somewhere? Just how much farkle can I put on this bike? TIA, Guy In addition to what @BBB mentioned, there are also "switched" auxiliary power leads available behind the screen on a 2amp circuit. I have my battery tender lead connected direct to the battery, which I also use to power my heated vest and I have my GPS and daytime running lights wired to the switched power leads behind the screen. What devices are you wanting to connect? 1 ***2015 Candy Red FJ-09*** Link to comment Share on other sites More sharing options...
ruenjou Posted February 11, 2020 Share Posted February 11, 2020 I did a measurement on rectifier output in normal operation a while ago and the meter read ~10A. That means we have about 20A for all accessaries at 5000 rpm. Fewer available at lower RPM as voltage drops can been seen. Link to comment Share on other sites More sharing options...
Supporting Member texscottyd Posted February 11, 2020 Supporting Member Share Posted February 11, 2020 One important thing to keep in mind is the current draw for a USB powered device (at 5 volts) doesn’t translate to the same current draw on the 12 volt side of the bike’s charging system. That’s why those 2 amp fuses on the accessory circuits (24 watts max power delivery) can support about 4.8 amps of USB connected devices... transformer loss not withstanding. 3 1 Link to comment Share on other sites More sharing options...
DGuy Posted February 11, 2020 Author Share Posted February 11, 2020 Thanks everyone for the info...Not interested in connecting anything else...I'm just curious as to what kind of power overhead exists on this bike, now I know. More power than I foresee ever needing. BTW I am an electronics professional... Link to comment Share on other sites More sharing options...
BBB Posted February 12, 2020 Share Posted February 12, 2020 10 hours ago, DGuy said: BTW I am an electronics professional... I’m looking forward to your posts on people’s electrickery woes in the future 👍🏻 2 Red 2015 Tracer, UK spec (well, it was until I started messing with it...) Link to comment Share on other sites More sharing options...
DGuy Posted February 12, 2020 Author Share Posted February 12, 2020 4 hours ago, BBB said: I’m looking forward to your posts on people’s electrickery woes in the future 👍🏻 Well I'll do my best but understand, there's a big difference between ELECTRICAL systems of a motor vehicle and ELECTRONICS. ;-)) Link to comment Share on other sites More sharing options...
TTR Ignition Posted February 12, 2020 Share Posted February 12, 2020 On 2/11/2020 at 11:18 AM, kilo3 said: Service manual says stator outputs 14.0VAC, 29.6 A @ 5k rpm. The rectifier outputs 14.3-14.7 VDC with a capacity of 50A, but that's it's capacity rating, not actual output. I would guess then based on the stator, you have a total of 38amps at 12 VDC to play around with minus the OEM draw whatever that is. Not to be rude, but I think you misread the manual (or the manual has a typo). I seriously doubt that the stator output is 14Vac; bike alternators are traditionally in the 30-60Vac range. Not to mention, the RegRec is NOT going to output a HIGHER voltage than the stator! 😉 2 1 TTR Ignition Systems - Teaching Old Bikes New Tricks Shift Sensors - Quick Shift Controllers Plug 'n' Play Quick Shifter Kits for FJ-09 US$150 + $15 shipping - In Stock North American Distributor for Shifting ContRoll Email Link to comment Share on other sites More sharing options...
kilo3 Posted February 12, 2020 Share Posted February 12, 2020 11 minutes ago, TTR Ignition said: Not to be rude, but I think you misread the manual (or the manual has a typo). I seriously doubt that the stator output is 14Vac; bike alternators are traditionally in the 30-60Vac range. Not to mention, the RegRec is NOT going to output a HIGHER voltage than the stator! 😉 From horse's mouth. A diode rectifier can't output more voltage, but a transistor certainly can, and I assume they are just using an off the shelf shindengen mosfet rec/reg. 1 Link to comment Share on other sites More sharing options...
TTR Ignition Posted February 12, 2020 Share Posted February 12, 2020 3 minutes ago, kilo3 said: A diode rectifier can't output more voltage, but a transistor certainly can Only if it's connected to a higher-voltage source. A transistor (or mosfet) connected to 14v (other than at the base) cannot have an output higher than 14v. I think the 'charging system' data is poorly written, and refers to the nominal DC output, not the AC output. TTR Ignition Systems - Teaching Old Bikes New Tricks Shift Sensors - Quick Shift Controllers Plug 'n' Play Quick Shifter Kits for FJ-09 US$150 + $15 shipping - In Stock North American Distributor for Shifting ContRoll Email Link to comment Share on other sites More sharing options...
kilo3 Posted February 12, 2020 Share Posted February 12, 2020 1 minute ago, TTR Ignition said: Only if it's connected to a higher-voltage source. A transistor (or mosfet) connected to 14v (other than at the base) cannot have an output higher than 14v. Well i mean, who's to say if they aren't using a setup circuit and sacrificing some amperage, but I don't think that's worth their money/effort. 1 minute ago, TTR Ignition said: I think the 'charging system' data is poorly written, and refers to the nominal DC output, not the AC output. Agreed but can't assume. Link to comment Share on other sites More sharing options...
ruenjou Posted February 12, 2020 Share Posted February 12, 2020 (edited) The stator open circuit voltage (no load) is >60VAC at 5000 rpm. With a shunt-style regulator, you will observe stator voltage ~14VAC in low or full loads since regulator shorts out some cycles of stator output to maintain 14VDC output. With a series-style regulator, the stator output is ~14VAC at maximum load. However at low loads, some cycles of ~60VAC (~5K rpm) can be observed at stator coil output since the regular "disconnects" the stator from load to maintain DC regulation and the stator coil is open circuit at that moment. FJ09/tracer uses shunt style regulator. Edited February 12, 2020 by ruenjou 1 Link to comment Share on other sites More sharing options...
kilo3 Posted February 12, 2020 Share Posted February 12, 2020 1 hour ago, ruenjou said: FJ09/tracer uses shunt style regulator. You would think it would be more efficient to open the coil vs sinking the excess? What's the reason to do this on a modern bike? Link to comment Share on other sites More sharing options...
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