Key Details of the SH821AA: Type: Series Regulator Rectifier (often categorized within the Shindengen MOSFET series, though, unlike earlier SH-series, it specifically acts as a series regulator to reduce load on the stator). Manufacturer: Shindengen. Bung in a best offer, cheap route to a series R/R https://ebay.us/m/cPCG30
I disagree, Shindengen do make it confusing. Older SH designation are the old shunt type. That includes the 821. The new series R and R they are producing are also named SH. Anyhow, it's a good spare to have.
Sorry Chris = does this fit my hyper? Edit learning mode activated.....so these mosfet/shindengen ones will fit both my hyper and RSV4 (both have lithium batteries fitted) - ive got the little loom jobbies bookmarked also but i can press new cables if i need to and tbh with the RSV4 ill need to as the loom side melted years ago so i replaced it...
With Lithium batteries it seems this would be the way to go https://www.ducatiforum.co.uk/threads/ultimate-rectifier-reg-recs.105000/#post-2320113 Not cheap though.
From what I am reading, provided it is a MOSFET R/R it is compatible with lithium. I would only be buying a Shingenden with a reference that starts FH….. Do your own research first.
My broad brush understanding is the whole point of the MOSFET, is to provide stable 14.5V charging. Lithium chemistry motorcycle batteries should not (Note should not, not must not) be routinely charged at voltages higher than 15V although the universally accepted practical limit is 14.6V. It’s R/R failure that is the danger, the older style could pump the entire output of the generator through the battery and literally boil the acid whereas the MOSFET set up fails to ground, not through the battery. I’m with Chris, if in doubt, buy from the market leader, Shindengen. Andy
Ok - so, first and foremost ive not killed any of my bikes by having lithium batteries on them... Hypermotard 1100EvoSP - installed 8 years (JMT) RSV4 factory 2009 - installed 12 years (JMT up til last month - upgraded to NoCo) old battery still in good health Z1000 (4th gen) - installed 10 years (JMT) All are fine. But, if i can make the whole system work/run better then im all for an upgrade. I have had an issue with the RSV4 where last year i got back from the TT (stripped the bike down for a full clean) and the rec reg connector was black to the point that the plastic plug crumbled apart but im not sure if that was down to dry joints as the system was still working fine. There was extra cable on both the rec reg side and the loom side so i cut it all down and repressed new plugs. Ive only lost one battery on the zed when it got wrote off and the recovery company left the ignition key in and on til the battery died...thats about it. Im not sure im understanding so, the MT07 Shindengen unit is not good for charging any of the 3 bikes? (that is a MosFet) If its not and the UR units are the ones to go for thats fine...ill get them...just wanted to double check.
Apparently Shingenden will answer questions on their product line. Email the reference off a Shingenden R/R to [email protected] Ask them to confirm the type of R/R eg Shunt, Mosfet, Series. Found a post on the UKMonster site where Shingenden had replied that the SH821AA is shunt technology. However, the SH775 and SH847 are SERIES despite having SH reference numbers.
Ok so do the "series" ones do a better job of charging a lithium system? or am i barking up the wrong tree/struggling to understand
Thats great Chris thanks... am i right in saying option 2 is the MT07 so is safe on the Lithium and option 3 does the same job but more efficiently? - and is the net result of more efficient (im right) just give more power for the bike while its running? (and better charging)
The email on the UKMonster site said the SH821AA is a shunt R/R. What it did not say is if it is using Mosfet technology (they are a more efficient shunt type R/R). Drop an email to Shingenden Europe.
My research says SH821AA is the older SCR (silicone controlled rectifier) so not MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Both the SH821AA and the FH****** R/R's shunt power but the MOSFET technology simply runs cooler. As Chris says. The later SH775 and SH847 are the latest Series type which don't shunt excess power so they not only run cool and provide a stable voltage , they also reduce strain on the generator.
This is what I am finding: The Shindengen SH821AA is a 12-volt, three-phase MOSFET regulator/rectifier, often utilized as an OEM part for Yamaha motorcycles (such as the MT-07/FZ-07, 2011–2016). It is designed to handle high-temperature conditions and improve charging efficiency, frequently used in high-performance applications. and The SH821AA is a 12 V, MOSFET-based, 3-phase shunt regulator-rectifier used on mid-size Yamaha bikes, designed to regulate charging around ~14.4 V with roughly 30 A-class capacity, though exact figures are not formally published. However, this is not a Shingenden data sheet. It is referenced as a 3 phase FET The below is from Shingenden Three-Phase Short Regulator/Rectifier (FET) These regulators/rectifiers use MOSFETs and Schottky barrier diodes for the ACG output control elements to produce a synchronous rectification and achieve low-loss and large current. These three-phase short regulators/rectifiers can control up to high generator frequencies.
