I am going to keep this brief;
just editing looks like I failed that
There presently isn't anything on the market specific to the Versys that is series regulated, rather than shunt. There presently are three, CompuFire, Polaris 4012941 and RM Stator RM 30506H
( look up 2008 ZX-14, click on OEM number and 4012941 ( SH 775), plus a host of other numbers comes up) it is listed as Mosfet Voltage Regulator Rectifier.
As to any of these, the best way would be to add a minimum 30 amp rated relay, in Canada I went to Princess auto, picked up two relays and two harnesses, for a total of $20,the relays dovetail together, paralleled everything and used the tail light for control. My install was for a CompuFire, and I retrofitted the relay after finding the drain problem. What I would suggest is to bring the positive wire up to the relay, from the relay you should install a 30 amp fuse, then from the fuse to the battery. BE AWARE THE OEM PLUG AT THE REGULATOR POSITIVE GOES DIRECTLY TO A 30 AMP MAIN FUSE, WHICH IS LIVE ALL THE TIME ---unless
your battery us dead--then no worries-- ( I had to use the negative ground, as everything was buried in the OEM harness )
As to connecting a used or new Polaris , I personally would make up three 14 gauge TEW or other fine strand wire jumpers with 10 gauge spade female stakons on both ends, about possibly 18 inches long, go from bottom of OEM plug which is the 3 phase to new regulator 3 phase input. For the negative use 10 gauge and 10 gauge female spade, run to frame ground by ECU. For positive use 10 gauge and same set up and run to relay as described before.
Several ways to make all joints waterproof if you don't want to source the wiring and plug kit such as what Roadster Cycle has available.
I have several simple ways to waterproof everything once testing is completed, I will explain the cheapest and simpleist. Also it can be easily reversed back to OEM regulator.
take a small zip lock or sandwich bag, punch a hole in the bottom, one bag hole first over the regulator socket the second hole first over the OEM plug, make all your wire connections, ( you can purchase some loom to go over the wire or just electrical tape for abrasion resistance,
your call) take a roll of electrical tape and tape backwards, that is sticky side out, do about three layers over the connections, last wrap change to sticky side in. Take some clear or white sillicone and pump a amount sufficient to cover the connection on both sides, the bag is to allow you to form a smooth covering without getting all ,over your hands, you could also use plastic wrap.
So it comes time you want to switch back, take a utillity knife cut through the sillicone and tape on one side, the whole assembly will come off as 1 mold, since the tape was sticky side out, nothing is stuck to the tape.I have used this method in some extremely harsh conditions, years later I have removed these joints, surprisingly, over time from heating and cooling, expansion etc. , you can read all the markings from the connectors inside the tape, as a example the word Burndy #26 ( for the electricians on this forum)
Info I recieved from LowFlyer would indicate the SH775 will work on the Versys,it has a identical footprint, one thing to be aware is the output could be anywhere between 13.9 and 14.2 depending on the day it was made in China
CompuFire is a solid 14.2 and has a higher current rating,except at idle when the stator can't keep up. It doesn't match the OEM footprint and my cooling finns actually are at right angles to the airflow .
That is it for now,