Never see right voltage charging #'s with sh775 and Lithium

[salty_monk]

I've been using a Shorai with an SH775 for a while without problems. Before I switched it out it had one of the FHA12 or whatever the number is shunt Mosfet types. Also not a problem with the Shorai.
The biggest issue with the Lithium is parasitic drain. They don't have a lot of real capacity so a drain brings them down to a level where there can be permanent damage quite quickly. It's worth having one of the BMS chargers that can manage/balance the individual cells.

On a SHorai you can actually measure the individual cells with a meter in the plug socket if you're careful with the pins....

 

[Who Dat?]

... The research i've done mentions that the SH775 specifically detects a full battery and throws the extra load to an open circuit. ...

I deal a bit with vehicular electrics and have to smirk a bit at comments like this.

Besides the stator inputs and the ground wire, there is exactly ONE wire attached to the r/r. It is usually attached to the battery, but not always directly. When the r/r "detects a full battery", where is this "open circuit" that will recieve the extra load? And, if it's an "open circuit", there is nothing there to accept that "extra load".

By the way, the r/r does not provide a "load", it looks for one. A load is a demand, like a headlight or ignition system.

As others have mentioned, when the difference between charging output and the battery voltage gets less and less, so does the charging rate, the charge is not sent to another location.

 

[pdqford]

^^^^^^^. what he said! Thank You.

If you look at Nessism’s diagram of the recommended way to wire the SH775, or the wiring diagram for most Suzuki’s,, the output of the R/R (the red wire) goes to a junction feeding two parallel circuits. One side of the junction goes through the fuse box and to the battery. The other side of the junction goes to the main harness to power up the rest of the electrical system. I mean, how would the R/R know which one of the two parallel circuits contains the battery?

For example, if your Stator is capable of putting out, say 14.3 volts, but the regulator has thyristors that dump to ground at, say 13.8 volts, 13.8V, is the most voltage you will see anyplace in the power side of the system, assuming no voltage drop due to poor connections, etc. I have read that these newer thyristors are capable of dumping up to 2000 times per second, spreading the stator load as opposed to having a shunt regulator just locking onto ground.

Aside: I retired from my full time job back in 1995 and then five years latter I took every automotive electrical/electronics course out local community college offered.. (Hey, when you are a senior citizen there is no tuition for these courses!) After two years of free courses I sat for the ASE exam in Auto Electronics and one in Auto Drivability, passing both! What I did learn that electricity is electricity. Doesn’t matter if it Auto, Bike, Boat, etc. and that I only know a small fraction about electricity.

Now, back to your regularly scheduled thread.

 

[salty_monk]

I was lucky enough to be with Posplayr on one of the early days of figuring out these Series RR's. Pretty interesting when you see them on a scope, it makes it pretty easy to understand what's happening. It's one of the few ways to see the "smoke" before it escapes

 

[niclpnut]

When I first identified the polaris units (775) as a series regulator, I've been running them ever since and they have maintained 14.5v with agm or lithium batteries.

 

[pdqford]

Good to know. .