ultra, do you have the rev 43 is it? update or earlier?
when temps are into the yellow zone, this can cause this behavior as well. As the battery heats up it may want less amps, and can be a bit sensitive looking at volts too. If you are right on the threshold of a curtailment point, the bit of a volt boost the charge costs can be enough to push it into a 'curtail some amps' mode. so it does..... now your voltage drops .3 volts. oh, now you are below the, reduce amps if volts above xx and temp above yy threshold... you wanted 50 amps, ok fine, everything is good. give him his 50 amps... battery volts climb .3 volts from the current flow... hmm he's in the caution zone, volts .vs. amps .vs. high temp. back it down a bit.... and then you swing around. sometimes it'll do this for a bit, other times it may do it a few times and then the charger says, sum ting wong, and cuts out.
right now i just ran the hell out of my bike, battery is about 58 C, it's showing outside temperature as being 114 F. I believe it, this sun beating off the concrete is just stifling, on black it's even worse. The battery's on the case sides are getting some cooling, but the ones deep in the core, i bet they are more like 70 C, it takes a while for that heat to bleed it's way out. This can throw voltages way off too, and make them swing wildly with even moderate current flow, which of course causes current fluctuations. It won't let me go past 20 amps fast charge and cut me down to 10 amps l2 charge top. it started out ok, but after a minute or so, swung a bit and cut down. Swinging can be an issue when heat is involved, especially if it's possibly uneven heating, not just a long drive doing a slow overall heat up.
a loose bus would be hot and kind of stay there, the heat would radiate into the batteries via their tabs. it's also get progressively worse until you either faulted something out or it btfu. it'd get so bad, the overheat and cooling making the problem worse, making the volt swing worse, until you'd get like a 20 volt swing when you romped it, and that'd fault you out.
don't quote me on this but, if it was a bus that was that loose, id think that charging would push the volts up really high too and you'd see several percent percent rise when you put some amps thru it because of the loose connection resistance forcing volts up to get past it.
ultrarr, if you are hitting the balance screen at 57 percent charge you got a big problem there. id love to see your cell volts high / low when that happens.
one other thing to keep in mind folks.
the charger itself. it gets the shit beat out of it by people, bending kinking, twisting, all sorts of mechanical abuse on those cables. Twisting bending, torquing on the inner plug as people jackass around trying to force it into and wiggle wiggle it into their cars trying to make it ^%&&^%$%^ turn on etc !!! This elongates the holes in the cable, deforms pins, possibly loosens solder joints / potting from excessive roundy roundy on it. THAT all causes resistance and heat which forces volts higher to get it past. DIRT is another huge issue, if that cable starts corroding, you won't be able to really see it by looking down into it, you really won't see it very well but your connection sure WILL see it!! Dirt and corrosion and stuff loosening up, as you start pushing amps thru it the volt will go much higher because of the resistance that all creates, and it will rise pretty quickly too. maybe your battery, being measured at your bike is only 324 volts... it looks fine to you, because on your end it is, but the charger measuring at it's dirty plug head is seeing 342 volts because of the bad connection. Your bike told it 340 was it's max volts during the handshake, so now the charger is saying, ok battery is filling up, shift to top off / balance amps. it cycles a few times then says sum tin wong and shuts down.
the problem may not necessarily be you, but the charger, it's cable, etc.
YOU take care of your bike, you paid good money for it and want it to last a long long time.
who takes care of the public charger that gets used like a rented mule?
Aaron
