I thought this might be a good place to report an oddity with the SOC gauge on my 2017 DSR. I commute to work every day on my DSR which normally uses from 6% - 7% charge each way. I noticed the other day that when I got to work after charging up to 100% at home, the gauge read 92% which was about normal. However, when I left work that day the gauge read 98%. I thought okay that's cool, I'm not going to complain about gaining 6% extra charge for free. But on the way home I noticed that once I hit something like 94% charge, the gauge dropped to 87% in a very short period of time. After that point, the gauge seemed to function properly without any sudden fluctuations.
I'm just wondering if anyone else has experienced this issue and if this is one of the glitches with the later versions of firmware. I have not updated the firmware since taking delivery of the bike in March of this year.
2016 DSR. And what you described is basically "life" for me with my firmware. Having been through a few versions of firmware and having put some milage with all of them with slow and fast charging, this is "normal". It is important to note the following:
- battery voltage is the only true and reliable way to determine the state of charge of a battery(any battery ironically). But battery voltage slides about a bit if you watch it. If you are using, putting in or letting sit at rest the voltage will be different in all those scenarios.
-soc or state of charge is a porportional representation. Ie. A fraction. So it is only applicable with a known total or max. As we all, I'm sure, have experienced different ranges under different temperatures, various environmental conditions etc. So "full" is really a subjective term, for example "when is a ballon full? Before it pops? But if you fill it with cold air then move to a warm environment, it pops". You get the idea.
-on the software end, it is observable using the zero voltage app to see the "total ah capacity" slide around a lot. The zero motorcycles app no longer displays total kwh. Voltage time amps equals watts... It is very likely a much more complicated problem than it seems. Since really what we all want to know is "how far can I go under the current conditions"
-lastly the top 10% of any battery is a bit subjective, I have noticed this in all the versions of frimware I have used. 10km and soc hasn't moved. Then 1km a % then back to normal sub 90%.
Now, with that all said! It doesn't mean that this isn't fustrating for those afflicted. I think we are all afflicted to a degree, the question is when is it going to show itself. I have travelled a week with completely normal behaviour with the most afflicted and worse version of firmware I have seen. Then suddenly without warning, seemingly completely random it would resume it's erratic behaviour. The latest is better but still no where as reliable as the pre June 2017 version. The soc will eventually find the correct representation, but sitting at a stop, gaining or loosing %'s still unnerves me. Remember this seems to be strictly BMS firmware related. Hopefully new bikes and newer battery packs are immune to these problems.
Morale of the story:. Watch your battery voltage! Whether you are noticing soc reporting problems or not! Just make sure it's not crazy! 100v is about 20% and 112v is about 80%. Its pretty linear between those two. 0%-20% and 80%-100% follow a different curve. 116.4v is full and 96v is empty.
Hope this helps someone! #chargeriderepeat
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