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Author Topic: Maximum SOC setting...  (Read 596 times)

BigPoppa

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Maximum SOC setting...
« on: July 10, 2019, 04:08:42 AM »

What maximum SOC setting are most users using? From what I've been reading about EV Motorcycles in general we don't want to charge it to 100% all the time. I'm leaning towards setting mine to 95% max but I'm wondering if that's too hight and maybe 80% max SOC might be better for long term battery health.

I'm interested in hearing the opinions and experiences of others...
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Doug S

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Re: Maximum SOC setting...
« Reply #1 on: July 10, 2019, 07:54:39 AM »

I still plug in when I get home, and am at 100% in the morning. I'm at almost 48k miles now, and if my battery capacity has changed since it was new, it's unmeasurable. I'm glossing over some details, but the upshot is, no sign of loss of capacity yet.

Yes, you may be able to squeeze out a bit more lifetime from your battery pack by optimizing every last detail, but since the warranty ensures at least 2500 cycles no matter how you treat the battery, I don't think it makes any sense to over-complicate things. Ride the bike, charge the bike.
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ultrarnr

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Re: Maximum SOC setting...
« Reply #2 on: July 10, 2019, 02:47:28 PM »

I charge to 100%. Not going to worry about it and as DougS said, just enjoy the ride.  Ultimately you have no idea what is 100%, you only know what the BMS is telling you is 100%. Could that actually be 80%? Yes it could. You don't have access to the entire battery pack. The total size is 13.5 kWh, you have access to 11.7 kWh. You can't drain it all the way and I highly doubt you can truly get to 100%.
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BigPoppa

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Re: Maximum SOC setting...
« Reply #3 on: July 10, 2019, 05:45:27 PM »

I still plug in when I get home, and am at 100% in the morning. I'm at almost 48k miles now, and if my battery capacity has changed since it was new, it's unmeasurable. I'm glossing over some details, but the upshot is, no sign of loss of capacity yet.

Yes, you may be able to squeeze out a bit more lifetime from your battery pack by optimizing every last detail, but since the warranty ensures at least 2500 cycles no matter how you treat the battery, I don't think it makes any sense to over-complicate things. Ride the bike, charge the bike.

What year is your Energica? Mine is rated at 1200 Cycles @ 80% Capacity (100% DOD) although honestly I’m not sure exactly what that means.

48k miles is impressive. Any major issues with the oil cooled motor and/or liquid cooled vcu? Were you able to get any kind of extended warranty on the battery or did yours come with a warranty longer than the 31k Energica is giving now?

Based on yours and ultrarnr’s feedback I’ll probably go back to 100% charging.
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Doug S

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Re: Maximum SOC setting...
« Reply #4 on: July 10, 2019, 07:52:32 PM »

What year is your Energica? Mine is rated at 1200 Cycles @ 80% Capacity (100% DOD) although honestly I’m not sure exactly what that means.

48k miles is impressive. Any major issues with the oil cooled motor and/or liquid cooled vcu? Were you able to get any kind of extended warranty on the battery or did yours come with a warranty longer than the 31k Energica is giving now?

Based on yours and ultrarnr’s feedback I’ll probably go back to 100% charging.

Okay...sorry, I didn't even realize this was posted in the Energica forum. I have a 2014 Zero SR. If my bike made it easy by having a programmable shut-off level like yours do, I'd probably use it, too. One more reason to be jealous.

I do think I can help you interpret the spec on your bike. It's warranted for 1200 full cycles, from 100% charge to 0% charge (DOD = Depth of Discharge), after which time it will still retain 80% of its original capacity. As others have noted, 0% and 100% are somewhat arbitrary limits defined by the engineering team, enforced by the BMS. It's also very true that you can extend the battery life significantly by not discharging that low and not charging that high. So there certainly is a benefit to using that feature if it's available.
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BigPoppa

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Re: Maximum SOC setting...
« Reply #5 on: July 10, 2019, 08:45:03 PM »

Ah...okay. Thanks for the explanation...that helps a lot. I'll probably set my max SOC to 80%. I don't need 100% for my daily commute since I'm usually charging up at work anyway. Nice to know that 1200 cycles is for a complete 0-100 cycle. It sounds like in normal use I'll probably never approach that limit.
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yhafting

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Re: Maximum SOC setting...
« Reply #6 on: July 11, 2019, 12:13:53 AM »

What year is your Energica? Mine is rated at 1200 Cycles @ 80% Capacity (100% DOD) although honestly I’m not sure exactly what that means.

48k miles is impressive. Any major issues with the oil cooled motor and/or liquid cooled vcu? Were you able to get any kind of extended warranty on the battery or did yours come with a warranty longer than the 31k Energica is giving now?

Based on yours and ultrarnr’s feedback I’ll probably go back to 100% charging.

Okay...sorry, I didn't even realize this was posted in the Energica forum. I have a 2014 Zero SR. If my bike made it easy by having a programmable shut-off level like yours do, I'd probably use it, too. One more reason to be jealous.

I do think I can help you interpret the spec on your bike. It's warranted for 1200 full cycles, from 100% charge to 0% charge (DOD = Depth of Discharge), after which time it will still retain 80% of its original capacity. As others have noted, 0% and 100% are somewhat arbitrary limits defined by the engineering team, enforced by the BMS. It's also very true that you can extend the battery life significantly by not discharging that low and not charging that high. So there certainly is a benefit to using that feature if it's available.

So lets do the math:
The total capacity before reaching 80% cap should be 1200*13,5 = 16 200kwh
If we assume 100wh/km (62,5wh/mi) (which should cover some reasonably spirited drive),  the total distance before reaching that state should be at least 16 200kwh/100wh/km = 162 000 km or 101 250 miles. If most riding is not so spirited (commuting around 60-100 km/h or 40-60mph) you can expect around 70wh/km which leads to 231 kkm or 144kmi.

Based on discussion from electric cars. Most people get more out of their batteries, except when using cars prone to overheat the battery in high temperature environments for long periods of time. Add to this what Doug says, - most people will rarely do 100% cycles, as most charging will take place long time before reaching 0% battery status- thus battery life will be longer.

If i was to give someone advice on charging i would say the most important thing is to generally keep battery temperature within limits when charging. (15-25 degrees Celcius should be optimal.)  Thus for those living in high temperature areas charge at night or in the shade if possible. If your commute allows for a lower state of charge when starting the day- then why not use the feature, although i would not worry much. The intended use is for a lower charge setting is winter storage.
 

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Crilly

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Re: Maximum SOC setting...
« Reply #7 on: July 11, 2019, 01:51:33 AM »

Backwards, km, miles.
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BigPoppa

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Re: Maximum SOC setting...
« Reply #8 on: July 11, 2019, 05:32:01 AM »

If i was to give someone advice on charging i would say the most important thing is to generally keep battery temperature within limits when charging. (15-25 degrees Celcius should be optimal.)  Thus for those living in high temperature areas charge at night or in the shade if possible. If your commute allows for a lower state of charge when starting the day- then why not use the feature, although i would not worry much. The intended use is for a lower charge setting is winter storage.

Thanks...that makes sense. I think I'll leave mine at a 95% SoC limit most of the time and max it out occasionally to balance the cells (I notice the EsseEsse9 balances cells around 99% SoC while charging).
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