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Off-FF topic ESS eBike-Supercaps-Solar Proj

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TinyBrain
(@tinybrain)
Posts: 354
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This is an off ForensicFocus topic, I am aware. But

For a national long-term disaster recovery event in Nov 19 we want to build an ESS eBike-Supercaps-Solar system. For this I openly ask if someone has experience in

S2E Solar to eBike (directly!)
S2S Solar to Supercaps

Open questions

?1 charging times
?2 charging capacities
?3 DC-DC conversion losses
?4 outdoor installations
?5 rude-environment helpful tips

Toda.

Who has experience with these approaches or technologies?

If the site admin of FF wants to block me because of this topic. Feel free.

 
Posted : 13/04/2019 9:23 am
TinyBrain
(@tinybrain)
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How long does it take to charge an eBike battery (Bosch Powerpack 500)?

 
Posted : 15/04/2019 8:45 am
Omnius
(@omnius)
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How long does it take to charge an eBike battery (Bosch Powerpack 500)?

https://www.bosch-ebike.com/en/service/faq/how-long-does-it-take-to-charge-the-battery/

 
Posted : 15/04/2019 9:05 am
TinyBrain
(@tinybrain)
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Any supercap life-cycle-shortening mis-engineering aspects (balancing board elements) known? In general who has a running supercap deep-cycle solution in operation?

 
Posted : 16/04/2019 6:29 am
Omnius
(@omnius)
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You'd be better off on r/ebikes than a DF forum. Little bit too niche.

 
Posted : 16/04/2019 10:43 am
TinyBrain
(@tinybrain)
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Oh, not sure you are right. On FF are several highly skilled electronics engineers. May you?

 
Posted : 19/04/2019 4:31 am
TinyBrain
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How many charging cycles of an eBike battery (Li-Ion/LiFePov4) are realistic from experience?

 
Posted : 20/04/2019 2:20 am
jaclaz
(@jaclaz)
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How many charging cycles of an eBike battery (Li-Ion/LiFePov4) are realistic from experience?

897.
or maybe 379, but could be 1247 or 2186

The point is not much about charging cycles but rather on how much energy the battery can keep and return (ASE) after having been charged, and both are actually correlated to DoD (and temperature, and charging voltage level and …).

https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

A history of 80-100% DoD cycles will reduce the ASE, as well as a (relatively) high voltage charging level (which however is needed to get 100% ASE).

The good news are that - on average - the climate in Switzerland is much better than - say - California/Nevada for the duration of these batteries.

jaclaz

 
Posted : 20/04/2019 9:06 am
TinyBrain
(@tinybrain)
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Nice you found batteryuniversity.com - the guy behind is Swiss -)

Do you have an eBike? Can you please share your experience?

 
Posted : 21/04/2019 7:41 am
jaclaz
(@jaclaz)
Posts: 5135
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Nice you found batteryuniversity.com - the guy behind is Swiss -)

Yep, though I would say "of Swiss origins" roll
https://batteryuniversity.com/about/

Realizing that conservative Switzerland could not satisfy his entrepreneurial spirit, he immigrated to Canada in 1966.

Do you have an eBike? Can you please share your experience?

No, but I twice or thrice rode a friend's one for a nice "walkabout" (can we use walkabout for a bike? and for an e-bike? maybe "rideabout" or "cycleabout") and was appointed to the role of Chief Assistance Engineer for the thingy.

Does this qualify me as an expert? ?

This specific bike (an el-cheapest Chinese pedal assist one) - reportedly - had the battery last (with decent capacity left) about two and a half years with a calculated number of cycles (always in the roughly 30%-100% range) of 498, then it started, in the following six months of so, to dramatically fail to be fully charged, until it fell below the 70% capacity (empitically measured, when new it did home-office-and back with 30% charge left, after three years cold not do the whole distance).
The replacement battery costed 95% of the new, discounted price of a whole brand new (still el-cheapest Chinese) bike with a battery with better capacity, so he got a new bike, for which at the moment I have no valid statistical data.

jaclaz

 
Posted : 21/04/2019 10:21 am
TinyBrain
(@tinybrain)
Posts: 354
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Fine, 500 recharging cycles are a good estimate for calculation. We only miss the experience of discharging supercaps to an eBike (replaceable) battery.

Anybody having supercaps in use for electric storage?

 
Posted : 23/04/2019 10:07 pm
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