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by Cephalotus
May 26 2020 4:02am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

Very good and very helpful.

Thank you very much!
by Cephalotus
May 24 2020 1:15pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

Hey,

very cool. Thank you.

Do you have cycle 1 vs cycle 700 charts for capacity and Ri for the HG2 cells?
by Cephalotus
May 15 2020 6:15am
Forum: Battery Technology
Topic: Best Li-ion cell model for ebike pack?
Replies: 16
Views: 445

Re: Best Li-ion cell model for ebike pack?

Almost all lage battery packs built with those cells (edit: 30Q) have failed in the pedelecforum.de, as users have reported over here. There is no possibility to repair those packs, the cells fail one after one. Only very few people report no issues. Maybe this 30Q cell was never intended to be used...
by Cephalotus
May 14 2020 9:51am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

Yes it would be good to have another cylce test, with lets say: 5A for LG M36 and MJ1 5-10A for 29E7 and M29 10-15A for HG2 and VTC6 with 2A charge current or so That would be way closer to how the cells usually being used in real world. Typically the battery in an electric bike should/will last fo...
by Cephalotus
Apr 29 2020 3:58am
Forum: E-Bike General Discussion
Topic: One stop for solar charging ebike info?
Replies: 33
Views: 821

Re: One stop for solar charging ebike info?

I do recommend "semiflexible" panels wit Sunpower cells. Use moduls with PTFE coating, NOT PET coating. Do NOT treat them as semiflexible panels, they need a very riged surface to mount them. If you let them flex the cells will brake and output power will degrade quicky. Do NOT use high voltage modu...
by Cephalotus
Apr 15 2020 9:42am
Forum: Battery Technology
Topic: Im going RC LiPo - General advice / BMS / Charger
Replies: 27
Views: 766

Re: Im going RC LiPo - General advice / BMS / Charger

That's my point. 1. Don't use cheap cells, especially do not use cheap cells that are optimized for anything but safety. 2. If you build a battery pack build it as safe as possible. 3. Do not abuse it 4. If it catches fire you better have it in a place where fire and smoke are contained. This is qui...
by Cephalotus
Apr 15 2020 8:32am
Forum: Battery Technology
Topic: Im going RC LiPo - General advice / BMS / Charger
Replies: 27
Views: 766

Re: Im going RC LiPo - General advice / BMS / Charger

i was thinking more along the lines of this https://youtu.be/Rv_3vwSZmzA?t=51 Useless, too: https://www.youtube.com/watch?v=WR-Rw0PLgpA Every one of us carries a lipo pack in their pocket next to their balls, relying on BMS only. No, this is not a LiPo pack, it is a single cell with voltage and tem...
by Cephalotus
Apr 15 2020 7:56am
Forum: Battery Technology
Topic: Im going RC LiPo - General advice / BMS / Charger
Replies: 27
Views: 766

Re: Im going RC LiPo - General advice / BMS / Charger

I'll put it in a lipo safe. I know many people are afraid of rc lipo. I belive risk is greatly minimised when the pack is monitored closely. Thats why I'm asking for BMS/Charger recommendations Lipo safe? somthing like that? https://www.youtube.com/watch?v=qQldY7fKn5o Does not even work for small b...
by Cephalotus
Apr 15 2020 4:10am
Forum: Battery Technology
Topic: Im going RC LiPo - General advice / BMS / Charger
Replies: 27
Views: 766

Re: Im going RC LiPo - General advice / BMS / Charger

You will need a very good fire insurance and this will propably cost much more in the end as the cheap cells.

If just 1 large LiPo pack out of 1000 burns down a house it is a bad idea from the economic point.
by Cephalotus
Apr 15 2020 3:44am
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 271
Views: 37175

Re: Around the world on a solar ebike

Hotspots in modules with cracked cells... IR: 50W_Sunpowerzellen_semiflexibel_b.jpg Thermo when shorted, not maximum sun (rotate picture): lensun_quality_16098M050004005_verybad.jpg It is not so bad under MPP, maybe +20K for the worst cell, but I can't find the picture... So under bad conditions bad...
by Cephalotus
Apr 15 2020 3:17am
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 271
Views: 37175

Re: Around the world on a solar ebike

Hi, good that you have not been caught "somewhere" on the road. Closing of borders did happen very fast and you probably would have lost your bike. very interesting. The F717 is a good and cheap chose. I fail to understand why other solar ebikers do not test their modules. The general knowledge seem...
by Cephalotus
Apr 13 2020 7:51am
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 271
Views: 37175

Re: Around the world on a solar ebike

Hi there,

U assume that Covid-19 destroyed your trip so far :-(

Have you already been on the road?

Any news on the technology of your solar bike?
by Cephalotus
Apr 13 2020 7:33am
Forum: E-Bike Build Threads / Photos & Video
Topic: Bulls green Mover E45 Conversion
Replies: 5
Views: 969

Re: Bulls green Mover E45 Conversion

If you are able to understand German you might find that E45 conversion interesting: https://www.pedelecforum.de/forum/index.php?threads/umbau-greenmover-e45-2012-auf-crystalyte-hs4080-ebs-freak.60817/ Pictures do start here: https://www.pedelecforum.de/forum/index.php?threads/umbau-greenmover-e45-2...
by Cephalotus
Apr 13 2020 6:13am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

is that right, do you think? is it the same with the usual e-bike batteries? (car) Lithium-ion battery degradation over time Temperature 40% charge 100% charge 0 °C (32 °F) 40% charge: 2% loss after 1 year 100% charge: 6% loss after 1 year 25 °C (77 °F) 40% charge: 4% loss after 1 year 100% charge:...
by Cephalotus
Apr 12 2020 4:19pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

Moreover, voltage of fully charged 30Q No3 is falling quite fast, also had some strange discrepancy during after 700 cycles SOC measurement. It seems to me that Cephalotus´s (and SamRich´s) remarks on 30Q bad reputation are based on true facts: https://endless-sphere.com/forums/viewtopic.php?f=14&t...
by Cephalotus
Jan 28 2020 10:39am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5794
Views: 319328

Re: Wind and Solar vs Coal, Gasoline, Nuclear

... I was just watching some paid-professional Renewables expert do a little speech at Davos, saying that India could easy build 40% renewables and be cheaper than building coal power stations like India currently plans to... Fact is I am sure India would most certainly do that if RE was cheaper, I...
by Cephalotus
Jan 17 2020 8:20am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5794
Views: 319328

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Governments have to be responsible and realistic about promoting industries that can earn foreign income and revenue. Coal, Gas, even Uranium, are some of our most valuable resources and viable industries. What do you propose to replace them with to generate similar revenue potential and trade poss...
by Cephalotus
Jan 15 2020 6:37am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5794
Views: 319328

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Ahh !, the cosy comfort blanket of AVERAGE statistics ! Reagrding CO2 or fuel consumption the absolute numbers are relevant and CO2 emissions have fallen at 50 Million tonnes from 2018 to 2019. 1) Germany has not reduced its fossil (coal, Gas, Nuclear, etc) generation capacity,.. it has simply adde...
by Cephalotus
Jan 14 2020 11:55am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5794
Views: 319328

Re: Wind and Solar vs Coal, Gasoline, Nuclear

Data for electricty in Germany during 2019 is out renewables for electricity: 42,6% (good wind year) coal is falling fast (happened througout most of Europe because CO2 price rose to 25€/t) CO2 Emission: -50 Million t from 2018 to 2019 specific emissions: 414g CO2/kWh in the electricty sector. I hop...
by Cephalotus
Dec 20 2019 5:01pm
Forum: E-Bike Technical
Topic: BionX and phase runner and gauge sensor?
Replies: 2
Views: 455

BionX and phase runner and gauge sensor?

Hello @justin_le and others, I watched your Youtube video using an old BioX motor with a phase runner: https://youtu.be/Wc8OJtFRUng 1st question: Do you have any idea if it would be possible to use that 350Ohm gauge sensor on the bionX axcle to make a Pedelec conform e-bike with a BionX hub motor an...
by Cephalotus
Dec 12 2019 5:22am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

It takes about 11 weeks to do 500 cycles. My intention is to finish testing at latest 700 cycles. I suppose for most of community will be 700 cycles data informative enough and testing another cells will be more interesting. Moreover, we haven´t enough time frame for long term testing. It is your t...
by Cephalotus
Dec 11 2019 1:26pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 441
Views: 46785

Re: Li-ion cells cycle ageing

Thanks a lot for the updates!

It doesn't take so much time to do 500 cycles, so I hope you will continue to 1.000 cyles and maybe even more in case of cells that show very little aging up to that...

LG MG36 shows amazing performance so far.
by Cephalotus
Dec 03 2019 2:42pm
Forum: General Discussion
Topic: Raised Bed Gardening - Cement Blocks > Greenhouse!
Replies: 264
Views: 36487

Re: Raised Bed Gardening - Cement Blocks > Greenhouse!

Living at 51° North in Germany December days are short, sun is rare and shadows are very long. Our main winter problem is the darkness and lack of irradiation, not so much the cold, if you have cold tolerant plants. this is what I grow in my small cold frame in winter. Sheeting is Plexiglas Alltop (...
by Cephalotus
Dec 01 2019 4:01am
Forum: E-Bike Build Threads / Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 342
Views: 55275

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

Yepp, I have seen that solar velomobile before. An efficient velomobile needs around 200W for riding at 45km/h. Maybe 300W if you include the solar generator incl. mounting. A 500W solar generator is able to produce 2500Wh on a okayish day, so in theory you are able to use 250W battery power for 10 ...
by Cephalotus
Nov 30 2019 9:46am
Forum: E-Bike Build Threads / Photos & Video
Topic: Around the world on a solar ebike
Replies: 271
Views: 37175

Re: Around the world on a solar ebike

Overall, the decreases in peak daily solar watts seem too high to me to be explained by panel degradation alone. I remember Justin commenting on the fact that it was very rainy during the second half of the trip. If it was overcast all day, the daily peak would be much lower. Maybe that's part of i...