Search found 380 matches

by thunderstorm80
Feb 08 2018 4:45am
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 608

Re: Cooling vest for hot&humid conditions

I'm suprised no one has come up with a 12v cooler coat that provides actual refrigerated cooling since there are products such as this on the market, https://www.amazon.com/dp/B01N1WQNYM/ref=sspa_dk_detail_4?psc=1 Thermocouples are only few percent efficient, so you would need to spend ALOT of powe...
by thunderstorm80
Feb 07 2018 4:41pm
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 608

Re: Cooling vest for hot&humid conditions

If you want it to be passive, yet absorb heat for hours, then to "recharge" it in minutes the temperature differential you'll have to have to pull out all that heat energy will need to be quite large (meaning, placing it within something VERY cold, (well below water's freezing point; perhaps not qu...
by thunderstorm80
Feb 07 2018 7:27am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1527

Re: Removable method of securing motor's axle nuts

You might find a few options in this thread 8) https://endless-sphere.com/forums/viewtopic.php?f=2&t=26444 I saw this thread and many more similar ones. I don't have the proper skills/knowledge/good access to laser cutting/metal shaping facilities and to plan such a plate correctly regarding to all...
by thunderstorm80
Feb 07 2018 7:22am
Forum: E-Bike Technical
Topic: torque arm picture thread
Replies: 199
Views: 55888

Re: torque arm picture thread

I like that method. If you go back far enough in this thread, I likely posted my version of it, from the death race bike. here it is again. Pinch dropout, on Race bike..jpg Its a really positive method, however you engineer a clamping dropout. Perfect for high power, and strong regen. Feed it enoug...
by thunderstorm80
Feb 07 2018 7:10am
Forum: E-Bike Technical
Topic: Cooling vest for hot&humid conditions
Replies: 6
Views: 608

Cooling vest for hot&humid conditions

Hi, After reading some threads here where different vests were briefly mentioned, I thought it would be effective to start a dedicated thread for it. The problem with reading about different vests on different websites is that they are based on subjective opinions and the full technical specs are di...
by thunderstorm80
Feb 07 2018 6:20am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1527

Re: Removable method of securing motor's axle nuts

Nordlock washers on the nuts torque arms. (if you already have torque arms then they aren't good enough and you need better ones) I use Grin's torque arms. One on each side. One is preloaded in the forward torque direction and one in the reverse. And still - I note that the motor's axle is slowly "...
by thunderstorm80
Feb 07 2018 2:49am
Forum: Motor Technology
Topic: Removable method of securing motor's axle nuts
Replies: 16
Views: 1527

Removable method of securing motor's axle nuts

Hi, The lock-nuts on my H3525 come loose all the time because of the very powerful torque it can provide + changing between forward torque®en + the road vibrations due to the high tire pressure. I have tried applying a special glue for holding metal-to-metal but it also eventually came loose. I k...
by thunderstorm80
Feb 06 2018 5:12am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5640

Re: Using bicycle's frame as heatsink for the Phaserunner

Now that I can finally log the stats from the Cycle Analyst and Phaserunner , I see that even with my kludged on big heatsink, the Phaserunner is still peaking at around 70 degrees Celsius when going up long, big hills. Is it worth trying to get the phaserunner to operate at lower temps or is this ...
by thunderstorm80
Feb 06 2018 5:11am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5640

Re: Using bicycle's frame as heatsink for the Phaserunner

Now that I can finally log the stats from the Cycle Analyst and Phaserunner , I see that even with my kludged on big heatsink, the Phaserunner is still peaking at around 70 degrees Celsius when going up long, big hills. Is it worth trying to get the phaserunner to operate at lower temps or is this ...
by thunderstorm80
Jan 30 2018 12:32pm
Forum: Battery Technology
Topic: Why Li-Ion cells have huge difference between their charge/discharge rates?
Replies: 2
Views: 447

Re: Why Li-Ion cells have huge difference between their charge/discharge rates?

First, before going on with the subject of the topic, you realize that if you are afraid of limping home due to approaching the lvc, you just need to slow down... I remind you that wind resistance energy loss works with the square of speed. With modern CA firmware, you can see your instant Wh/Km rat...
by thunderstorm80
Jan 29 2018 12:13pm
Forum: Battery Technology
Topic: Why Li-Ion cells have huge difference between their charge/discharge rates?
Replies: 2
Views: 447

Why Li-Ion cells have huge difference between their charge/discharge rates?

Hi, Can anyone explain why the huge differences? For example, MG1 cells can be charged at ~0.5C but discharged at ~3C with no problem. Further more, many LiPo's (or as I call them - gunpowder :mrgreen: ) can be discharged at a whopping rate of 90C but only charged at 0.5C~1C or so. Chemistry is not ...
by thunderstorm80
Jan 20 2018 10:50pm
Forum: Battery Technology
Topic: Given 80 90 100 % what is the sweet spot?
Replies: 13
Views: 1422

Re: Given 80 90 100 % what is the sweet spot?

You'll notice I am not advising riding off less than 100% charge. I don't see any benefit to discharging the battery deeper on any cycle. Its time at 100% charge that matters, more than anything. Ride off right away and you have nearly no time full. You are back to 90% in a mile or so. I strongly d...
by thunderstorm80
Jan 16 2018 7:53am
Forum: Battery Technology
Topic: Lithium Batteries Shipping Rules Discussions
Replies: 291
Views: 79756

Re: Lithium Batteries Shipping Rules Discussions

What about flying with Lithium batteries as a passenger? (when going abroad) I saw the new IATA rules several times, and didn't see any limitation on the number of spare <100Wh batteries you can carry inside the cabin. This means that you can carry as many LiGo batteries as you want, until you reach...
by thunderstorm80
Jan 11 2018 9:57am
Forum: Battery Technology
Topic: Building many smaller A123 packs (NO BMS) and add them together
Replies: 12
Views: 1031

Re: Building many smaller A123 packs (NO BMS) and add them together

I was thinking of making several A123 ANR 26650 packs. (3,3v nom and 2300mah, each battery) Im considering having 6 packs, each of the battery pack with 6s10p. 1 pack would then give around 19.8 nom volt and 23AH. I want to connect lipo low voltage alarm to the 6 packs, so i can hear the alarm if s...
by thunderstorm80
Jan 10 2018 5:40am
Forum: General Discussion
Topic: Dogman Dans E bike burns his house.
Replies: 172
Views: 25869

Re: Dogman Dans E bike burns his house.

Wow! Just saw that thread. I am sorry for you, but I am glad that eventually you are able to resolve the damages with not so much losses of money... This thread gave me another reason to stick to my existing A123's, despite the tempting lightweight (but short life-cycle lived) modern cells. I happen...
by thunderstorm80
Jan 10 2018 4:56am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 2833

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

I wanted to find more detailed specs about those cells, but the official ones are very, very shallow. For example, it writes only "standard" charge rate at 0.5C, and I am interested in: 1. The maximum continuously allowed charge rate. 2. The maximum peak charge rate. (Regen peak currents) All(!) 35...
by thunderstorm80
Jan 10 2018 4:53am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

Like I said I bounce my bike for 4.5 year old pack put together with plastic totes and duct tape I've dumped my bike 3 times I beat the s*** out of it on the trail. I believe you have contaminants inside the cell and or impurities. Maybe overcharge over discharge. But vibration on a road bike I don...
by thunderstorm80
Jan 08 2018 10:49pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

As far as I know, there should be no problem with vibration as long as the cells are properly constrained. Zero motorcycles use prismatic cells these days (although Li-ion chemistry). This is a high vibration environment also but they hold up fine. Their packs are now fully potted. The cells inside...
by thunderstorm80
Jan 08 2018 3:02pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

I still didn't get an answer for the most important question: The cells got inflated obviously because of the vibrations and the shocks of the road bike frame + their lack of pressure container. I am wondering, if those cells were meant to work at such unsprung environment even if I pack them with r...
by thunderstorm80
Jan 08 2018 2:59pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

Plus where did you get these cells what kind of tabs they have on them to someone add on some tabs and cut them out of a pack. New used and how old are they mine were probably made in 2010 or something I got him 5 years later or whatever that makes I got them second hand a year a go from a friend w...
by thunderstorm80
Jan 07 2018 5:20pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

I have two 12s A123 20ah packs on my bike for 4.5 years and 1,088 cycles. I use at 40 to 90amp now. I get 17ah at that level. Bulk charge to 3.5v and rarely need balance. I had replaced one in the beginning as it puffed and got soft. I built the pack with plastic totes and fiber duct tape. The one ...
by thunderstorm80
Jan 07 2018 5:11pm
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

A123 20ah as 4s for a car battery sounds good. Like to know how it works out and what size car. 3.5 × 4 = 14 volt high - 2.9 × 4 = 11.4 volt low . A car doesn't have lvc. I mean to use them as an auxiliary 12V battery for emergency - for example to jumpstart a car with a drained lead battery or for...
by thunderstorm80
Jan 04 2018 5:48am
Forum: E-Bike Technical
Topic: Using bicycle's frame as heatsink for the Phaserunner
Replies: 45
Views: 5640

Re: Using bicycle's frame as heatsink for the Phaserunner

you guys are really overthinking this. if you run the phaserunner to the point that it needs such a big heatsink, it will eventually fail from its inability to shed the heat to the outer heatsink over time... its a tiny 6fet controller. The PR has a very good rollback mechanism, and as I understood...
by thunderstorm80
Jan 04 2018 5:44am
Forum: Battery Technology
Topic: A123 20Ah prismatic cells got expanded - What can be done?
Replies: 26
Views: 1956

Re: A123 20Ah prismatic cells got expanded - What can be done?

Sadly, it won't dissolve back. So I just dump those cells, or, use 4 of them as an emergency car starter. I will rebuild the pack with spare good cells I have, and will press it with two aluminium plates. I understand that with proper pressure, even the massive shocks and vibrations of road-bike fr...
by thunderstorm80
Jan 04 2018 5:19am
Forum: Battery Technology
Topic: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells
Replies: 17
Views: 2833

Re: Panasonic NCR18650GA disclosed specs, and 30Q Samsung cells

Just looked there are some really goo$ prices from em3 in the sale section. Gonna grab one too! I know em3ev, and they definitely have good prices and nice packs. I wanted to make an order, but it seems they don't ship their product to Israel. (You can't get shipping quote option to Israel) If some...