Search found 52 matches

by quamau
May 12 2015 10:28am
Forum: Battery Technology
Topic: Tesla Powerwall $350 / kwh Retail
Replies: 151
Views: 19584

Re: Tesla Powerwall $350 / kwh Retail

Same here (Italy). AFAIK, the 7kWh model is meant to maximize the percentage of solar energy that you use locally, and to avoid putting most of it back to the grid. There are many financial models for solar panels at work, and I guess some are (and will be) such that self-consumption becomes the mos...
by quamau
Apr 26 2015 4:13am
Forum: EBike Technical
Topic: CAv3 Powering off Low Voltage Cuttoff
Replies: 14
Views: 1741

Re: CAv3 Powering off Low Voltage Cuttoff

Yeah, leave it on for a couple of days at least. AFAIK, when the charger switches on/off (red/gree light), this means that one cell is high and hits HVC. The other situation is when one cell is low, so the charger will go to green and simply stay there. It's at that point that the real balancing act...
by quamau
Apr 25 2015 5:21am
Forum: EBike Technical
Topic: CAv3 Powering off Low Voltage Cuttoff
Replies: 14
Views: 1741

Re: CAv3 Powering off Low Voltage Cuttoff

Not even access to the balancing plug of the BMS?
by quamau
Apr 25 2015 3:31am
Forum: EBike Technical
Topic: CAv3 Powering off Low Voltage Cuttoff
Replies: 14
Views: 1741

Re: CAv3 Powering off Low Voltage Cuttoff

One dead/unbalanced cell? Have you access to single-cell voltage?
by quamau
Apr 07 2015 4:44pm
Forum: Items for Sale - New
Topic: Welding battery packs in Europe
Replies: 240
Views: 44577

Re: Welding battery packs in Europe

Hi Schwibsi, can you advise on a small / medium saddle bag capable of holding 5p10s of 18650 cells? A different side of the same question is: can you please tell me, based on your judgement, which is the minimum number of parallel cells for say 20A continuous (mountain area here)? Is my 5p estimate ...
by quamau
Jan 27 2015 4:57pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10928

Re: Did I let my LiFePo4 pack die?

Killing a LiFe pack is not impossible but also not easy. Chances are you'll recover everything.

How and where do you measure the 21V? Is there a BMS attached to the pack?
by quamau
Jan 18 2015 5:45am
Forum: EBike Technical
Topic: Infineon controller bricked while programming?
Replies: 0
Views: 461

Infineon controller bricked while programming?

Hi there, I have damaged a controller which I'd like to recover. I am not in a hurry because a replacement is on its way, but I could use a spare. I am writing here because I hope to find someone that can guide me step by step through determining if and where the controller is broken: I have a DMM a...
by quamau
Jan 18 2015 5:13am
Forum: Items for Sale - New
Topic: NEW BOLT ON TORQUE ARMS for IS disc caliper mnts 25$ shipped
Replies: 213
Views: 47200

Re: NEW BOLT ON TORQUE ARMS for IS disc caliper mnts 25$ shi

Hi migueralliart, we exchanged email quite some time ago. I am still interested in at least one rear straight TA. I just notice that you are back. While I go checking if the current status of my bikes can make use of more than one TA, can you please inform me of the availability of the infineon plat...
by quamau
Jan 13 2015 4:36pm
Forum: Battery Technology
Topic: a123 32157 8ah pack builds?
Replies: 21
Views: 3802

Re: a123 32157 8ah pack builds?

Just want to let you know that I am using a pack of 16 A123 32113, and I am very satisfied with it. I am quite sure they are not legit. The weld job sure it's machine made, but it is clearly done afterwards. The weld is extremely weak mechanically, especially at the aluminum side: you either need th...
by quamau
Jan 01 2015 9:56am
Forum: Battery Technology
Topic: 18650 battery pack build Kepler style
Replies: 85
Views: 21318

Re: 18650 battery pack build Kepler style

Awesome job, Kepler! I had to do something similar but my results are waaay less high-quality than yours. My cells are in the 32113 format though, so I had to make as wide a box as possible (ended up with sthg like 10cm) and still the cells need to be installed slightly oblique.. The reason I'm writ...
by quamau
Dec 13 2014 8:15am
Forum: EBike Technical
Topic: Controlling the acceleration of the motor
Replies: 11
Views: 928

Re: Controlling the acceleration of the motor

CAv3 provides current throttle and power throttle in addition to speed throttle. It's not acceleration (doing literally that would be obviously unfeasible: set a given acceleration, wait long enough, and voila' you are at supersonic speed) but practically quite near and probably what the OP meant. I...
by quamau
Nov 05 2014 5:34am
Forum: EBike Technical
Topic: eScan <<my ES kickstarter and new product>>
Replies: 41
Views: 5302

Re: eScan <<my ES kickstarter and new product>>

Hi Agniusm,

Having kids, I would be interested, and no need for precharge here. But a ballpark cost/price would be useful.
by quamau
Sep 03 2014 3:42am
Forum: Battery Technology
Topic: New to soldering A123 LifePo4 packs
Replies: 17
Views: 2553

Re: New to soldering A123 LifePo4 packs

Nominal voltage of 3.7V --> not LifePo4
by quamau
Jul 16 2014 4:03am
Forum: EBike Technical
Topic: Bafang CST 500W Really Really Hot
Replies: 11
Views: 1274

Re: Bafang CST 500W Really Really Hot

I constantly run a Bafang CST uphill, at 48V 20A in hot weather it happens to become lukewarm, that's it. I'm in Italy too, so overheating based upon country can be safely excluded! Definitely a phase/hall combination issue. Actually I did have to swap them, but I have a Lyen controller, your is mos...
by quamau
Jul 13 2014 4:18am
Forum: Battery Technology
Topic: Conductivity improving grease project
Replies: 109
Views: 15534

Re: Conductivity improving grease project

Well, viscosity is a property of fluids, and sure enough everything can be in a sense considered a fluid. However, with the asi70 grease paste being said by the spec sheet to "retain its consistency and properties" between 50°C and 200°C, I take it there is no need to measure its viscosity...
by quamau
Jul 02 2014 4:53am
Forum: EBike Technical
Topic: sine wave controller effeciency and 3077 vs 4110 effeciency
Replies: 5
Views: 882

Re: sine wave controller effeciency and 3077 vs 4110 effecie

I have no answers to offer, but I share the interest for the question.
by quamau
Jun 27 2014 7:21am
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

Re: CA v2 and speed control

Agreed! In my own case, I had very well in mind the pros and the cons, only problem being that my optimum was spot on the middle between a slower winding and a faster. But, generally speaking, and without the intention to relieve sellers from their responibility, I don't think it's overly complicate...
by quamau
Jun 27 2014 3:09am
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

Re: CA v2 and speed control

Motor is a Bafang CST 350W, don't remember the code by heart but is fast, I'm running it at 48V nominal (16S LiFe) and current-limited by CA at about 20A. No problem from the supplier, I was uncertain myself at the time and probably over the discussions we had he misinterpreted, but the fast motor i...
by quamau
Jun 25 2014 8:48am
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

Re: CA v2 and speed control

I believe I have figured it out, eventually. After some depressing tests where changing IntSGain did not apparently change anything, I obtained some effect by drastically increasing PSgain, which is measured in units of V/kmh. At that point, I realized that my motor (after a mistake of the seller) i...
by quamau
Jun 22 2014 4:19am
Forum: Battery Technology
Topic: How to install a cell Low Voltage alarm?
Replies: 22
Views: 1977

Re: How to install a cell Low Voltage alarm?

I am.

Very convenient, so far, at the cost of a little additional burden when you set things up (and a few more wires lying around in your battery box). Once you have the taps, you never know what use might come in handy in the future.

I definitely reccommend such an addition to your future pack.
by quamau
Jun 22 2014 4:00am
Forum: Battery Technology
Topic: eBike Master Switch Design
Replies: 331
Views: 35809

Re: eBike Master Switch Design

Writing to simply let you know of my interest in getting few of them as they are finalized.
Thanks for the great and continued efforts.
by quamau
Jun 20 2014 7:22am
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

Re: CA v2 and speed control

Thanks again, those numerical suggestions are indeed what I was after. Tonight I'll give it a try. Let me mention, though, that I never intended to do anything downhill. English is not my native language, When I say that I am trying to adjust the behavior "when the grade decreases a bit" I...
by quamau
Jun 19 2014 3:33am
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

Re: CA v2 and speed control

Thanks Tekletik, you "interpreted" my words correctly. The point is that, as soon as the limit speed is reached, the power cuts out in a way that might be ok on flat ground (where a sudden "off" to the power would result in mild deceleration) but it's not ok at all uphill, where ...
by quamau
Jun 18 2014 12:06pm
Forum: EBike Technical
Topic: CA v2 and speed control
Replies: 11
Views: 801

CA v2 and speed control

Hello my friends, I am lurking on ES since years, but this is my first request for help. I have just set up a bike with approx 1000W peak power. As I live in a mountain region, when uphill the bike is always at max power. Now, I would like to take advantage of my CA v2.23 and set a maximum speed so ...
by quamau
Feb 01 2011 6:43pm
Forum: EBike Technical
Topic: Hub Motor Cooling Idea
Replies: 26
Views: 2867

Re: Hub Motor Cooling Idea

The guy who did this mod did not report any catastrophic accident, and was extremely satisfied eventually. He had several additional mods for improving cooling ready, but he judged that oil alone was more than enough. I did not do this myself (no need) so I cannot speak for myself. Let me say again,...