Search found 39 matches

by EstebanUno
Jul 29, 2015 10:35 am
Forum: E-Bike Non-hub Motor Drives
Topic: New Bafang Crank-Drives
Replies: 4435
Views: 592887

Re: Something slips ???

Occasionally, when peddling hard, and using a high assist setting there will occasionally be sudden grinding slip-like noises coming from the motor. Sounds bad. I don't believe that this is coming from the sprocket/chain/freewheel drive train, as it happens when in a constant gear. I have a quite n...
by EstebanUno
Jul 08, 2015 11:02 am
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

Re: BBS02 number of PAS levels effect

I've found that 5 levels vs 9 has equaled more AH usage for my rides by a factor of about 1.25. So I've been looking for an explanation about how choosing fewer levels translates into practical usage. I found the following article that explained this at Electric-FatBike.com: https://electricfatbike....
by EstebanUno
Jul 01, 2015 10:51 am
Forum: E-Bike General Discussion
Topic: Weight Weenie Ebike
Replies: 87
Views: 9475

Re: Weight Weenie Ebike

I do lots of unassisted riding with the Bafang BBS02 kit, but I've only had it for 2 months. I got the kit for all the steep grades where I live, including a 4 mile 2000 foot climb to my house from anywhere. For the most part, I ride the flat unassisted. Although I agree that any drag is not noticea...
by EstebanUno
Jun 30, 2015 12:10 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

Ok, so now lets say your watt meter is not very good, not guaranteed accurate. Well, if you know your real world measured capacity with that watt meter, you can still do some simple math, and get your range, based that particular watt meter. It won't compare with others, but you will still know wha...
by EstebanUno
Jun 26, 2015 1:16 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

striider wrote:EstebanUno - what was wrong with yours?
Watt hours reported was grossly inaccurate and inconsistent. Deriving the WH from AH yields a V of close to 80 for my 48v system for full cycle. Also 3.25 AH = 104 WH for 1 trip, and 240 for another. This is the same issue reported earlier on the thread.
by EstebanUno
Jun 26, 2015 1:10 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

riba2233 wrote:Samsung 29E are Li-NCA, so nickel-cobalt-aluminium. You can discharge them up to 2.5V per cell if you really want.
Good to know. But looking at the discharge curves etrike posted (thanks), not much is left below 3.1V.
by EstebanUno
Jun 26, 2015 1:06 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

@Esteban Do you have a way to see cell-level voltage? Some BMSs can be fishy, so having the ability to check that periodically can save your pack. No, been counting on the BMS. Individual cell values I have reported have been mathematically derived. Also, do you notice a drop in power as your pack ...
by EstebanUno
Jun 25, 2015 11:43 am
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

if your battery has allowed one cell to hit the LVC then it must be recharged right away. the voltage sag drops the cell voltage from 3.5V down to 2.8V because of the lack of available capacity left in the battery and if you continue using a battery after it has hit the LVC then you have to cut way...
by EstebanUno
Jun 25, 2015 11:25 am
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

Only had the meter for a few rides. 20 dollars ... Gone. Today US ebay seller emilyandlily refunded full price after 6 weeks for watt-hour issue without contest. Listing advertises 2 month warranty. So if you want to try one these, the risk is low. http://www.ebay.com/itm/G-T-Power-LCD-Display-RC-W...
by EstebanUno
Jun 23, 2015 12:27 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

What was the difference in range (Km or Miles) between 3.5V/cell and 3.2V/cell? According to that table it looks significant? The readings are from 3 different rides and routes, from full charge to nearing LVC over the total of the three. But the motor was used almost exclusively for climbing, thou...
by EstebanUno
Jun 22, 2015 6:42 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

This is assuming you took to time to know your wh of your batterys., so unless you know the wh of your battery then its no difference to using ah , except ahs is more logical and can also be used as a fuel guage. :-) Well no need to bother with a meter of any kind if you're not going to learn the e...
by EstebanUno
Jun 22, 2015 5:57 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

I ran my battery down to 3.0 V/cell under load yesterday. I didn't realize I could do this without either the BMS or the bbs02 controller shutting down. Or perhaps my understanding of what constitutes a shutoff is wrong. At the end the resting voltage was 42v. Which / 13s = 3.23 V. But watching the ...
by EstebanUno
Jun 22, 2015 5:50 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

Wh's and Ah's are both useless for predicting/estimating range ,, but Wh's is even less useless :roll: as there just are to many variables with riding environment and how you ride. Wh per mile will vary. But wh used is just what it is. Knowing your wh use enables you to estimate what's left and at ...
by EstebanUno
Jun 22, 2015 5:42 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

You don't need a meter to estimate range. All you need to know is the wh capacity of your battery and divide the wh used per mile into it. For example, I have a 888wh capacity battery. Typical wh usage for 20mph is about 21wh per mile, so 888/21=~42 miles. At 30mph, ~22 miles. and at 40mph ~10 mile...
by EstebanUno
Jun 22, 2015 2:25 pm
Forum: E-Bike General Discussion
Topic: guide on using watt meter to estimate range
Replies: 42
Views: 2893

Re: guide on using watt meter to estimate range

Why go to all the hassle of sending it back if the amp-hours reading is correct? You can calculate watt-hours in your head if you have the amp-hours. The beauty of watt-hours from the range perspective is that it adjusts to the declining voltage. 1Ah with a fully charged battery yields more watt-ho...
by EstebanUno
Jun 21, 2015 5:29 pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

Re: BBS02 number of PAS levels effect

Alfantastic, great recommendation! I tried 5 PAS levels on a long ride over challenging terrain yesterday. 46 miles, 3317 feet elevation gain. I really liked it. Big improvement over either 9 or 6 levels that I had previously tried. Below is how the levels performed from a climbing perspective. Bicy...
by EstebanUno
Jun 18, 2015 5:55 pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

Re: BBS02 number of PAS levels effect

alfantastic wrote:See my post a few posts up and give it a whirl. I guarantee you won't regret the change.
alfantastic, I just set levels to 5 for a test. I don't think I can ride until Saturday though. Will post afterwards.

Thanks,
Esteban
by EstebanUno
Jun 18, 2015 2:20 pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

Re: BBS02 number of PAS levels effect

So you want somebody else to do the searching for you? No, but someone might actually know how this works and be inclined to share that information. I've already spent a lot of time searching before posting the question, and also some time experimenting, but the effect of changing the number of lev...
by EstebanUno
Jun 16, 2015 2:50 pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

Re: BBS02 number of PAS levels effect

opperpanter wrote:... I think it's explained in the bbs02 prison thread (or the main bafang middrive thread)
LOL. The haystack thread. Not much activity there these days, so I hesitate to ask questions there. I'll try to find the needle in the haystack for the full explanation.
by EstebanUno
Jun 16, 2015 1:59 pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 number of PAS levels effect
Replies: 26
Views: 1743

BBS02 number of PAS levels effect

I'm wondering what the effect of choosing fewer than 9 PAS levels is? If one chooses say 5, does that translate into the same full power in PAS 5 as the maximum level of 9 would, with a bigger jump from level to level? Would that make level 1 of 6 somewhat equal to level 2 of 9? I'm finding in my mo...
by EstebanUno
Jun 16, 2015 12:23 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

Re: how low can you go? safe minimum voltage

OK, I'll run it to cutoff and find out and see where that falls. I have a watt meter installed so the value should be be pretty accurate. 3v x 13 =39, so I should be safe at a cutoff value of 40 or 41, whatever the bbs02 controller setting actually is. I guess I won't know who is doing the cutoff th...
by EstebanUno
Jun 15, 2015 5:35 pm
Forum: E-Bike Non-hub Motor Drives
Topic: how low can you go? safe minimum voltage
Replies: 20
Views: 4694

how low can you go? safe minimum voltage

I'm wondering how low the voltage can go without damaging the motor, controller or battery? Can I run it until the controller shuts off? Is there a built in safety cutoff? Would the bms on the battery shut down discharge at some low value as well? My primary interest is to learn what the actual usab...
by EstebanUno
May 10, 2015 12:46 pm
Forum: E-Bike Technical
Topic: how to bundle power wires from battery to controller
Replies: 12
Views: 1058

Re: how to bundle power wires from battery to controller

The wire is flexible and heat-resistant so if you're running high currents, wire in tight places, or where it gets really toasty then sure go for the premium stuff. For most of us however pretty much any wire will do as long as it's of sufficient gauge for the current loads. For your BBS02 you of c...
by EstebanUno
May 08, 2015 3:13 pm
Forum: E-Bike Technical
Topic: how to bundle power wires from battery to controller
Replies: 12
Views: 1058

Re: how to bundle power wires from battery to controller

I like to use 2 and 3 conductor black rubber jacketed cable instead of individual wires. This is what I expected to find at Hobby King (I know it's at hardware stores), and not finding it is what prompted some research, and eventually this thread. Heat shrinking the connector ends over the cable ja...
by EstebanUno
May 08, 2015 2:54 pm
Forum: E-Bike Technical
Topic: how to bundle power wires from battery to controller
Replies: 12
Views: 1058

Re: how to bundle power wires from battery to controller

I got this in 6mm: Expandable Braided Sleeving Cable Wire Harnessing Sheathing Sleeve. http://www.ebay.com/itm/331154782446?_trksid=p2057872.m2749.l2649&var=540358017347&ssPageName=STRK%3AMEBIDX%3AIT I think it is the same as the split loom, only not split. So I'll have to install while making up th...