Search found 26 matches

by Builditgood
Feb 25 2019 6:43pm
Forum: E-Bike General Discussion
Topic: Wheelies
Replies: 19
Views: 1945

Re: Wheelies

I'm practicing wheelies on a cyclone 3kw full sus that feels nicely balanced and with adequate power. Problem is the throttle is not accurate enough even though I upgraded it from the stock one. Controller isn't Bluetooth either. Any suggestions for a throttle and controller combination please , may...
by Builditgood
Apr 08 2018 5:35pm
Forum: E-Bike Technical
Topic: Basic electrical theory. Motor and controller
Replies: 5
Views: 594

Re: Basic electrical theory. Motor and controller

Brilliant explanation thanks Luke. So if I've understood it correctly the resistance of the windings is low so it is not a matter of the motor taking as much current as it needs but the controller cutting the supply when it reaches a preset limit. Based on the fact that the power of a system is dete...
by Builditgood
Apr 08 2018 2:12pm
Forum: E-Bike Technical
Topic: Basic electrical theory. Motor and controller
Replies: 5
Views: 594

Basic electrical theory. Motor and controller

Hi. A friend and me we're discussing which components govern which factors and arrived at the following. What do you folks think? The motor and it's windings have a certain resistance when cold and so draw a max current for a fixed voltage (e.g. plug a 1000W hub into a 50V battery and it will ask fo...
by Builditgood
Apr 08 2018 1:07pm
Forum: E-Bike Technical
Topic: Gear sensor gng
Replies: 2
Views: 284

Re: Gear sensor gng

Thanks Marin. Has anyone tried hacking a gear sensor or ebrake cutoff into a controller? Just wondering if it is worth the bother. Thanks again
by Builditgood
Apr 08 2018 11:57am
Forum: E-Bike Technical
Topic: Gear sensor gng
Replies: 2
Views: 284

Gear sensor gng

Hi Folks. Is it possible please to automatically cut the power when using a gng 2015 with an alfine 8 hub? Just trying to help preserve the hub's life a little. Thanks
by Builditgood
Jun 16 2017 4:02pm
Forum: E-Bike General Discussion
Topic: matching controller to hub. noob
Replies: 5
Views: 656

Re: matching controller to hub. noob

thank you very much for your input. first off wesnewell it is a spot on call with regards matching the controller to the pack. i'm going for the 30q and a 40a controller to keep it well within limits. but then the question comes, is there a 40a controller that works better with the edge 3kw compared...
by Builditgood
Jun 16 2017 7:05am
Forum: E-Bike General Discussion
Topic: matching controller to hub. noob
Replies: 5
Views: 656

matching controller to hub. noob

Hi, are some controllers better suited to some hubs and if so is it just experience that tells you what is a good match? I'm planning on putting a my edge 3000w with a 14s9p em3ev triangle pack and a ca3 with torque sensing bb. Would be nice to have regen braking but i'm concerned that it is difficu...
by Builditgood
Jan 10 2017 5:44pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Nice battery Wheazel. So the trick is to increase the number parallel of packs to get the max discharge of each cell down so that sag is negated. For lipos this appears the max discharge should be < 1/3 their c rating. I don't know if that's the same for 18650's etc.
by Builditgood
Jan 10 2017 3:12am
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Thanks ykick. Charge them up to the top it is then - minus maybe 50 millivolts for a factor of safety
by Builditgood
Jan 09 2017 5:38pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

I spoke to a mate who is into RC cars and he said there shouldn't be a problem using an under charged pack. There was no science to his answer though :?
by Builditgood
Jan 05 2017 12:34pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Thanks Dogman Dan. I hear what you're saying and it is all invaluable advice that I've taken on board but please forgive me for pushing on this one point. You said "Charging to 4v,, that's just leaving too much capacity on the table for me. I already leave a lot of it on the table at the bottom most...
by Builditgood
Jan 04 2017 2:55pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

many thanks all. it sounds like the way to design a lipo pack (so as to not over charge it and give it a better life expectancy) is to have the average cell charged to 4.15v off the charger. e.g 60v /4.15v = 14.46 cells. round it down to 14 cells so max pack voltage = 14*4.15v = 58.1v. putting anoth...
by Builditgood
Jan 04 2017 2:40am
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Thanks liveforphysics. I read somewhere that it is a good idea to put an extra cell in so the pack only ever gets charged to 90%. For example if you need a 14s build a 15s. The problem with this is it seems is that since the cells start off effectively partially discharged they are already someway a...
by Builditgood
Jan 03 2017 11:11pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Is it not a good idea to only charge them to 3.75v per cell
by Builditgood
Jan 03 2017 10:03pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Thanks. I've got a controller that requires 50a continuous and 80a peak at 60v so have paired it with 16s1p 16ah multistar lipo pack that I'll charge to 60v (rather than its max of 70v) to hopefully give some extended life. The cells are rated at 10c continuous and 20c peak so my maths tells me the ...
by Builditgood
Jan 03 2017 6:27pm
Forum: Battery Technology
Topic: What is voltage sag?
Replies: 25
Views: 5489

Re: What is voltage sag?

Sorry to resurrect this old thread but is the way of designing out voltage sag to make sure the battery pack can deliver enough current?
by Builditgood
Dec 29 2016 10:33am
Forum: E-Bike General Discussion
Topic: Help me choose the best battery!
Replies: 79
Views: 6352

Re: Help me choose the best battery!

thanks etrike. i'll look into health checking my batteries. what do you mean about alarms please - doesn't the charger cutoff when the pack is up to voltage? is it necessary to keep the drain rate down as low as 0.3c? my current build is rated at 50a continuous and 80a peak, to get 0.3c wouldn't i n...
by Builditgood
Dec 29 2016 5:10am
Forum: E-Bike General Discussion
Topic: Help me choose the best battery!
Replies: 79
Views: 6352

Re: Help me choose the best battery!

Hi Wes. I too prefer lipos for the same reasons as what you have listed but the problem I've found with my limited experience is charging. Having to do all the unplugging and changing around to put them on the balance charger is a pain. I'm currently running 14s1p lipo and might go up to 2p. I under...
by Builditgood
Dec 14 2016 5:38pm
Forum: Battery Technology
Topic: Battery List
Replies: 8
Views: 1219

Re: Battery List

Brilliant comparison. Thanks
by Builditgood
Dec 14 2016 6:01am
Forum: E-Bike General Discussion
Topic: How to get the proper advice, read before asking
Replies: 35
Views: 42824

Re: How to get the proper advice, read before asking

thanks Amberwolf. that is exactly what i was looking for
by Builditgood
Dec 11 2016 5:47pm
Forum: E-Bike General Discussion
Topic: How to get the proper advice, read before asking
Replies: 35
Views: 42824

Re: How to get the proper advice, read before asking

Thanks to everyone who posted. As a noob still figuring out whether mid is better than hub my biggest concern is whether I will fry a hub. Is there any way of working out how long it will take to overheat a hub with a rider weighing x, going up an incline of y, using a motor with a power rating of z...
by Builditgood
Nov 11 2016 7:42pm
Forum: E-Bike General Discussion
Topic: Have you owned and off roaded both hub and mid drive?
Replies: 83
Views: 7975

Re: Have you owned and off roaded both hub and mid drive?

Hello Ham. I live in Southampton and have a bike with a hub motor that you are more than welcome to ride. It is a shopper bike though so will not be a direct comparison to your tangent powered mtb. I laced the hub onto a 20inch rim and have powered it with a 14s 8ah lipo pack running through a 26a c...
by Builditgood
Oct 27 2016 4:26pm
Forum: Battery Technology
Topic: bms and spot welder
Replies: 5
Views: 885

Re: bms and spot welder

Thanks all. Have contacted Pguk and he's going to sell me a spot welder in due course. I really like the bms you are selling Circuit - the most compact I've seen - I might well be in touch shortly. Does anyone else have any recommendations of bms suppliers? Regards
by Builditgood
Oct 22 2016 5:59pm
Forum: Items for Sale - New
Topic: 6pence Resistance Spot Welder
Replies: 190
Views: 33410

Re: 6pence Resistance Spot Welder

How long did that beauty of a battery take you to weld Mudflap?
by Builditgood
Oct 21 2016 1:49am
Forum: Battery Technology
Topic: bms and spot welder
Replies: 5
Views: 885

Re: bms and spot welder

I think I've found a bms

http://bestechpower.com/518v14spcmbmspc ... 298V1.html

But i'm still surprised at how few options there seems to be out there. Some help with buying a half decent spot welder would be really appreciated.

Thanks again