Search found 7670 matches

by Alan B
Oct 12 2020 10:29am
Forum: Battery Technology
Topic: Understanding and Using EGO Power+ Batteries
Replies: 114
Views: 45150

Re: Understanding and Using EGO Power+ Batteries

Since this happens anytime the AC is unplugged or the power goes off while a battery is sitting on the charger it probably won't hurt anything. I have not tested it that I know of, but this kind of thing happens frequently with battery chargers so they are generally designed for it.
by Alan B
Oct 08 2020 10:48am
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 742
Views: 95457

Re: Active pre-charge/inrush control

Calculate the heat in the wire. 100 amps at 0.17 volts would be 17 watts of heat. If it is really continuous it could get quite hot, depending on the cooling situation.
by Alan B
Oct 08 2020 9:53am
Forum: E-Bike General Discussion
Topic: Active pre-charge/inrush control
Replies: 742
Views: 95457

Re: Active pre-charge/inrush control

Might want to check the current handling capacity of the traces.
by Alan B
Sep 15 2020 6:34pm
Forum: Battery Technology
Topic: Understanding and Using EGO Power+ Batteries
Replies: 114
Views: 45150

Re: Understanding and Using EGO Power+ Batteries

Yes, as gogo said, there is no protection on those terminals. At the very least you would want a low voltage disconnect that would cut off the tool when the battery approached the discharged voltage.
by Alan B
Sep 02 2020 5:05am
Forum: General Discussion
Topic: Garage Door Opener Installation
Replies: 5
Views: 1017

Re: Garage Door Opener Installation

Eventually I had a new door professionally installed with an opener alongside that twists the axle. Insulated, with some panels that let light in, and good seals. Totally changed the character of the garage. Best upgrade ever to the house. These days keeps the smoke out as California burns.
by Alan B
Jun 20 2020 8:25pm
Forum: E-Bike General Discussion
Topic: RadPowerBike RadCity Commuter
Replies: 153
Views: 9734

Re: RadPowerBike RadCity Commuter

I ordered an adapter cable from Bolton ebikes so we could try upgrading the battery on this RadCity without hacking up the cables, allowing it to be easily reversed. We've already upgraded the controller with the Bolton unit which helped some with hill climbing, but we wanted to try the 14 cell 52 v...
by Alan B
Jun 20 2020 7:58pm
Forum: E-Bike General Discussion
Topic: Peugeot Canyon Express Commuter
Replies: 42
Views: 5891

Re: Peugeot Canyon Express Commuter

My son is still commuting some of the time on this ebike. The new RadCity doesn't have quite the hill climbing power of the 9C. So this is still a solid commuter.
by Alan B
Jun 06 2020 2:22pm
Forum: E-Bike General Discussion
Topic: New Build with EGO 56V Home Depot Battery - Wow
Replies: 53
Views: 15654

Re: New Build with EGO 56V Home Depot Battery - Wow

Be aware that the battery controller does not appear to disconnect the battery from the terminals. The batteries I have seen photos of have direct connections from the output terminals to the pack. In order to honor the battery controller I think you must monitor the data output. So your controller'...
by Alan B
May 20 2020 12:54pm
Forum: Battery Technology
Topic: Understanding and Using EGO Power+ Batteries
Replies: 114
Views: 45150

Re: Understanding and Using EGO Power+ Batteries

Fantastic Progress.

Thanks for your effort!

Welcome to ES!!
by Alan B
Apr 16 2020 10:38am
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 170
Views: 20751

Re: One KiloWatt 18S Bulk Charger

I've heard similar things, however there are no specs or application notes for this that I'm aware of. So we don't know what the actual limits are. Too many in series will exceed the voltage limits of some components at some point. It would be ideal to find a Meanwell app note that would contain the...
by Alan B
Apr 16 2020 8:24am
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 170
Views: 20751

Re: One KiloWatt 18S Bulk Charger

Folks, there are a number of ways to do this, and the differences are subtle but can be important. Redundant connections can cause unwanted currents to flow and unwanted voltage drops or even short circuits. Either use independent floating supplies or supply outputs and allow the series connections ...
by Alan B
Apr 14 2020 11:10pm
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 170
Views: 20751

Re: One KiloWatt 18S Bulk Charger

Yes, you can do one section at a time as long as the bike system is not grounded. This thread is about three meanwells effectively in series. Works fine, as these particular meanwells are suited for battery charging. Not all Meanwells are. They need to have floating grounds and be current and voltag...
by Alan B
Apr 14 2020 7:13pm
Forum: Battery Technology
Topic: One KiloWatt 18S Bulk Charger
Replies: 170
Views: 20751

Re: One KiloWatt 18S Bulk Charger

The ground path can connect the two charger's negative leads together, shorting out the bottom 6S section.

This is only safe if the 12S charger is totally "floating", and does not have a grounded connection.

If you don't understand what all this means then don't attempt it.

Be Safe.
by Alan B
Apr 07 2020 7:06pm
Forum: Battery Technology
Topic: Understanding and Using EGO Power+ Batteries
Replies: 114
Views: 45150

Re: Understanding and Using EGO Power+ Batteries

That would be really excellent. Looking at the parts count in the BMS it doesn't appear to be a low chip count wonder. There are a lot of parts in there.
by Alan B
Mar 07 2020 11:00pm
Forum: E-Bike Technical
Topic: 60 volt vs 72 volt
Replies: 84
Views: 9619

Re: 60 volt vs 72 volt

Powervelocity Controllers use Sinusoidal Commutation, not FOC (Field Oriented Control). The Sabvoton that I have is FOC as are the PhaseRunners. There's a world of difference in the way they generate sinewaves and in the feature sets they offer. https://www.motioncontroltips.com/faq-whats-the-differ...
by Alan B
Mar 07 2020 10:45pm
Forum: Motor Technology
Topic: maxing out phase amps
Replies: 22
Views: 3557

Re: maxing out phase amps

Justin has measured saturation on a number of motors, there's an old thread on the subject. http://www.endless-sphere.com/forums/viewtopic.php?f=2&t=14494 It's hard to saturate a motor instantly due to the inductance of the winding, unless you have infinite voltage to drive it with. Justin found...
by Alan B
Mar 07 2020 9:56pm
Forum: General Discussion
Topic: World Domination, I just got my self a 3d Printer!!!
Replies: 642
Views: 78590

Topeak Trunk Risers

Sometimes we want to use a Topeak trunk with some regular saddlebags. The trunk has some small fold-out saddlebags but they aren't very large or heavy duty. Unfortunately the trunk sits too low and the saddlebags need more room to clip to the bars. So I whipped up a variation of my earlier design to...
by Alan B
Nov 15 2019 10:45am
Forum: E-Bike Non-hub Motor Drives
Topic: Diamondback OverDrive 27.5 "RidgeRunner"
Replies: 69
Views: 28056

Re: Diamondback OverDrive 27.5 "RidgeRunner"

I saw the announcement about the bridge. Very interesting.

I recall reading about Eric of Lunacycle riding across the Golden Gate bridge at night during a big storm. Quite the adventure.
by Alan B
Oct 29 2019 7:18pm
Forum: E-Bike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2606

Re: Does torque normally change with battery voltage?

Working with closed systems is so frustrating. Hence one reason most folks on ES use DIY or modified setups. I think undercharging the battery to make it last longer is silly. Use it. After several years of use replace it. Hobbling an already marginal system is not worthwhile, in my opinion. The onl...
by Alan B
Oct 29 2019 7:06pm
Forum: E-Bike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2606

Re: Does torque normally change with battery voltage?

OK no time now, will parse later see if specific answers are there to see if my understanding is better. You have to model your actual data to get specific useful predictions. Generalizations don't get you there, even if they are all correct for some situations. Well when choosing and sourcing the ...
by Alan B
Oct 29 2019 5:00pm
Forum: Battery Technology
Topic: Understanding and Using EGO Power+ Batteries
Replies: 114
Views: 45150

Re: Understanding and Using EGO Power+ Batteries

PETG is a good choice. I haven't tried TPU yet, have heard it can really bond to the PEI and create problems. PETG bonds pretty well to PEI as well, damaged one build plate that way.
by Alan B
Oct 29 2019 4:39pm
Forum: E-Bike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2606

Re: Does torque normally change with battery voltage?

You have to model your actual data to get specific useful predictions. Generalizations don't get you there, even if they are all correct for some situations. You need enough voltage to: 1) overcome back EMF for the speed you are going and have enough voltage left to both: 2) overcome resistive losse...
by Alan B
Oct 29 2019 9:41am
Forum: E-Bike General Discussion
Topic: Does torque normally change with battery voltage?
Replies: 30
Views: 2606

Re: Does torque normally change with battery voltage?

It's not like I want to climb that hill at 25km/hr. So, if back EMF limitting the current isn't the issue reducing torque, there has to be something else on my bike reducing the current at lower battery voltage. If I read all comments correctly, there is no electrical limitation that explains such ...