Endless Sphere

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.

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.

10 gauge wire is rated for about 50 amps.

https://www.engineeringtoolbox.com/wire ... d_419.html

Might want to check the current handling capacity of the traces.

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.

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.

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...

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.

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'...

Fantastic Progress.

Thanks for your effort!

Welcome to ES!!

Progress!

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...

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 ...

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...

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.

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.

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...

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...

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...

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.

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...

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 ...

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.

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...

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 ...