Endless Sphere

FWIW, the FET whose tab is connected to the pads the resistors mount on appears to be different in texture, which may simply be conformal coating, or it may be heat damage. There is a small square-looking line that may be a crack in the plastic where the smoke came out, and a round dimple between i...

If you knew what type of thermistor was designed to go there, you could add it, and the software may have the function still in there (just disabled by default), or it could be a hardware-only function, which may require other components elsewhere on the board that may or may not be populated. Inte...

Thank you both for you analysis so far. I've removed the items and have cleaned up the board as much as I could: IMG_20200624_181325.jpg There is a marking on the board near the resistors that appears to say "RT1". The resistors (or whatever they may be) are in even worse shape on the underside. One...

My burnt resistors on a ANT 320A 7S to 16S BMS from IC GOGOGO on AliExpress: IMG_20200623_165804.jpg I found an image of the same board but im not sure if it has the same current rating or if that matters: 74ca3be74665a9babb0393879f96f4b5dc6e4248_2_1380x776.jpeg According to https://www.digikey.ca/e...

I've found a photo online of the same board but I'm not sure if this has the same current rating as mine (320A, see post above) or if that even matters: 74ca3be74665a9babb0393879f96f4b5dc6e4248_2_1380x776.jpeg From that photo; I see two: Green Black Silver Gold Black resistors which equals 50.8 Ohms...

So I did this today :oops: (too much water) IMG_20200623_165804.jpg IMG_20200623_165715.jpg Its an ANT 320A 7S to 16S BMS from IC GOGOGO on AliExpress I'm going to take a stab at replacing these resistors to see if I can get it working again. I find it tricky to actually see the colours and I'm not ...

Thanks for the info so far folks. The VESC projects look fantastic! Unfortunately, it seems that 13S pack voltage is their limit. I'm running 14S. So if you already have a controller that does the 120%, you can test the theory on your MP4, before buying something new that may not do what you want. ;...

Thanks for the reply amberwolf. I'm looking for flux weakening so that I can economically get a few more rpms out of a Magic Pie 4 without increasing pack voltage or buying a different motor with a higher rpm/volt. Perhaps "flux weakening" isn't the right term that I should be using. I have sometime...

I'm on the hunt for a small (6fet sized) programmable controller sinewave controller that can do regen braking and flux/field weakening for under $60 USD. I'm planning on using 25A peak battery current and 70A peak phase current. I've looked at greentime and KT controller but it seems that they do n...

Thank you, that is an interesting problem and may be related to the issue I'm having with the temp reading. I'll have to do some troubleshooting.

A custom shaped battery might make a good case to buy your own materials/equipment.

Perhaps there is some interference from the phase cables but I would guess others would have a similar issue with any hub motor w/ a temp sensor. So far, I haven't been able to find a case like that. Unfortunately, I don't have a great electrical knowledge to know if that is even a factor.

E-brake is either d or e (low level plug or high level plug). If I recall correctly, most basic e brake cutoffs are low-level. Most hall-effect throttles use three wires, +5V, 0V and a signal wire. The extra wires on your throttle are likely for the power switch and the voltage meter all sharing a c...

"0.3C" means 0.3 multiplied by the cell's rated capacity. So if you are working with a 3000 mah cell, 0.3C is 0.3 X 3000 = 900ma

I am having a slight issue with the motor temp gauge reading "sagging" or "dropping" when I really hammer the throttle. For example lets say I hit hit open throttle and am pulling peak current from my pack, the temp gauge will appear drop around 15%. When I let off the throttle, the temp reading jum...

The new battery pack seems to be working well, even on our hottest week (so far), the BMS and two temp sensors (sitting on top the nickle strip) only went a few degrees above ambient. I decided two paint the battery box to hold the rust back. I applied some seam sealer (like rubber caulking but for ...

No problem. Do you know how many peak amps your battery pack is capable of? The general consensus is to find a BMS rated for double that so that it can run nice and cool. Be careful to check the BMS's physical dimensions though, so that it fit's in your original battery case/enclosure.

What sort of peak current do you plan on drawing from the pack? Also, both of those are available on AliExpress from the same seller for slightly less cost.

I've used a Littokala li500S and a Zanflare C4 for their "testing" capability. They both work fine but I found the "touch" function on the li500S to be a bit buggy (occasionally turns on at random). There is the regular Littokala li500 (non-touch) version as well. Be aware that these type of charges...

I would recommend a layer of rubber padding about the whole pack. That will absorb some shock. Something like this that is a fairly smooth surface: https://www.homedepot.ca/product/multy-home-all-purpose-27-inch-x-10-ft-rubber-mat-3-mm-thickness-/1000808251 You may want to insulate underneath your b...

What are the specifications of your battery pack. Is it able to supply the 18 Amps of current to the controller? It is possible the controller's low voltage cutoff is being triggered.

Damn, must have scared the crap out of you. Glad to hear you and your house are OK. Definitely a good reminder to take the time to insulate things as you go.

goatman wrote: ↑

May 25 2020 11:28am

100amp from 7p is 14a/cell, whats the volt sag?

im planning 60amp from 4p or 15a/cell max burst

I'm pulling 110A peak which is actually ~15.7A per cell. My pack resistance is about 47 milli-ohms so it sags about 5.17V at peak. Ambient Temperature around 25 C.

The battery is complete and I have been riding the bike for a few days now. Here are some photos of the build and the bike: test fitting the pack inside the battery box. I had to be very cautious since the case is conductive and I haven't fully insulated the pack yet. IMG_20200513_195746.jpg How I t...

Looks like a good bike. You spoke issue seems a bit odd. Normally a well tensioned spoke can take most abuse from a hub motor setup, even if it is 14 guage etc... I can't confirm but I'm actually surprise to read that the 1500W is "Motor Wheel Weight 15.3lbs" and the 1200W is "Motor Wheel Weight 12....